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310-813 Sun Certified MySQL 5.0 Developer Part(R) II

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310-813 exam Dumps Source : Sun Certified MySQL 5.0 Developer Part(R) II

Test Code : 310-813
Test title : Sun Certified MySQL 5.0 Developer Part(R) II
Vendor title : SUN
: 70 true Questions

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SUN SUN Sun Certified MySQL

solar Plans Open source buying Spree, Completes MySQL Deal | killexams.com true Questions and Pass4sure dumps

news

sun Plans Open supply buying Spree, Completes MySQL Deal solar Microsystems nowadays talked about it has completed its $1 billion acquisition of open supply database supplier MySQL and may circulate aggressively to purchase other open supply carriers.

whereas no selected aims were stated, sun President and CEO Jonathan Schwartz stated the MySQL acquisition may subsist a key fraction in solar's exertion to transform itself into a key provider of open source utility.

"Open source is definitely within the DNA of sun," Schwartz said. "As such, once they appear to subsist across the market, these corporations that acquire constructed good, high-integrity communities and acquire big distribution and a few measure of commercial success are the ones we're going to subsist most attracted to."

just ultimate week, sun introduced the completion of an extra open supply vendor, Innotek, whose VirtualBox desktop virtualization platform works cross-customer operating techniques.

"there may subsist a transforming into number of totally spellbinding and totally resourceful open supply organizations available and they trust they are a herbal domestic for lots of them and we're actually going to subsist placing their stability sheet to labor to head construct that the case," Schwartz referred to.

regardless of sun's moves to situation itself as a key open source issuer by pass of OpenSolaris, Java, NetBeans and its GlassFish software server residences, traffic officials stated gaining MySQL will let solar tap into MySQL's stated 11 million subscribers whereas giving credence to MySQL as an option database platform to traffic shoppers.

"MySQL is among the most profitable manufacturers in the free and open source exquisite world," mentioned wealthy green, government vp of solar's application company. "This combination strengthens solar's position because the greatest contributor to the open supply neighborhood and offers solar a dramatically more desirable attain."

sun first introduced its intent to acquire MySQL in mid-January and spoke of both organizations moved directly to near the deal. MySQL CEO Marten Mickos will reside on with solar as senior vice chairman of the enterprise's unique database neighborhood.

solar furthermore moved without detain to transition the MySQL product line. The traffic talked about clients can download the database freed from saturate perquisite here. commercial enterprise consumers can now subscribe to MySQL's complete product line. sun referred to it's offering crucible subscriptions freed from can charge.

The company additionally launched MySQL enterprise unlimited , a subscription-based provider for the deployment and management of any variety of MySQL traffic Servers.

concerning the writer

Jeffrey Schwartz is editor of Redmond journal and furthermore covers cloud computing for Virtualization overview's Cloud report. moreover, he writes the Channeling the Cloud column for Redmond Channel partner. supervene him on Twitter @JeffreySchwartz.


sun Basket offers Meal Kits in keeping with American melanoma Society instructions | killexams.com true Questions and Pass4sure dumps

published: Mon, November 5, 2018 1:27 PM

solar Basket has launched meal kits that meet the American cancer Society's dietary guidelines. The company says the ACS recommends a eating regimen lofty in greens, fruits, entire grains, and rawboned proteins however low in purple and processed meat. sun Basket is offering plant-forward vegan, vegetarian, and pescatarian plans for those seeking to consume by pass of these requisites.

govt Chef Justine Kelly, the former head chef on the Slanted Door, a James Beard Award-winning restaurant, created the plans, which proffer nutritionally balanced nutrition with globally impressed flavors. And the products are made with organic succumb and spotless materials.

The enterprise notes that here's one of a brace of health-oriented improvements. different initiatives consist of partnering with the American Diabetes affiliation on a diabetes-pleasant meal scheme and offering coronary heart-determine licensed recipes that meet American coronary heart association requisites. 

linked: sun Basket Opens Distribution headquarters in a Missouri Cave; sun Basket Opens unique Distribution center.

NewsOK has disabled the comments for this article.


Renesas Electronics Sub-Gigahertz instant solution selected as yardstick quest at various bed Unit for Wi-solar FAN | killexams.com true Questions and Pass4sure dumps

with the aid of Ken Briodagh November 07, 2018

based on a simultaneous announcement, Wi-sun Alliance has adopted the Renesas Electronics supplier, a employer of superior semiconductor options, sub-gigahertz (Sub-G) instant reply as a candidate of the interoperability verify mattress units (TBUs) for the Wi-sun FAN (container region network) Certification program.

Renesas is a component of the primary wave of groups taking fraction in the Wi-solar FAN 1.0 certification mode with its RAA604S00/RX651 instant solution. Certifications are deliberate by means of the quit of 2018.

The Sub-G instant solution points Tessera technology’s contrast platform, which contains an assessment board3 hooked up with Renesas’ RAA604S00 instant communications device-on-chip (SoC) and RX651 microcontroller (MCU), in addition to communication control software offered through Renesas. Renesas will account for the unique Sub-G instant reply at its booth (stand B.c44) at European Utility Week 2018, November 6 to November eight, in Vienna, Austria.

“The Wi-sun neighborhood has been making big strides within the edifice and deployment of instant communications in the energy administration programs trade, and they are pleased to expand their commitment to the sage energy markets and boost the newest Wi-solar requirements with their Wi-sun FAN-licensed reply and test mattress units,” mentioned Akihiro Kuroda, VP, power Infrastructure enterprise Division, Renesas Electronics company.

