Caffeinated PHP Zendcon 2009 by Kevin Schroeder

Caffeinated PHP
Kevin Schroeder
Technical Consultant
Zend Technologies

About me
Kevin Schroeder
Consultant for Zend
Programmer
Sys Admin
Author
Etc.
Me!

PHP is growing in the enterprise
Programmers (Millions)
Part-Time Developers and Hobbyists
This means that enterprise PHP developers are going to increasingly need to work with non-PHP systems and do “non-PHP things”
Independent Software Vendors
Corporate ITDevelopers
Source: Gartner Dec 2007, Findings – Corporate and IT Programmers Will Discover PHP's Benefits in Larger Numbers
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PHP Extensions
Can handle tasks that computationally intensive
Can provide integration into existing third party software
Some are bundled with the standard PHP distribution, some must be downloaded separately
You can write your own!!
Written in C
What if you are not a C programmer? …or at least, not a good one
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PHP: 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 functionality
The Bottom Line(s)
It allows you to extend PHP without building a C-based PHP module
or
The PHP/Java Bridge allows you easily connect in with Java-based applications or use existing Java APIs in PHP
or
Allows you to port applications from Java to PHP on a part-by-part basis
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Where does the Java Bridge fit?
JEE
JAAS
JNDI
Beans
J3D
JMX
JMS
Your Java Code
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A (rough) Architecture

Installing the Java Bridge – Windows
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Installing the Java Bridge - yum
For Zend Server 4
yum install
java-bridge-zend-pe
For Zend Server 5
yum install
php-5.2-java-bridge-zend-server
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Installing the Java Bridge - apt
aptitude install
java-bridge-zend-pe
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Installing the Java Bridge - Setup
Make sure to execute
/usr/local/zend/bin/zendctl.sh setup-jb

Installing the Java Bridge - Configuration

How do you use it?
<?php
header('Content-Type: text/plain');
$system = new Java('java.lang.System');
var_dump( $system->getProperties() );
?>
Which produces:
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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.
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How do you use it?
What did you notice?
$system->getProperties() returns an object of type Properties
But var_dump($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.
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How do you use it?
Conversions
Integer = int
Long = float
String = string
StringBuffer/Builder remain Java objects
Java arrays are converted to PHP arrays
All other objects retain their status as Java objects and can be called as such within the PHP code
For example$java = new java('java.util.jar.JarFile','me.jar');$entry = $java->getJarEntry('me.txt');$attributes = $entry->getAttributes();
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Use Case #1 - Printing
Using the Java Bridge does not just mean running simple Java classes in PHP
There are several technologies available in the Java stack that could benefit you
Printing is one…

Printing to JPS from PHP
Part of the javax package
Prints using the Java2D interface or via java.awt.print

Creating a JPS abstraction layer
Code in com.zend.Printer

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

Adding printer support to the Java Bridge
Restart the Java Bridge server

Let’s look at some code

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

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

Let’s look at some code

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

Step 1 – Set up a JMS Broker
We’re using ActiveMQ
http://activemq.apache.org/
Download and unzip
Start with a regular user
bin/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 helper
resources.frontController.actionhelperpaths.Default_Helper = APPLICATION_PATH "/helpers“
To the CLASSPATH, add
All the libraries in active-mq/lib
(hint: don’t type it in by hand)

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

Receiving a message
What’s this issue with how this is done?
It is a blocking request
Why is it done that way?
Because only messages sent during the connection’s active phase are received
When 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?

Debugging
Debugging 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=1044
Verify that the debugger is running on port 1044
[root@localhost ~]# lsof -i -P | grep 1044
java 8256 apache 4u IPv4 14277 TCP *:1044 (LISTEN)
Create a new Remote Debug Run configuration and attach

Questions?
More information can be found at
http://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”)

Caffeinated PHP Zendcon 2009 by Kevin Schroeder

by Sam Hennessy on Oct 26, 2009

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Caffeinated PHP Zendcon 2009 by Kevin Schroeder — Presentation Transcript