package net.pterodactylus.jsite.core;
+import java.beans.PropertyChangeEvent;
+import java.beans.PropertyChangeListener;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
-import java.util.HashSet;
+import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;
-import java.util.Set;
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.fcp.highlevel.HighLevelException;
+import net.pterodactylus.fcp.highlevel.KeyGenerationResult;
+import net.pterodactylus.jsite.util.IdGenerator;
import net.pterodactylus.util.io.Closer;
+import net.pterodactylus.util.logging.Logging;
+import net.pterodactylus.util.number.Hex;
/**
* TODO
- *
+ *
* @author David ‘Bombe’ Roden <bombe@freenetproject.org>
- * @version $Id$
*/
-public class NodeManager {
+public class NodeManager implements Iterable<Node>, PropertyChangeListener, HighLevelClientListener {
/** Logger. */
- private static final Logger logger = Logger.getLogger(NodeManager.class.getName());
+ private static final Logger logger = Logging.getLogger(NodeManager.class.getName());
/** The FCP client name. */
private final String clientName;
/** 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>());
+ /** Map from node ID to node. */
+ private Map<String, Node> idNodes = Collections.synchronizedMap(new HashMap<String, Node>());
- /** Keeps track of which connection is in use right now. */
- private Set<HighLevelClient> usedConnections = Collections.synchronizedSet(new HashSet<HighLevelClient>());
+ /** All FCP connections. */
+ private Map<Node, HighLevelClient> nodeClients = Collections.synchronizedMap(new HashMap<Node, HighLevelClient>());
/** Maps nodes to high-level clients. */
private Map<HighLevelClient, Node> clientNodes = Collections.synchronizedMap(new HashMap<HighLevelClient, Node>());
/**
* Creates a new FCP collector.
- *
+ *
* @param clientName
* The name of the FCP client
* @param directory
}
//
+ // 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 a node was added.
+ *
+ * @param node
+ * The node that was added.
+ */
+ private void fireNodeAdded(Node node) {
+ for (NodeListener nodeListener : nodeListeners) {
+ nodeListener.nodeAdded(node);
+ }
+ }
+
+ /**
+ * Notifies all listeners that a node was removed.
+ *
+ * @param node
+ * The node that was removed
+ */
+ private void fireNodeRemoved(Node node) {
+ for (NodeListener nodeListener : nodeListeners) {
+ nodeListener.nodeRemoved(node);
+ }
+ }
+
+ /**
+ * 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 a connection to a node has failed.
+ *
+ * @param node
+ * The node that could not be connected
+ * @param cause
+ * The cause of the failure
+ */
+ private void fireNodeConnectionFailed(Node node, Throwable cause) {
+ for (NodeListener nodeListener : nodeListeners) {
+ nodeListener.nodeConnectionFailed(node, cause);
+ }
+ }
+
+ /**
+ * 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
//
/**
* Returns the directory in which the nodes are stored.
- *
+ *
* @return The directory the nodes are stored in
*/
public String getDirectory() {
/**
* Checks whether the given node is already connected.
- *
+ *
* @param node
* The node to check
* @return <code>true</code> if the node is already connected,
return nodes.contains(node);
}
+ /**
+ * {@inheritDoc}
+ */
+ public Iterator<Node> iterator() {
+ return nodes.iterator();
+ }
+
//
// ACTIONS
//
/**
* Loads nodes.
- *
+ *
* @throws IOException
* if an I/O error occurs loading the nodes
*/
List<Node> loadedNodes = new ArrayList<Node>();
while (nodeProperties.containsKey("nodes." + ++nodeIndex + ".name")) {
String nodePrefix = "nodes." + nodeIndex;
+ String nodeId = nodeProperties.getProperty(nodePrefix + ".id");
+ if (nodeId == null) {
+ nodeId = Hex.toHex(IdGenerator.generateId());
+ }
String nodeName = nodeProperties.getProperty(nodePrefix + ".name");
if (!Verifier.verifyNodeName(nodeName)) {
logger.log(Level.WARNING, "invalid node name “" + nodeName + "”, skipping…");
continue;
}
Node newNode = new Node();
+ newNode.setId(nodeId);
newNode.setName(nodeName);
newNode.setHostname(nodeHostname);
newNode.setPort(nodePort);
loadedNodes.add(newNode);
}
+ logger.fine("loaded " + loadedNodes.size() + " nodes from config");
synchronized (syncObject) {
nodes.clear();
- nodes.addAll(loadedNodes);
+ for (Node node : loadedNodes) {
+ addNode(node);
+ }
}
}
/**
* Saves all configured nodes.