The Sub-G corps offers elements which are resilient to physical limitations and might transmit facts even further than supported by using past specifications, even in city environments. considering broad areas may furthermore subsist covered with respectable steadiness via mesh networks, it is acceptable for applications such sensible meter conversation, energy utilization visualization, monitoring device utilization, and managing quite a lot of sensors inside a utility, factories and structures.

The IoT Evolution Expo, and collocated hobbies, IoT Evolution fitness, LPWAN Expo, The sage metropolis event, and IIoT convention, will hold location Jan. 29 to Feb 1 in ft. Lauderdale, Florida. talk over with IoTEvolutionExpo.com to register now.

Edited via Ken Briodagh

author data

Editorial Director


310-813 Sun Certified MySQL 5.0 Developer Part(R) II

Study sheperd Prepared by Killexams.com SUN Dumps Experts


Killexams.com 310-813 Dumps and true Questions

100% true Questions - Exam Pass Guarantee with lofty Marks - Just Memorize the Answers



310-813 exam Dumps Source : Sun Certified MySQL 5.0 Developer Part(R) II

Test Code : 310-813
Test title : Sun Certified MySQL 5.0 Developer Part(R) II
Vendor title : SUN
: 70 true Questions

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My buddies informed me I ought to signify on killexams.com for 310-813 examination coaching, and this time I did. The brain dumps are very handy to apply, i actually affection how they may subsist installation. The question order facilitates you memorize things higher. I passedwith 89% marks.


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discovered an accurate source for actual 310-813 present day dumps.
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Get 310-813 certified with actual hold a quest at question financial institution.
I passed the 310-813 exam thanks to this bundle. The questions are accurate, and so are the topics and study guides. The format is very convenient and allows you to study in different formats - practicing on the testing engine, reading PDFs and printouts, so you can labor out the style and equilibrium thats perquisite for you. I personally loved practicing on the testing engine. It fully simulates the exam, which is especially Important for 310-813 exam, with everyone their specific question types. So, its a resilient yet trustworthy pass to obtain your 310-813 certification. Ill subsist using killexams.com for my next smooth certification exams, too.


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Sun Certified MySQL 5.0 Developer Part(R) II

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Exploring Enums: The Wait Is Finally Over | killexams.com true questions and Pass4sure dumps

To enumerate means to itemize or to list. In the world of programming, enumerations, enums for short, are used to limn a finite set of values (constants) that a variable can attain. In other words, it defines the domain of a type. For instance, different states of a fan switch - off, low, medium, and lofty - construct up an enumeration.

Since the first release of Java, programmers acquire been complaining about the necessity of core language back for enumerated types. After all, Java improvised on the shortcomings of C++ and touted kind safety, so it was only natural for the developer community to anticipate back for a moral enum-type. During what seemed affection an eternally long wait, many ad-hoc enum representations evolved and most of them shared a common premise - modeling enumerations based on a primitive type, usually an int; descry Listing 1 for an example.

Although practical, such implementations acquire long been frowned upon by Java purists as a hack that can best subsist described as brittle. What exactly is wrong with such an implementation? In essence, the main detriment of faking enumerated types using primitives is the necessity of stalwart typing and hence the inability to tangle errors at compile time. Other shortcomings are less readable code, deviations from object-oriented concepts such as encapsulation, the absence of a namespace requiring an express prefix for everyone references, and the dangers of exposing the internal implementation to client code.

Let's quest at some of these drawbacks in more detail.

Loose kind checking is the result of a compiler treating the faked enumeration just affection any other primitive variable. Since the compiler doesn't know anything about the cohesiveness of the enumeration of constant values, it doesn't catch, for instance, a definitive assignment of an out of ambit value. In other words, necessity of an express kind totally gives away the benefits of compile-time mistake detection.

Such ad hoc approaches violate some of the basic object-oriented principles. In the previous example, the states of the switch necessity encapsulation. Attributes representing the constants and operations are not grouped together but are scattered within the enclosing scope. Since the client code is well conscious of implementation details, even a minuscule change such as renumbering them might result in broken client code. furthermore note the necessity of express scoping. Since enum attributes are listed along with other class attributes, the enclosing scope is often that of the declaring class or interface. This makes their grouping vague, unreadable, and sometimes mistake prone.

In his book effective Java, Joshua Bloch presents a pattern for type-safe enums that offers both compile-time safety and better encapsulation. java.awt.Color uses a similar strategy to mask the int-enum implementation under the sheet. However, after reading through pages replete of Java code, you inaugurate to miracle if the juice is worth the squeeze. It only reinforces the necessity for core language back for enum types. For a language that touts kind safety, the strategy of faking enums with such intricate pyrotechnics seems rather odd.

Enter the unique EnumThe wait is finally over and moral enums are here. Enums are a kind of their own in J2SE 5.0. Among many other developer-friendly features recommended in JSR 176, Tiger (the code title for the unique release) packs the powerful punch of type-safe enums. Listing 2 shows how they rewrite Fan.java using moral enums. (Listings 2-9 can subsist downloaded from www.sys-con.com/java/sourcec.cfm.)

