Terracotta

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(The following has been tested with Resin 3.1.5 and Terracotta 2.5.4)

Contents

Terracotta Distributed Shared Objects (DSOs) and Resin

  1. Download Resin from http://www.caucho.com/download
  2. Unzip Resin. From now on, we'll refer to the location of the Resin root directory as $RESIN
  3. Download Terracotta from http://www.terracotta.org
  4. Unzip Terracotta. From now on, we'll refer to the location of the Terracotta root directory as $TERRACOTTA
  5. Create the example webapp directory structure: 
    mkdir -p $RESIN/webapps/terracotta/WEB-INF/classes/example/
  6. Create the configuration file $RESIN/webapps/terracotta/WEB-INF/resin-web.xml 
    <?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://caucho.com/ns/resin">
  <servlet servlet-name="hello-servlet"
           servlet-class="example.HelloWorldServlet"/>

  <servlet-mapping url-pattern="/*" servlet-name="hello-servlet"/>
</web-app>
  7. Create the HelloWorld Servlet /usr/local/share/resin/webapps/terracotta/WEB-INF/classes/example/HelloWorldServlet.java 
    package example;

import java.io.*;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class HelloWorldServlet extends HttpServlet {
  // this is the variable that Terracotta will distribute
  private ArrayList<Calendar> _accessTimes = new ArrayList<Calendar>();

  @Override
  public void doGet(HttpServletRequest req, HttpServletResponse resp)
    throws ServletException, IOException
  {
    Calendar now = Calendar.getInstance();

    synchronized(_accessTimes) {
      _accessTimes.add((Calendar) now.clone());
      DateFormat format = new SimpleDateFormat("yyyy.MM.dd G 'at' HH:mm:ss z");

      resp.setContentType("text/html");

      PrintWriter out = resp.getWriter();

      out.println("<html>");
      out.println("<body>");

      for (Calendar calendar : _accessTimes) {
        out.println("<br/>" + format.format(calendar.getTime()));
      }

      out.println("</body>");
      out.println("</html>");
    }
  }
}
  8. Create the Terracotta configuration file $RESIN/tc-config.xml 
    <?xml version="1.0" encoding="UTF-8"?>
<tc:tc-config xmlns:tc="http://www.terracotta.org/config">
  <application>
    <dso>
      <roots>
        <root>
          <field-name>example.HelloWorldServlet._accessTimes</field-name>
        </root>
      </roots>
      <locks>
        <autolock>
          <method-expression>* example.HelloWorldServlet*.*(..)</method-expression>
          <lock-level>write</lock-level>
        </autolock>
      </locks>
      <instrumented-classes>
        <include><class-expression>example..*</class-expression></include>
      </instrumented-classes>
      <additional-boot-jar-classes>
        <include>java.util.TimeZone</include>
        <include>sun.util.calendar.ZoneInfo</include>
       </additional-boot-jar-classes>
    </dso>
  </application>
</tc:tc-config>
  9. Create the Terracotta boot jar: 
    $TERRACOTTA/bin/make-boot-jar.sh -f $RESIN/tc-config.xml

    Note the path of the boot jar created by this command. You will use it in the next step.

  10. Edit resin.conf, making the following changes: 
    1. <jvm-arg>-Dcom.sun.management.jmxremote</jvm-arg>
<jvm-arg>-Xbootclasspath/p:<path-to-boot-jar></jvm-arg>
<jvm-arg>-Dtc.install-root=<path-to-terracotta></jvm-arg>
<jvm-arg>-Dtc.config=localhost:9510</jvm-arg>

      Make sure to replace the <path-to-boot-jar> and <path-to-terracotta>.

    2. Remove the line 
      <http address="*" port="8080"/>
      from <server-default> section.
    3. Remove the default server line 
      <server id="" address="127.0.0.1" port="6800"/>
    4. Add two servers: 
            <server id="a" address="127.0.0.1" port="6800">
        <http address="*" port="8080"/>
      </server>

      <server id="b" address="127.0.0.1" port="6801">
        <http address="*" port="8081"/>
      </server>
  11. Start the Terracotta server: 
    $TERRACOTTA/bin/start-tc-server.sh -f $RESIN/tc-config.xml
  12. Start both Resin servers: 
    cd $RESIN
java -jar lib/resin.jar -server a start
java -jar lib/resin.jar -server b start
  13. Browse to http://localhost:8080/terracotta and hit refresh a few times. You should see a date added to the page on each refresh.
  14. Open another browser window to http://localhost:8081/terracotta. You should see the same dates from the previous page, but with one now added.
  15. You can run 
    $TERRACOTTA/bin/admin.sh
    to see the details of the shared objects that Terracotta is managing.