- *
+ *
* @throws IOException
* if an I/O error occurs saving the nodes
*/
}
Properties nodeProperties = new Properties();
int nodeIndex = -1;
- for (Node node: nodes) {
+ for (Node node : nodes) {
String nodePrefix = "nodes." + ++nodeIndex;
+ nodeProperties.setProperty(nodePrefix + ".id", node.getId());
nodeProperties.setProperty(nodePrefix + ".name", node.getName());
nodeProperties.setProperty(nodePrefix + ".hostname", node.getHostname());
nodeProperties.setProperty(nodePrefix + ".port", String.valueOf(node.getPort()));
}
/**
- * 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
+ * @return <code>true</code> if the node was added, <code>false</code>
+ * if the node was not added because it was already known
*/
- public boolean addNode(Node node) throws UnknownHostException, IOException {
+ public boolean addNode(Node node) {
if (nodes.contains(node)) {
- return true;
+ logger.warning("was told to add already known node: " + node);
+ return false;
}
- 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. */
+ node.addPropertyChangeListener(this);
+ HighLevelClient highLevelClient = new HighLevelClient(clientName);
+ nodes.add(node);
+ idNodes.put(node.getId(), node);
+ clientNodes.put(highLevelClient, node);
+ nodeClients.put(node, highLevelClient);
+ highLevelClient.addHighLevelClientListener(this);
+ fireNodeAdded(node);
+ return true;
+ }
+
+ /**
+ * 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);
+ }
+ nodes.remove(node);
+ idNodes.remove(node.getId());
+ node.removePropertyChangeListener(this);
+ fireNodeRemoved(node);
}
- if (connectResult.isConnected()) {
- synchronized (syncObject) {
- nodes.add(node);
- nodeConnections.put(node, highLevelClient);
- clientNodes.put(highLevelClient, node);
+ }
+
+ /**
+ * Tries to establish a connection with the given node.
+ *
+ * @param node
+ * The node to connect to
+ */
+ public void connect(Node node) {
+ HighLevelClient highLevelClient;
+ highLevelClient = nodeClients.get(node);
+ if (highLevelClient == null) {
+ logger.warning("was told to connect to unknown node: " + node);
+ return;
+ }
+ try {
+ highLevelClient.connect(node.getHostname(), node.getPort());
+ } catch (UnknownHostException uhe1) {
+ fireNodeConnectionFailed(node, uhe1);
+ } catch (IOException ioe1) {
+ fireNodeConnectionFailed(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();
}
/**
* Returns a list of all nodes.
- *
+ *
* @return A list of all nodes
*/
public List<Node> getNodes() {
- return new ArrayList<Node>(clientNodes.values());
+ return Collections.unmodifiableList(nodes);
+ }
+
+ /**
+ * Returns the high-level client for a given node.
+ *
+ * @param node
+ * The node to get a high-level client for
+ * @return The high-level client for a node, or <code>null</code> if the
+ * node was disconnected or removed
+ */
+ public HighLevelClient getHighLevelClient(Node node) {
+ return nodeClients.get(node);
+ }
+
+ /**
+ * Returns the node for a high-level client.
+ *
+ * @param highLevelClient
+ * The high-level client to get the node for
+ * @return The node for the high-level client, or <code>null</code> if the
+ * high-level client is not known
+ */
+ public Node getNode(HighLevelClient highLevelClient) {
+ return clientNodes.get(highLevelClient);
+ }
+
+ /**
+ * Returns the node identified by the given ID.