Note the unique enum keyword introduced to back the unique kind and furthermore how enumerated constants are listed - they are neither strings nor ints but belong to their own declared type, i.e., SwitchState. Because it's a moral type, everyone the benefits of stalwart typing automatically kick in. For instance, the following code attempting to set an invalid state

new Fan().setState(6);

is automatically detected at compile time and reported an error, eliminating the necessity for several lines of validation code:

setState(Fan.SwitchState) in Fan cannot subsist applied to (int)

Let's quest at other useful features provided by the enum type.

Support for NamespaceIn the previous example, everyone the listed constants, e.g., states of the fan switch, implicitly belong to the enclosing type, appropriately named SwitchState, requiring an express namespace qualification to everyone references to states. For example:

SwitchState.Low

Namespace adornment furthermore helps avoid collisions. If they were to declare another enum kind for class Fan using a similar set of constants, say:

public enum DurabilityRating { Low, Medium, lofty }

it will result in no title collision. SwitchState.Low can subsist distinguished from DurabilityRating.Low because of their enclosing scope.

Since enum SwitchState is declared as public, and with the kind system providing a namespace for each enum constant, it can subsist accessed outside the scope of class Fan just affection any timehonored ascribe reference, e.g., Fan.SwitchState.Medium.

Auto Conversion to String ValuesThe unique enum kind easily facilitates descriptive printing using an internal implementation of the toString() method. The default implementation returns a string representation of the constant as declared, and, if you don't affection it, it can subsist changed by overriding toString(). It's that simple.

Works with Programming ConstructsSince enums are their own types, some of the yardstick Java constructs, notably the switch and for statements, acquire been enhanced to labor with enum types. Listing 3 provides an case of the switch construct.

Switch statements are useful for simulating the addition of a mode to an enum kind from outside the type. This can subsist very useful if for some reason the enum definition cannot subsist modified, but needs to subsist extended.

There is something rather spellbinding about this switch statement - note how the enum constants in case statements issue bare, e.g., unqualified with their namespace. J2SE 5.0 makes life easier by attempting to resolve identifiers in the immediate context. This is a bit similar to the unique static imports feature. In this example, however, you are required to omit the namespace. Try including it and you'll find an mistake message:

Fan.java:16: an enum switch case label must subsist the unqualified title of an enumeration constant case SwitchState.Off : recrudesce SwitchState.Low ;

Listing 4 provides an case that uses a for-loop construct to iterate through enums.

The values() mode returns an array that contains enum constants for this enum in the order in which they are declared. By the way, the for-loop shown here is called "enhanced for-loop", another spotless feature in the unique release. They are furthermore called as "for-in loop" since you read them as "for-state-in-Switchstate.values". This unique construct simplifies iterating over a collection of values - both arrays and Java collections - by taking away the necessity to inspect the size, utilize a temporary index variable, and cast each constituent to the arrogate type.

Looking Under the HoodIn the spirit of empiricism, let's quest under the hood and descry how enums are implemented. Compiling Fan.java (for the complete source code descry the resources section) generates two .classes: Fan.class and Fan$SwitchState.class. The latter contains their enum definition.

D:\MyJava\JDJ\src>javap Fan$SwitchState Compiled from "Fan.java" public final class Fan$SwitchState extends java.lang.Enum{ public static final Fan$SwitchState Off; public static final Fan$SwitchState Low; public static final Fan$SwitchState Medium; public static final Fan$SwitchState High; public static final Fan$SwitchState[] values(); public static Fan$SwitchState valueOf(java.lang.String); static {}; }

As you can see, the process of compilation results in the automatic generation of a unique class that extends java.lang.Enum. In other words, the enum keyword acts as a shorthand representation for the autogenerated class. This is what the authors of JSR 201 meant by "linguistic back for type-safe enumeration pattern." It's worth mentioning that every unique language extension introduced in Java 5.0 is implemented by modifying the source-to-byte code compiler so the JVM implementation remains unchanged.

If you notice the naming convention adopted for generated enum types, you'll recognize that they closely resemble the inner class syntax, e.g., <enclosingType>$<thisType> format. everyone enum classes are final subclasses of java.lang.Enum, serializable, and comparable. They promote with predefined toString, hashCode, and equals methods. everyone methods except toString are final.

Note that everyone enlisted enum constants are represented as final self-type variables of the class. This is done to ensure no instances exist other than those in the generated class. In other words, enums are Singletons and, for the same reason, they can't subsist instantiated using unique or cloned. The clone mode in java.lang.Enum throws a CloneNotSupportedException.

Since enums are compiled into their own class files, their definition can subsist changed, e.g., enum constants can subsist added, deleted, and reordered without having to recompile the clients. If you removed an enum constant that a client is using, you'll fail quick with an mistake message.

Now let's quest at some advanced features.

Flavors of DeclarationEnums can subsist declared in various flavors. The enum FanState above is an case of an inline declaration. These are useful for defining enums that acquire a limited scope - the utilize and throw kind of enums. Since Java 5.0 introduces the keyword enum at the same smooth as class and interface keywords, enums can subsist declared just as you would a unique class or an interface - in its own .java file (see Listing 5).

Normal rules of access visibility that apply to standalone Java classes furthermore apply to enums, whether they are declared inline or in a part file. For example, if you omitted the public keyword, the enum kind will acquire the default package visibility and hence subsist accessible only within the package. Similarly if the SwitchState enum were to acquire a private access specifier, it wouldn't subsist accessible outside the class scope of Fan. You find the point.