Terracotta Sessions and Resin

Terracotta sessions are built on their DSOs, so much of the instructions will be the same. We will use Quercus here to show how to use Java sessions from PHP and how Terracotta is able to share Java sessions even through PHP and Quercus.

  1. Download Resin from http://www.caucho.com/download
  2. Unzip Resin. From now on, we'll refer to the location of the Resin root directory as $RESIN
  3. Download Terracotta from http://www.terracotta.org
  4. Unzip Terracotta. From now on, we'll refer to the location of the Terracotta root directory as $TERRACOTTA
  5. Create the example webapp directory structure: 
    mkdir -p $RESIN/webapps/terracotta/WEB-INF/classes/example/
  6. Create the example PHP file $RESIN/webapps/terracotta/index.php 
    <?php

import com.caucho.server.resin.Resin;

$resin = Resin::getLocal();

echo "This server is $resin<br/>";

$session = $request->getSession(true);

$count = $session->getAttribute("count");


if (!isset($count)) {
  $session->setAttribute("count", 0);
} else {
  $session->setAttribute("count", $count+1);
}

echo "Count: " . $session->getAttribute("count");
?>
  7. Create the Terracotta configuration file $RESIN/tc-config.xml 
    <?xml version="1.0" encoding="UTF-8"?>
<tc:tc-config xsi:schemaLocation="http://www.terracotta.org/schema/terracotta-4.xsd" xmlns:tc="http://www.terracotta.org/config" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <!--Tell DSO where the Terracotta server can be found; 
       See the Terracotta DSO Guide for additional information.-->
  <servers>
    <server host="%i" name="sample">
      <data>data/server-data</data>
      <logs>logs/server-logs</logs>
    </server>
    <update-check>
      <enabled>true</enabled>
    </update-check>
  </servers>
  <!--Tell DSO where to put the generated client logs
       See the Terracotta DSO Guide for additional information.-->
  <clients>
    <logs>logs/client-logs/%(webserver.log.name)</logs>
  </clients>
  <application>
    <dso>      
      <instrumented-classes>
        <!--Include all classes for DSO instrumentation-->
        <include>
          <class-expression>*..*</class-expression>
        </include>
      </instrumented-classes>

      <!--Tell DSO which applications in your web container is using DSO-->
      <web-applications>
        <web-application>terracotta</web-application>
      </web-applications>
    </dso>
  </application>
</tc:tc-config>
  8. Create the Terracotta boot jar: 
    $TERRACOTTA/bin/make-boot-jar.sh -f $RESIN/tc-config.xml

    Note the path of the boot jar created by this command. You will use it in the next step.

  9. Edit resin.conf, making the following changes: 
    1. <jvm-arg>-Dcom.sun.management.jmxremote</jvm-arg>
<jvm-arg>-Xbootclasspath/p:<path-to-boot-jar></jvm-arg>
<jvm-arg>-Dtc.install-root=<path-to-terracotta></jvm-arg>
<jvm-arg>-Dtc.config=localhost:9510</jvm-arg>

      Make sure to replace the <path-to-boot-jar> and <path-to-terracotta>.

    2. Remove the line 
      <http address="*" port="8080"/>
      from <server-default> section.
    3. Remove the default server line 
      <server id="" address="127.0.0.1" port="6800"/>
    4. Add two servers: 
            <server id="a" address="127.0.0.1" port="6800">
        <http address="*" port="8080"/>
      </server>

      <server id="b" address="127.0.0.1" port="6801">
        <http address="*" port="8081"/>
      </server>
    5. Add Terracotta's session filter under the <web-app-default> section: 
            <filter filter-name='terracotta'
              filter-class='com.terracotta.session.SessionFilter'/>
      <filter-mapping url-pattern='/*' filter-name='terracotta'/>
  10. Copy the Terracotta session jar to Resin's lib directory: 
    cp $TERRACOTTA/lib/session/tc-session.jar $RESIN/lib
  11. Start the Terracotta server: 
    $TERRACOTTA/bin/start-tc-server.sh -f $RESIN/tc-config.xml
  12. Start both Resin servers: 
    cd $RESIN
java -jar lib/resin.jar -server a start
java -jar lib/resin.jar -server b start
  13. Browse to http://localhost:8080/terracotta and hit refresh a few times. You should see an updated count on each refresh.
  14. Open another browser window to http://localhost:8081/terracotta. You should see the count from the previous page, incremented by one.
  15. You can run 
    $TERRACOTTA/bin/admin.sh
    to see the details of the shared objects that Terracotta is managing.
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