Terracota HelloWorld

Here you can find step by step How to for creating Terracotta cluster application

1. Download and install Terracotta

2. Create the main test class

import java.util.List;
import java.util.ArrayList;
import java.util.Date;

public class HelloWorld {

private List<Child> children = new ArrayList<Child>();

public void sayHello() {
 synchronized (children) {
   Child myChild = new Child(new Date());
   children.add(myChild);
   for (Child child : children) {
      System.out.println("Hello "
                         + child.getBirthdate());
   }
 }
}

public static void main(String[] args) {
 new HelloWorld().sayHello();
}
}

3. Create the class for storing in Terracotta

import java.util.Date;

//Not Serializable!
class Child {

private Date birthdate;

public Child(Date birthdate) {
 this.birthdate = birthdate;
}

public Date getBirthdate() {
 return birthdate;
}

}

4. Compile them

5. Create the config file 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>HelloWorld.children</field-name></root>
</roots>
<locks>
 <autolock>
   <method-expression>* HelloWorld*.*(..)</method-expression>
 </autolock>
</locks>
<instrumented-classes>
  <include>
    <class-expression>Child</class-expression>
  </include>
</instrumented-classes>
</dso>
</application>
</tc:tc-config>

6. Start the server:

$ start-tc-server.sh

8. Start a client:

$ dso-java.sh -Dtc.config=tc-config.xml HelloWorld

Output: Hello Thu Dec 13 17:46:58 CET 2007

7. After starting the 2nd client:

Hello Thu Dec 13 17:46:58 CET 2007
Hello Thu Dec 13 17:47:06 CET 2007

As you see, the state is preserved in the server between executions.