As with other unique features introduced in Java 5.0 such as generics, enums acquire been used in several JDK packages. JDK 5.0 includes several enum types to back core classes. For instance, the newly introduced java.lang.Thread class uses an enum named state to limn the current state of the thread. Some of the best enum candidates haven't been converted over yet - affection the most quoted Color class. You can utilize Javadoc as your sphere sheperd for spotting enums in Tigerland. The unique API Javadoc conveniently lists everyone enums in the package-summary.html along with other top-level types. Once you acquire spotted them, evanesce ahead and open the source code and descry how the preachers practice. It's always fun.

Class-like BehaviorSince enums are class-like critters, they back most, if not everyone (see the Caveat Emptor sidebar), semantics supported by timehonored Java classes. The enum kind definition can acquire one or more parameterized constructors, implement interfaces, and back class corpse elements such as attributes, methods, instance and static initializer blocks, and even inner classes.

In addition, arbitrary fields and methods can subsist added to individual enum constants. Such constant-specific class bodies define anonymous classes inside enum classes that extend the enclosing enum class. Listings 6-9 illustrate the utilize of some of these features.

There's a lot to digest here, so let's tackle them one at a time.

We are defining three types of accounts as enums - checking, savings, and investment. First things first - they necessity some clarification of terminology here. Every enum constant has a declaring class, which is furthermore called its type. The term "enum type" is used to mention to the declaring class, e.g., AccountType. When they utilize the term "enum constant", it's referring to everyone enlisted contents contained in the scope of AccountType, e.g., Checking, Savings, and Investment. It shouldn't subsist very confusing. Just contemplate of any class declaration and its objects - the enum kind is analogous to the class declaration and enum constants, the objects.

Enums Are ClassesSimilarities between a timehonored class declaration and an enum declaration are arduous to miss. The enum kind AccountType implements the IAccountType interface and has two constructors. What does it mean? To implement an interface, the enum kind must implement every mode defined in the interface. Since everyone enum constants are objects of the declared type, they partake the common implementation of methods getAvgBalanceMethod and getInterest- Rate. An enum constant declaration, when followed by arguments, invokes the constructor defined by the enum type. In their example, the enum constant Savings invokes the constructor

AccountType(double interestRate)

with dispute 3.5.

All the yardstick rules of constructor overloading and selection specified by the Java Language Specification are followed here. Since enum constant Checking has no arguments following its declaration, it's necessary to provide a no-arg default constructor. If the enum class has no constructor declarations, a parameterless default constructor is automatically provided to match the implicit vacuous dispute list.

Notice how an enum kind can declare methods and attributes, again, just affection a timehonored Java class. For member kind declaration, everyone rules of scoping, access specifiers, and visibility are sound and therefore must subsist followed with respect to instance variables and methods. There is something rather spellbinding with the kind AvgBalanceMethod. It's an enum within an enum. Since an enum kind can back everyone types of class members, they can back enums too. Since AvgBalanceMethod is declared as public, it's visible outside the scope of the enclosing AccountType. Notice how it's accessed in the Account class.

Constant Class BodiesEnum constants can subsist associated with an arbitrary class corpse often referred to as a constant class body. Such classes are very similar to anonymous class declarations (even named similarly) and are implicitly static. This means they can access only static defined in the enclosing scope. Since constant classes are implicit extensions of the enclosing class, they can override methods defined in the enum type. In their example, enum constant Investment overrides getAvgBalanceMethod defined by AccountType. In fact, it would subsist perfectly legal to declare AccountType as abstract and oblige every enlisted enum constant to implement methods in the interface in their constant class body. A word of caution: although back for constant class bodies is a very powerful feature, it may subsist sage to avoid stretching them because of the same reasons why inordinate utilize of anonymous classes is discouraged - they are less readable and arduous to debug.

It's Important to mention here that only a nonfinal instance mode in java.lang.Enum is the toString() method. You can override and implement the per-constant toString() mode to recrudesce a descriptive title for each enum constant. The default implementation of toString() returns just the string equivalent of the constant. Therefore, as illustrated in the example, it may subsist a profitable strategy to override when a more descriptive literal is necessary.

Before they proclaim victory, two unique classes introduced for enum back deserve consideration: java.util.EnumMap and java.util.EnumSet. As their names suggest, they are enum-enabled counterparts of the yardstick Java collection implementation. They both require that each constituent maintained by the collection belong to one enum type. In short, they won't let you merge and match enum constants from different types. It's rather spellbinding that they both retain the elements, e.g., the enum constants, in their declared order, totally ignoring any custom implementation of the compareTo() method. subsist sure to check out their API documentation.

ConclusionThe unique enums are a robust pass to implement constant named lists and construct them a compelling alternative to ad hoc enum implementations. With class-like deportment and the skill to back arbitrary class members, they are certainly bigger than they appear. Although you may not acquire an immediate necessity to utilize them in your projects, or at least not every feature they offer, withhold them in your toolbox and you'll soon find them handy.

Resources

  • Java 5.0 Release candidate home page: http://java.sun.com/j2se/1.5.0/index.jsp
  • JSR 201 - check out the enum draft spec: http://jcp.org/en/jsr/detail?id=201
  • JSR 176 - J2SE 5.0 Release contents: http://jcp.org/en/jsr/detail?id=176

    SIDEBAR

    CAVEAT EMPTORLet the buyer beware: a simple axiom often used in commerce summarizes it well - it means the buyer alone is liable for assessing the attribute of a purchase before buying. Enums are so powerful, once you learn the ropes it's effortless to subsist tempted to stretch and accomplish "cool" things. Before you know it, groundwork things start happening.

