--- /dev/null
+/*
+ * jSite2 - NodeListener.java -
+ * Copyright © 2008 David Roden
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+package net.pterodactylus.jsite.core;
+
+import java.util.EventListener;
+
+/**
+ * Interface for listeners that want to be notified about node events.
+ *
+ * @author David ‘Bombe’ Roden <bombe@freenetproject.org>
+ * @version $Id$
+ */
+public interface NodeListener extends EventListener {
+
+ /**
+ * Notifies a listener that a connection to the given node was established.
+ *
+ * @param node
+ * The node that is now connected
+ */
+ public void nodeConnected(Node node);
+
+ /**
+ * Notifies a listener that a connection to the given node was severed. The
+ * listener is responsible for
+ *
+ * @param node
+ * The node that is now disconnected
+ * @param throwable
+ * The exception that caused the disconnect, or <code>null</code>
+ * if there was no exception
+ */
+ public void nodeDisconnected(Node node, Throwable throwable);
+
+}
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
-import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.logging.Level;
import java.util.logging.Logger;
-import net.pterodactylus.fcp.highlevel.ConnectResult;
-import net.pterodactylus.fcp.highlevel.HighLevelCallback;
import net.pterodactylus.fcp.highlevel.HighLevelClient;
+import net.pterodactylus.fcp.highlevel.HighLevelClientListener;
import net.pterodactylus.util.io.Closer;
/**
* @author David ‘Bombe’ Roden <bombe@freenetproject.org>
* @version $Id$
*/
-public class NodeManager {
+public class NodeManager implements HighLevelClientListener {
/** Logger. */
private static final Logger logger = Logger.getLogger(NodeManager.class.getName());
/** Object used for synchronization. */
private final Object syncObject = new Object();
+ /** Node listeners. */
+ private List<NodeListener> nodeListeners = Collections.synchronizedList(new ArrayList<NodeListener>());
+
/** All nodes. */
private List<Node> nodes = Collections.synchronizedList(new ArrayList<Node>());
/** All FCP connections. */
- private Map<Node, HighLevelClient> nodeConnections = Collections.synchronizedMap(new HashMap<Node, HighLevelClient>());
+ private Map<Node, HighLevelClient> nodeClients = Collections.synchronizedMap(new HashMap<Node, HighLevelClient>());
/** Keeps track of which connection is in use right now. */
private Set<HighLevelClient> usedConnections = Collections.synchronizedSet(new HashSet<HighLevelClient>());
}
//
+ // EVENT MANAGEMENT
+ //
+
+ /**
+ * Adds the given listener to the list of listeners.
+ *
+ * @param nodeListener
+ * The listener to add
+ */
+ public void addNodeListener(NodeListener nodeListener) {
+ nodeListeners.add(nodeListener);
+ }
+
+ /**
+ * Removes the given listener from the list of listeners.
+ *
+ * @param nodeListener
+ * The listener to remove
+ */
+ public void removeNodeListener(NodeListener nodeListener) {
+ nodeListeners.remove(nodeListener);
+ }
+
+ /**
+ * Notifies all listeners that the given node was connected.
+ *
+ * @param node
+ * The node that is now connected
+ */
+ private void fireNodeConnected(Node node) {
+ for (NodeListener nodeListener: nodeListeners) {
+ nodeListener.nodeConnected(node);
+ }
+ }
+
+ /**
+ * Notifies all listeners that the given node was disconnected.
+ *
+ * @param node
+ * The node that is now disconnected
+ * @param throwable
+ * The exception that caused the disconnect, or <code>null</code>
+ * if there was no exception
+ */
+ private void fireNodeDisconnected(Node node, Throwable throwable) {
+ for (NodeListener nodeListener: nodeListeners) {
+ nodeListener.nodeDisconnected(node, throwable);
+ }
+ }
+
+ //
// ACCESSORS
//
}
/**
- * Adds a connection to the given node. The connection is made instantly so
- * this method may block. If the node can not be connected, it will not be
- * added to the list of nodes.
