Caffeinated PHPKevin SchroederTechnical ConsultantZend Technologies

About meKevin SchroederConsultant for ZendProgrammerSys AdminAuthorEtc.Me!

PHP is growing in the enterpriseProgrammers (Millions)Part-Time Developers and HobbyistsThis means that enterprise PHP developers are going to increasingly need to work with non-PHP systems and do “non-PHP things”Independent Software VendorsCorporate ITDevelopersSource: Gartner Dec 2007, Findings – Corporate and IT Programmers Will Discover PHP's Benefits in Larger Numbers| 3 | 21-Oct-09

PHP ExtensionsCan handle tasks that computationally intensiveCan provide integration into existing third party softwareSome are bundled with the standard PHP distribution, some must be downloaded separatelyYou can write your own!!Written in CWhat if you are not a C programmer? …or at least, not a good one| 4 | 21-Oct-09PHP: Past and Present

Why Use The Java Bridge?On the web PHP will do most of what you need to do, easier.Java can fill missing integration points in PHP or augment functionalityThe Bottom Line(s)It allows you to extend PHP without building a C-based PHP moduleorThe PHP/Java Bridge allows you easily connect in with Java-based applications or use existing Java APIs in PHPorAllows you to port applications from Java to PHP on a part-by-part basis| 5 | 21-Oct-09

Where does the Java Bridge fit?JEEJAASJNDIBeansJ3DJMXJMSYour Java Code| 6 | 21-Oct-09

A (rough) Architecture

Installing the Java Bridge – Windows| 8 | 21-Oct-09

Installing the Java Bridge - yumFor Zend Server 4yum install java-bridge-zend-peFor Zend Server 5yum install php-5.2-java-bridge-zend-server| 9 | 21-Oct-09

Installing the Java Bridge - aptaptitude install java-bridge-zend-pe| 10 | 21-Oct-09

Installing the Java Bridge - SetupMake sure to execute/usr/local/zend/bin/zendctl.sh setup-jb

Installing the Java Bridge - Configuration

How do you use it?<?phpheader('Content-Type: text/plain');$system = new Java('java.lang.System');var_dump( $system->getProperties() );?>Which produces:| 13 | 21-Oct-09

How do you use it?array(50) { ["java.runtime.name"]=> string(48) "Java(TM) 2 Runtime Environment, Standard Edition“ ["sun.boot.library.path"]=> string(29) "/usr/jdk1.5.0_09/jre/lib/i386" ["java.vm.version"]=> string(12) "1.5.0_09-b01" ["java.vm.vendor"]=> string(21) "Sun Microsystems Inc." ["java.vendor.url"]=> string(20) "http://java.sun.com/" ["path.separator"]=> string(1) ":" ["java.vm.name"]=> string(26) "Java HotSpot(TM) Client VM“ ["file.encoding.pkg"]=> string(6) "sun.io“ ["user.country"]=> string(2) "US" ["sun.os.patch.level"]=> string(7) "unknown“ ["java.vm.specification.name"]=> string(34) "Java Virtual Machine Specification" Etc, etc.| 14 | 21-Oct-09

How do you use it?What did you notice?$system->getProperties() returns an object of type PropertiesBut var_dump($system->getProperties()) displayed a PHP associative array.What does that tell us?The PHP-Java bridge will convert any Hashtable-derived object into a PHP associative array.Hashtable methods are no longer available after conversion.| 15 | 21-Oct-09

How do you use it?ConversionsInteger = intLong = floatString = stringStringBuffer/Builder remain Java objectsJava arrays are converted to PHP arraysAll other objects retain their status as Java objects and can be called as such within the PHP codeFor example$java = new java('java.util.jar.JarFile','me.jar');$entry = $java->getJarEntry('me.txt');$attributes = $entry->getAttributes();| 16 | 21-Oct-09

Use Case #1 - PrintingUsing the Java Bridge does not just mean running simple Java classes in PHPThere are several technologies available in the Java stack that could benefit youPrinting is one…

Printing to JPS from PHPPart of the javax packagePrints using the Java2D interface or via java.awt.print

Creating a JPS abstraction layerCode in com.zend.Printer

Adding printer support to the Java BridgeEdit the file /usr/local/zend/etc/watchdog-jb.ini

Adding printer support to the Java BridgeRestart the Java Bridge server

Let’s look at some code

Case #2 – Object SerializationSerialization is the process of transforming data into a format that can be transferred across a networkPHP does serialization really wellPHP NEEDS to do serialization really wellJava doesn’t do, or need to do, extensive serializationAny Java object that implements the java.io.Serializable interface can be stored as a string

Object Serialization – Serializing to PHPTo store the entire Java object each property must implement java.io.SerializableSerialization should occur before a shutdown hook.It may work beforehand, but don’t count on itTherefore, explicitly serialize your objectZF app dispatchLoopShutdown() is a good place if you are serializing to a session variable

Let’s look at some code

Case #3 – JMS IntegrationJMS = Java Messaging System (not the creator of Babylon 5)It is an API for sending messages (data) (very) loosely coupledAsynchronous or synchronous

Step 1 – Set up a JMS BrokerWe’re using ActiveMQhttp://activemq.apache.org/Download and unzipStart with a regular userbin/activemq-admin start

Step 2 – Browse to http://dev:8161/admin

Step 3 – Create a queue (or don’t)

Step 4 – Send a message (and get it)

Step 5 – View the message

Step 6 – Do it in PHP Probably best implemented as an action helperresources.frontController.actionhelperpaths.Default_Helper = APPLICATION_PATH "/helpers“To the CLASSPATH, addAll the libraries in active-mq/lib(hint: don’t type it in by hand)

Receiving a messageFirst need to create a helper that initializes the appropriate Java objects. Default_Helper_MqReceiving a message involves creating a consumer based on a topic and calling receive()Let’s look at some code!!

Receiving a messageWhat’s this issue with how this is done?It is a blocking requestWhy is it done that way?Because only messages sent during the connection’s active phase are receivedWhen running in a JVM on a desktop, not problem but since we’re running on a web site this may need some work to make it work well with your app… but we also seem to have a bug with a sort of dead-lock. So… how do we fix it?

DebuggingDebugging PHP is easy but how about Java from the Java Bridge?Add this to the watchdog-jb.ini file-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=1044Verify that the debugger is running on port 1044[root@localhost ~]# lsof -i -P | grep 1044java 8256 apache 4u IPv4 14277 TCP *:1044 (LISTEN)Create a new Remote Debug Run configuration and attach

Questions?More information can be found athttp://devzone.zend.com/article/4776-PHP-and-Java-Using-Java-Print-Service-with-Zend-Server-Community-Edition (just search for “Java Print Service” on the Devzone)http://files.zend.com/help/Zend-Server/java_bridge_component.htm (or just Google “Zend Java Bridge”)