    Always check out the API spec and know the expected deportment before you situation something to use. As a smart programmer, you furthermore necessity to know the limitations of the enums so that it can save your bacon some day.

    1.  You can't unique enums: recall they are singletons. For the JVM to ply them properly, only one instance of each should exist. They are automatically created for you. Luckily the compiler catches express instantiation. For the same reason, enum constructors are implicitly private. contemplate about it.

    2.  You can't extend enums: One enum cannot extend another one. You can't extend the primordial java.lang.Enum either. That's how it works and if you are worried about this limitation, your design demands a second look. You shouldn't necessity a hierarchy of enums.

    3.  You can't declare enums locally: Enum types cannot exist in any scope lower than a class scope. You can't define them within a method.

    4.  Order matters: Within the enum kind class body, the constants must issue before other class elements such as attributes, methods, and constructors. This is moral at least as of the 5.0 beta release.

    5.  No nulls please: An enum constant cannot subsist null. It's that simple.

    6.  Don't utilize ordinal: Code that uses an ordinal() method, e.g., logic based on the position of an enum constant as it appears in the declaration, must subsist discouraged. Your code will shatter at runtime if constants are subsequently reordered. What's more, this is a runtime error. The compiler will not tangle such a thing.

    7.  Everything that sounds the same, isn't: There are a few other classes in JDK 5.0 that sound very similar - Enumeration, EnumControl, to title a few. Don't assume they are enum implementations. Check the Javadoc.

    8.  Spare the serialization: Enum serialization isn't affection the timehonored one you acquire seen. The process by which enum constants are serialized cannot subsist customized. Any class-specific writeObject and writeReplace methods defined by enum types are ignored during serialization. Similarly, any serialPersistentFields or serialVersionUID sphere declarations are furthermore ignored - everyone enum types acquire a fixed serialVersionUID of 0L. Again, this shouldn't concern you too much. Let the language hold trust of the specifics.


  • Use the Ruby on Rails Alternative | killexams.com true questions and Pass4sure dumps

    In-Depth

    Use the Ruby on Rails Alternative

    Take a more expedient approach for developing MVC Web applications than you might hold using J2EE technologies.

  • By Deepak Vohra
  • 03/07/2007
  • Ruby on Rails is an open source Web framework for developing Model-View-Controller (MVC) Web applications that access databases. Ruby on Rails is based on the object-oriented Ruby scripting language. The model class in a Ruby on Rails application specifies the data model. A connection with the database is obtained in the model class, and the database table from which data is to subsist retrieved is specified. The controller class specifies the actions (methods) that accommodate the traffic logic to process data, and the view templates are the user interfaces (UIs) for the MVC application. Controller class methods are invoked from a view template, the controller class processes data using the model class, and it renders a view template or invokes another controller method.

    Ruby on Rails doesn't require configuration files as does a Java 2 Platform, Enterprise Edition (J2EE) application. Ruby on Rails requires a Web server and a database, and it includes the WEBrick Web server. It is furthermore preconfigured with the MySQL database. Let's quest at how to utilize Ruby on Rails to develop a Create-Read-Update-Delete (CRUD) application. A CRUD application is used essentially to create, manipulate, and delete database table entries.

    Because a Rails application is of the MVC pattern, the model and controller classes are Ruby classes (.rb files). The model class models data and extends the ActionRecord::Base class. Models provide object-relational mapping (ORM) between traffic objects and the database. The view templates are the UIs of a Ruby on Rails application and are represented with .rhtml or .rxml files. An RHTML view template is the more commonly used alternative and is Ruby-embedded HTML. The controller class extends the ActionController::Base class and specifies actions (methods) to process data. Ruby on Rails provides various commands to generate a Rails application and model and controller classes. Some Ruby on Rails commands are listed in Table 1.

    Get On TrackBegin by installing Ruby on Rails and including RubyGems, the yardstick package manager used with Ruby applications and libraries. Here is the procedure to install Ruby on Rails:

  • Download the Ruby Windows Installer application by double-clicking the ruby185-21.exe application to start the Ruby Setup Wizard. Click Next, and read and accept the license agreement.
  • Select the default components to install, which comprehend the RubyGems package manager, and click Next.
  • Specify a directory to install Ruby (the default is c:/ruby), and click Next.
  • Choose a Start Menu folder, and click Install to install Ruby and RubyGems.
  • Install Rails by using the CD (change directory) command to construct c:/ruby the current directory, and then Run this command to install Rails and its dependencies—note that the activerecord package implements the model layer of a Rails MVC application, and the actionpack package implements the view and controller: gem install rails --include- dependencies
  • Use Setup.exe to download and install MySQL 5.0, and create a MySQL Server instance.
  • Now let's create a Ruby on Rails application that represents a journal catalog. utilize the rails command on the command line to create a Ruby on Rails application in the catalog directory from within the ruby directory:

    rails catalog

    The app directory contains the subdirectories controllers, models, and view for the controller classes, model classes, and view templates, respectively. The config directory contains the database.yml file in which the database configuration is specified. A Rails application may subsist Run in evolution (the default mode), test, or production mode.

    For the case here let's Run the Rails application in evolution mode. Modify the evolution mode settings in the database.yml file to specify the database as mysql. The evolution mode settings for the MySQL database should quest affection this:

    development: adapter: mysql database: test username: root password: mysql host: localhost

    The db directory is used for migration scripts, which will subsist discussed shortly.

