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"Agent-Based Computing in Java"
Vol. 6, Issue 1, p. 66


Listing 1: A Cougaar Plug-In

 // Cougaar classes are in the ‘alp' packages
import alp.cluster.IncrementalSubscription;
import alp.util.UnaryPredicate;
import java.util.Enumeration;

public class ExamplePlugIn extends alp.plugin.SimplePlugIn
  private IncrementalSubscription
  private UnaryPredicate allStringsPredicate = 
          new UnaryPredicate() {
    public boolean execute(Object o) {
      return o instanceof String;

   * Establish subscription for Strings
  public void setupSubscriptions() {
    allStringsSubscription =


 * Handle changes to the subscription
  public void execute() {

 Enumeration e =   
      System.out.println("Got a string: "+


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