inital check-in of cache replicator

src/helma/objectmodel/db/Replicator.java

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+// Replicator.java
+// Copyright (c) Hannes Wallnöfer 2001
+ 
+package helma.objectmodel.db;
+
+import helma.framework.IRemoteApp;
+import java.rmi.*;
+import java.util.*;
+
+/**
+ * This class replicates the updates of transactions to other applications via RMI
+ */
+ 
+public class Replicator implements Runnable {
+
+    String url;
+    Vector add, delete, currentAdd, currentDelete;
+    Thread runner;
+
+    public Replicator (String url) {
+	this.url = url;
+	add = new Vector ();
+	delete = new Vector ();
+	runner = new Thread (this);
+	runner.start ();
+    }
+
+
+    public void run () {
+	while (Thread.currentThread () == runner) {
+	    try {
+	        if (prepareReplication ()) {
+	            IRemoteApp app = (IRemoteApp) Naming.lookup (url);
+	            app.replicateCache (currentAdd, currentDelete);
+	        }
+	    } catch (Exception x) {
+	        System.err.println ("ERROR REPLICATING CACHE: "+x);
+	    }
+
+	    try {
+	        if (runner != null)
+	            runner.sleep (1000l);
+	    } catch (InterruptedException ir) {
+	        runner = null;
+	    }
+	}
+    }
+
+    public synchronized void addNewNode (Node n) {
+	add.addElement (n);
+    }
+
+    public synchronized void addModifiedNode (Node n) {
+	add.addElement (n);
+    }
+
+    public synchronized void addDeletedNode (Node n) {
+	delete.addElement (n);
+    }
+
+    private synchronized boolean prepareReplication () {
+	if (add.size() == 0 && delete.size() == 0)
+	    return false;
+	currentAdd = add;
+	currentDelete = delete;
+	add = new Vector ();
+	delete = new Vector ();
+	return true;
+    }
+
+}
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