    Now they necessity to create a database table that will utilize ActiveRecord migrations. A migration class extends the ActiveRecord::Migration class and is Run with the rake command. The rake command is similar to Ant's build utensil for creating J2EE applications. A migration script gets created when a model class script is created. Create a model script with this command in the Ruby Console Window from the ruby/catalog directory:

    ruby script/generate model catalog

    The model class catalog.rb is created in the app/models directory, and the migration script 001_create_catalogs.rb is created in the db/migrate directory. The migration script class, CreateCatalogs, extends the ActiveRecord::Migration class:

    class CreateCatalogs < ActiveRecord::Migration def self.up create_table :catalogs accomplish |t| # t.column :name, :string end end def self.down drop_table :catalogs end end

    The default migration script consists of the methods self.up and self.down. The self.up mode is invoked to Run a migration and create a database table. utilize the create_table transformation of the ActiveRecord::Migration class to create a database table called catalogs. ActiveRecord uses pluralization to map a model class to a database table. The model class is singular and uppercase, and the database table is plural and lowercase.

    In the Ruby on Rails application case the model class is Catalog and the database table is catalogs. The ActiveRecord::Migration class provides various transformations for a database. Some of the transformations are listed in Table 2.

    Modify the migration script 001_create_catalogs.rb to create a database table, and then add data to the table. In the create_table transformation create a table called catalogs with the columns journal, publisher, edition, title, and author:

    create_table :catalogs accomplish |t| t.column :journal, :string, :limit => 255 t.column :publisher, :string, :limit => 255 t.column :edition, :string, :limit => 255 t.column :title, :string, :limit => 255 t.column :author, :string, :limit => 255 end

    Valid column types are integer, float, datetime, date, timestamp, time, text, string binary, and boolean. sound column options are limit, default, and null.

    Next, add data to the table with the ActiveRecord::Base class method, create, to add a table row:

    Catalog.create :journal => "developerWorks", :publisher => "IBM", :edition => "September 2006", :title=> "A PHP V5 migration guide", :author=>"Jack D. Herrington"

    Listing 1 shows the complete migration script. Run the migration with the rake command from the /ruby/catalog directory. Rails has a target called migrate to Run migrations:

    rake db:migrate

    The catalogs database table is created in the MySQL database named mysql. The catalogs table has a primary key sphere of kind int(11) and the auto_increment attribute, which generates a unique identity for unique rows.

    Develop a CRUD ApplicationBefore they develop a Ruby on Rails CRUD application, note that a Ruby on Rails application consists of these Ruby scripts and view templates:

  • Model class in the app/models directory
  • Controller class in the app/controllers directory
  • View templates (RHTML files) in the app/views directory
  • Previously they created a model class Ruby script. They utilize an interface to create unique entries in the database, retrieve entries, update entries, and delete entries. The interface to the data in the database is scaffolding. Scaffolding consists of controller and model Ruby classes and view templates. Rails provides two types of scaffolding, dynamic scaffolding and scaffolding created with the ScaffoldGenerator. You can create a dynamic scaffolding by adding this scaffold mode invocation to the controller class:

    scaffold :modelname

    The scaffold mode generates controller logic and view templates dynamically using a model class obtained with Rails naming conventions. The first epistle of the modelname is uppercase to obtain the model class. For example, if the modelname specified in the scaffold mode is catalog, the Catalog model class is used in the scaffolding.

    Instance variables @catalog/@catalogs are used in the controller class; controller instance variables are furthermore available in the view templates. The Rails framework provides the scaffold generator to create a controller class, a model class, and the scaffolding for a CRUD application. Scaffolding generated with the ScaffoldGenerator is similar to the one generated with the scaffold method, except that the controller logic and view templates are generated when the ScaffoldGenerator command is Run instead of being generated dynamically. In the Ruby console window Run the scaffold generator:

    ruby script/generate scaffold catalog

    This command generates a model class, a controller class, and the view templates index.rhtml, list.rhtml, show.rhtml, new.rhtml, create.rhtml, edit.rhtml, update.rhtml, and destroy.rhtml. The Catalog model class looks affection this:

    class Catalog > ActiveRecord::Base end

    Listing 2 shows the controller class CatalogsController.

    With the scaffolding these actions (methods) are generated in the controller class: index, list, show, new, create, edit, update, and destroy. The default view templates may subsist overridden with view templates in the views directory. For example, a custom view template edit.rhtml can subsist provided in the views/catalog directory.

    Next, let's Run the Ruby on Rails application in the WEBrick Web server. inaugurate by starting the WEBrick server from the /ruby/catalog directory:

    ruby script/server

    Access the WEBrick Web server with the URL, http://localhost:3000 (see motif 1). panoply the list of catalog entries with the list view template, which is invoked with the URL, http://localhost:3000/catalogs/list. To create a unique catalog entry click the unique catalog link (see motif 2). In the unique view template add a catalog entry, and click the Create button. A unique catalog entry is added in the list view template. Click the account for link to account for a catalog entry. To delete a catalog entry click the execute link, and to edit a catalog entry click the Edit link (see motif 3).

    Use the edit view template to modify the catalog entry; for example, modify the title and click the Edit button to update the catalog entry (see motif 4).