+ * Adds the given node to this manager.
*
+ * @see #connect(Node)
* @param node
* The node to connect to
- * @return <code>true</code> if the connection to the node could be
- * established
- * @throws UnknownHostException
- * if the hostname of the node can not be resolved
- * @throws IOException
- * if an I/O error occurs connecting to the node
*/
- public boolean addNode(Node node) throws UnknownHostException, IOException {
- if (nodes.contains(node)) {
- return true;
+ public void addNode(Node node) {
+ synchronized (syncObject) {
+ if (!nodes.contains(node)) {
+ nodes.add(node);
+ }
}
- HighLevelClient highLevelClient = new HighLevelClient(clientName, node.getHostname(), node.getPort());
- HighLevelCallback<ConnectResult> connectCallback = highLevelClient.connect();
- ConnectResult connectResult = null;
- while (connectResult == null) {
- try {
- connectResult = connectCallback.getResult();
- } catch (InterruptedException e) {
- /* ignore. */
+ }
+
+ /**
+ * Removes the given node from the node manager, disconnecting it if it is
+ * currently connected.
+ *
+ * @param node
+ * The node to remove
+ */
+ public void removeNode(Node node) {
+ synchronized (syncObject) {
+ if (!nodes.contains(node)) {
+ return;
+ }
+ if (nodeClients.containsKey(node)) {
+ disconnect(node);
}
}
- if (connectResult.isConnected()) {
+ }
+
+ /**
+ * Tries to establish a connection with the given node.
+ *
+ * @param node
+ * The node to connect to
+ */
+ public void connect(Node node) {
+ try {
+ HighLevelClient highLevelClient = new HighLevelClient(clientName, node.getHostname(), node.getPort());
synchronized (syncObject) {
- nodes.add(node);
- nodeConnections.put(node, highLevelClient);
clientNodes.put(highLevelClient, node);
+ nodeClients.put(node, highLevelClient);
}
+ highLevelClient.addHighLevelClientListener(this);
+ highLevelClient.connect();
+ } catch (IOException ioe1) {
+ fireNodeDisconnected(node, ioe1);
+ }
+ }
+
+ /**
+ * Disconnects the given node without removing it.
+ *
+ * @param node
+ * The node to disconnect
+ */
+ public void disconnect(Node node) {
+ synchronized (syncObject) {
+ if (!nodes.contains(node)) {
+ return;
+ }
+ HighLevelClient highLevelClient = nodeClients.get(node);
+ highLevelClient.disconnect();
}
- return connectResult.isConnected();
}
/**
* @return A list of all nodes
*/
public List<Node> getNodes() {
- return new ArrayList<Node>(clientNodes.values());
+ return Collections.unmodifiableList(nodes);
}
//
synchronized (syncObject) {
HighLevelClient freeHighLevelClient = null;
while (freeHighLevelClient == null) {
- for (HighLevelClient highLevelClient: nodeConnections.values()) {
+ for (HighLevelClient highLevelClient: nodeClients.values()) {
if (!usedConnections.contains(highLevelClient)) {
freeHighLevelClient = highLevelClient;
break;
}
}
+ //
+ // INTERFACE HighLevelClientListener
+ //
+
+ /**
+ * {@inheritDoc}
+ */
+ public void clientConnected(HighLevelClient highLevelClient) {
+ Node node = clientNodes.get(highLevelClient);
+ if (node == null) {
+ logger.log(Level.WARNING, "got event for unknown client");
+ return;
+ }
+ fireNodeConnected(node);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public void clientDisconnected(HighLevelClient highLevelClient, Throwable throwable) {
+ synchronized (syncObject) {
+ Node node = clientNodes.remove(highLevelClient);
+ if (node == null) {
+ logger.log(Level.WARNING, "got event for unknown client");
+ return;
+ }
+ nodeClients.remove(node);
+ fireNodeDisconnected(node, throwable);
+ }
+ }
+
}
projects / jSite2.git / commitdiff