+ *
+ * @param id
+ * The ID of the node
+ * @return The node with the given ID, or <code>null</code> if no such
+ * node was found
+ */
+ Node getNode(String id) {
+ return idNodes.get(id);
+ }
+
+ /**
+ * Generates a new SSK key pair.
+ *
+ * @return An array with the private key at index <code>0</code> and the
+ * public key at index <code>1</code>
+ * @throws IOException
+ * if an I/O error occurs communicating with the node
+ * @throws JSiteException
+ * if there is a problem with the node
+ */
+ public String[] generateKeyPair() throws IOException, JSiteException {
+ if (nodes.isEmpty()) {
+ throw new NoNodeException("no node configured");
+ }
+ Node node = nodes.get(0);
+ HighLevelClient highLevelClient = nodeClients.get(node);
+ try {
+ KeyGenerationResult keyGenerationResult = highLevelClient.generateKey().getResult();
+ return new String[] { keyGenerationResult.getInsertURI(), keyGenerationResult.getRequestURI() };
+ } catch (HighLevelException hle1) {
+ throw new BackendException(hle1);
+ } catch (InterruptedException e) {
+ /* ignore. */
+ }
+ return null;
}
//
// PRIVATE METHODS
//
+ //
+ // INTERFACE HighLevelClientListener
+ //
+
/**
- * Finds a currently unused high-level client, optionally waiting until a
- * client is free and marking it used.
- *
- * @param wait
- * <code>true</code> to wait for a free connection,
- * <code>false</code> to return <code>null</code>
- * @param markAsUsed
- * <code>true</code> to mark the connection as used before
- * returning it, <code>false</code> not to mark it
- * @return An unused FCP connection, or <code>null</code> if no connection
- * could be found
+ * {@inheritDoc}
*/
- @SuppressWarnings("unused")
- private HighLevelClient findUnusedClient(boolean wait, boolean markAsUsed) {
+ public void clientConnected(HighLevelClient highLevelClient) {
+ logger.log(Level.FINER, "clientConnected(c=" + 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) {
+ logger.log(Level.FINER, "clientDisconnected(c=" + highLevelClient + ",t=" + throwable + ")");
synchronized (syncObject) {
- HighLevelClient freeHighLevelClient = null;
- while (freeHighLevelClient == null) {
- for (HighLevelClient highLevelClient: nodeConnections.values()) {
- if (!usedConnections.contains(highLevelClient)) {
- freeHighLevelClient = highLevelClient;
- break;
- }
+ Node node = clientNodes.get(highLevelClient);
+ if (node == null) {
+ logger.log(Level.WARNING, "got event for unknown client");
+ return;
+ }
+ fireNodeDisconnected(node, throwable);
+ }
+ }
+
+ //
+ // INTERFACE PropertyChangeListener
+ //
+
+ /**
+ * {@inheritDoc}
+ */
+ public void propertyChange(PropertyChangeEvent propertyChangeEvent) {
+ Object eventSource = propertyChangeEvent.getSource();
+ if (eventSource instanceof Node) {
+ String propertyName = propertyChangeEvent.getPropertyName();
+ if ("hostname".equals(propertyName) || "port".equals(propertyName)) {
+ Node node = (Node) eventSource;
+ HighLevelClient highLevelClient = nodeClients.get(node);
+ if (highLevelClient == null) {
+ logger.log(Level.WARNING, "got property change event for unknown node: " + node);
+ return;
}
- if (freeHighLevelClient != null) {
- if (markAsUsed) {
- usedConnections.add(freeHighLevelClient);
+ if (highLevelClient.isConnected()) {
+ highLevelClient.disconnect();
+ try {
+ highLevelClient.connect(node.getHostname(), node.getPort());
+ } catch (UnknownHostException uhe1) {
+ fireNodeConnectionFailed(node, uhe1);
+ } catch (IOException ioe1) {
+ fireNodeConnectionFailed(node, ioe1);
}
- return freeHighLevelClient;
- }
- if (!wait) {
- return null;
}
}
- /* we never get here, but the compiler doesn't realize. */
- return null;
}
}
projects / jSite2.git / blobdiff