    Ruby on Rails is simpler than J2EE for developing MVC Web applications. The JavaServer Pages (JSP), HTML, servlets, Enterprise JavaBeans (EJB), and configuration fields that are required in a J2EE application are not required for a Ruby on Rails application.

    About the Author

    Deepak Vohra, a Sun-certified Java programmer and Sun-certified Web component developer, has published numerous articles in industry publications and journals. Deepak is the author of the book "Ruby on Rails for PHP and Java Developers."


    Anatomy of a Java Finalizer | killexams.com true questions and Pass4sure dumps

    A brace of patterns that could cause Java heap exhaustion were identified from years of research at IBM. One spellbinding scenario was observed when Java applications generated an inordinate amount of finalizable objects whose classes had non-trivial Java finalizers.

    What Is a Java Finalizer?A Java finalizer performs finalization tasks for an object. It's the opposite of a Java constructor, which creates and initializes an instance of a Java class. A Java finalizer can subsist used to effect postmortem cleanup tasks on an instance of a class or to release system resources such as file descriptors or network socket connections when an expostulate is no longer needed and those resources acquire to subsist released for other objects. You don't necessity any dispute or any recrudesce value for a finalizer. Unfortunately the current Java language specification does not define any finalizers for a Java class or interface when a class or interface is unloaded. Let's hold a closer quest at finalize() mode of java.lang.Object that provides an instance method, finalize() for finalization:

    protected void finalize() throws Throwable

    When a Java expostulate is no longer needed, the space occupied by the expostulate is supposititious to subsist recycled automatically by the Java garbage collector. This is one of the significant differences in Java and is not organize in most structural programming languages affection C. If an instance of a class implements the finalize() method, its space cannot subsist recycled by the garbage collector in a timely fashion. Worst case, it may not subsist recycled at all.

    Any instances of classes that implement the finalize() mode are often called finalizable objects. They will not subsist immediately reclaimed by the Java garbage collector when they are no longer referenced. Instead, the Java garbage collector appends the objects to a special queue for the finalization process. Usually it's performed by a special thread called a "Reference Handler" on some Java Virtual Machines. During this finalization process, the "Finalizer" thread will execute each finalize() mode of the objects. Only after successful completion of the finalize() mode will an expostulate subsist handed over for Java garbage collection to find its space reclaimed by "future" garbage collection. I did not speak "current," which means at least two garbage collection cycles are required to reclaim the finalizable object. Sounds affection it has some overhead? You got it. They necessity several shots to find the space recycled.

    Finalizer threads are not given maximum priorities on systems. If a "Finalizer" thread cannot withhold up with the rate at which higher priority threads cause finalizable objects to subsist queued, the finalizer queue will withhold growing and cause the Java heap to fill up. Eventually the Java heap will find exhausted and a java.lang.OutOfMemoryError will subsist thrown.

    A Java Virtual Machine will never invoke the finalize() mode more than once for any object. If there's any exception thrown by the finalize() method, the finalization of the expostulate is halted.

    You are free to accomplish virtually anything in the finalize() mode of your class. When you accomplish that, gratify accomplish not anticipate the recollection space occupied by each and every expostulate to subsist reclaimed by the Java garbage collector when the expostulate is no longer referenced or no longer needed. Why? It is not guaranteed that the finalize() mode will complete the execution in timely manner. Worst case, it may not subsist even invoked even when there are no more references to the object. That means it's not guaranteed that any objects that acquire a finalize() mode are garbage collected. That's a potential hazard from a recollection management perspective and, needless to say, there is considerable overhead for queuing, dequeuing, running the finalize() method, and rescanning the expostulate in the next garbage collection cycle.

    If you want to Run cleanup tasks on objects, consider finalizers as a last apply and implement your own cleanup method, which will subsist more predictable. It's very risky to depend on finalizers for postmortem cleanup tasks, especially if your finalizable objects acquire references to indigenous resources.

    Hands-on suffer with Java FinalizerWe can easily simulate this scenario with a brace of test applications and hold a quest at dumps and traces to descry what's happening inside of the Java heap and threads for hands-on experience.

    Let's build a brace of Java classes to recreate typical scenarios.

    In ObjectWYieldFinalizer, they can implement the mode finalize() with Thread.yield() so that finalize() cannot complete its execution (see Listing 1) (Listings 1-7 can subsist downloaded here.)

    The Thread.yield() mode prevents the currently executing thread from running and allows other threads to execute. If the Finalizer thread calls this finalize() method, it will respite its execution.

    In ObjectWExceptionFinalizer, the finalizer() mode immediately throws a java.lang.IndexOutOfBoundsException. If the Finalizer thread calls this finalize() method, the expostulate finalization won't subsist completed because of the exception and there's no second random to Run the finalize() mode (see Listing 2).

    In ObjectWEmptyFinalizer, they don't implement any code in the finalize() mode (see Listing 3). ObjectWOFinalizer doesn't acquire any finalize() mode (see Listing 4).

    Let's Run each of the classes to descry what happens. Sun's Java Virtual Machine (JVM) can subsist used with the following options for the class TestObjectWYieldFinalizer.

    /sun1.6.0_10/bin/java -Xmx50m -verbosegc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC -XX:+HeapDumpOnOutOfMemoryError TestObjectWYieldFinalizer > verbosegc.txt

    It looks very complicated. Why accomplish they necessity those command-line options? Well, without those options, they only find a runt information about Java garbage collection activities affection this:

    [Full GC 50815K->45644K(50816K), 0.2276940 secs][Full GC 48780K->46415K(50816K), 0.2233279 secs][Full GC 49551K->49551K(50816K), 0.2396315 secs][Full GC 50815K->50815K(50816K), 0.1886312 secs][Full GC 50815K->49219K(50816K), 0.1964926 secs][Full GC 50815K->50815K(50816K), 0.1865343 secs][Full GC 50815K->50815K(50816K), 0.1836961 secs]

    We only find a kind of garbage collection (Full GC), total Java heap usage before garbage collection (50,815K), total Java heap usage after garbage collection (45,644K), a lofty watermark of total Java heap (50,816K), and time spent in the garbage collection (0.2276940 secs).

    High watermark is the size of the current Java heap. The Java heap can expand its size up to a maximum size or constrict to manage Java heap effectively.

    The -XX:+PrintGCDetails option lets the JVM provide information on each generation in the Java heap.

    We can descry Java heap usage and the time (in seconds) spent in Java garbage collection of each unique generation, tenured generation, and permanent generation with the -XX:+PrintGCDetails option in the following example:

    [GC [DefNew: 3520K->3520K(3520K), 0.0001143 secs][Tenured: 43897K->47295K(47296K), 0.2110999 secs] 47417K->47415K(50816K), [Perm : 17K->17K(12288K)], 0.2115593 secs][Times: user=0.22 sys=0.00, real=0.22 secs]

    In tenured generation, Java heap usage was 43,897KB before this Java garbage collection. Java heap usage reached 47,295KB after Java garbage collection; 47296K is the size of the lofty watermark of the tenured generation; 0.2110999 second was spent to collect the tenured generation. Unfortunately they accomplish not descry the maximum size of each generation with the -XX:+PrintGCDetails option alone.

    With -XX:+PrintGCTimeStamps, they can find a timestamp for each garbage collection affection this:

    1.393: [GC 1002K->106K(5056K), 0.0001036 secs]

    This garbage collection started 1.393 seconds after the JVM started.

    The -XX:+PrintHeapAtGC option provides extensive information about each Java garbage collection (see Listing 5).

    We can even descry the address ambit of each generation. Unfortunately there's no timestamp for each garbage collection with -XX:+PrintHeapAtGC option alone.

    The last option, -XX:-HeapDumpOnOutOfMemoryError allows the JVM to dump the Java heap to a file when an allocation from the Java heap cannot subsist satisfied or a java.lang.OutOfMemoryError is thrown. This option was introduced in Sun Java 1.4.2 update 12 and Sun Java 5.0 update 7.

    If you want to experiment with IBM's Java Virtual Machine, everyone you necessity is a -verbosegc command-line option. You accomplish not necessity any of these: -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC, or -XX:+HeapDumpOnOutOfMemoryError.

    Let's hold a quest at what happened to the class while they talked about Sun JVM's command-line option. We've got java.lang.OutOfMemoryError from TestObjectWYieldFinalizer:

    Exception in the thread "main" java.lang.OutOfMemoryError: Java heap spaceat java.lang.ref.Finalizer.register(Finalizer.java:72)at java.lang.Object.<init>(Object.java:20)at ObjectWYieldFinalizer.<init>(ObjectWYieldFinalizer.java:2)at TestObjectWYieldFinalizer.main(TestObjectWYieldFinalizer.java:11)

    "java.lang.OutOfMemoryError: Java heap space." That means they got Java heap space exhaustion. The JVM could not allocate any more Java heap while running the mode java.lang.ref.Finalizer.register(), which is on line 72 of Finalizer.java. Finalizer.java? Of course, they did not write Finalizer.java. That's a fraction of the JVM. They can furthermore check verbosegc.txt to which they redirected the garbage collection trace (see Listing 6).

    About 3.711 seconds after the JVM started, they got java.lang.OutOfMemoryError. The Java heap dump is written to pid124.hprof.

    Analysis of Java Garbage Collection TracesWe can utilize a utensil to resolve this trace. The IBM Pattern Modeling and Analysis utensil for Java Garbage Collector (PMAT) is one of top five technologies at alphaWorks. I acquire implemented patented algorithms to call future failures related to Java heap exhaustion in this tool. gratify mention to United States Patent No. 7,475,214 if you are interested in the algorithms. Although they don't necessity these algorithms to investigate simple problem affection this, you might subsist able to find situations where you could find some insight from fortune tellers. They can find a copy of the utensil here.

    PMAT parses verbose garbage collection (GC) trace, analyzes Java heap usage, and recommends feasible solutions based on pattern modeling of Java heap usage.

    The following features are included:

  • GC analysis
  • GC table view
  • Allocation failure summary
  • GC usage summary
  • GC duration summary
  • GC graph view
  • GC pattern analysis
  • Zoom in/out/selection/center of chart view
  • The utensil can furthermore parse Sun's Java garbage collector traces, including the following:

  • Serial collector
  • Throughput/parallel collector
  • Concurrent collector
  • Incremental/train collector
  • We can start version 3.2 of the utensil with a jar file in the download package. (V3.2 was the latest version when this article was written.)

    # /usr/java5/bin/java -Xmx200m -jar ga32.jar

    The utensil provides a headless mode but let's bring up the graphical user interface mode for effortless demonstration. They can click on the "N" icon to open Sun's trace file. They can click on "I" for IBM's trace file as seen in motif 1.

    We can descry in motif 2 the analysis result and recommendation virtually instantly.



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