| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.hadoop.eclipse.dfs; |
| |
| import java.io.IOException; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.apache.hadoop.eclipse.server.HadoopServer; |
| import org.apache.hadoop.eclipse.servers.IHadoopServerListener; |
| import org.apache.hadoop.eclipse.servers.ServerRegistry; |
| import org.apache.hadoop.fs.FileSystem; |
| |
| /** |
| * Representation of the root element containing all DFS servers. This |
| * content registers an observer on Hadoop servers so as to update itself |
| * when servers are updated. |
| */ |
| public class DFSLocationsRoot implements DFSContent, IHadoopServerListener { |
| |
| /** |
| * |
| */ |
| private final DFSContentProvider provider; |
| |
| private Map<HadoopServer, DFSLocation> map = |
| new HashMap<HadoopServer, DFSLocation>(); |
| |
| /** |
| * Register a listeners to track DFS locations updates |
| * |
| * @param provider the content provider this content is the root of |
| */ |
| DFSLocationsRoot(DFSContentProvider provider) { |
| this.provider = provider; |
| ServerRegistry.getInstance().addListener(this); |
| this.refresh(); |
| } |
| |
| /* |
| * Implementation of IHadoopServerListener |
| */ |
| |
| /* @inheritDoc */ |
| public synchronized void serverChanged(final HadoopServer location, |
| final int type) { |
| |
| switch (type) { |
| case ServerRegistry.SERVER_STATE_CHANGED: { |
| this.provider.refresh(map.get(location)); |
| break; |
| } |
| |
| case ServerRegistry.SERVER_ADDED: { |
| DFSLocation dfsLoc = new DFSLocation(provider, location); |
| map.put(location, dfsLoc); |
| this.provider.refresh(this); |
| break; |
| } |
| |
| case ServerRegistry.SERVER_REMOVED: { |
| map.remove(location); |
| this.provider.refresh(this); |
| break; |
| } |
| } |
| } |
| |
| /** |
| * Recompute the map of Hadoop locations |
| */ |
| private synchronized void reloadLocations() { |
| map.clear(); |
| for (HadoopServer location : ServerRegistry.getInstance().getServers()) |
| map.put(location, new DFSLocation(provider, location)); |
| } |
| |
| /* @inheritDoc */ |
| @Override |
| public String toString() { |
| return "DFS Locations"; |
| } |
| |
| /* |
| * Implementation of DFSContent |
| */ |
| |
| /* @inheritDoc */ |
| public synchronized DFSContent[] getChildren() { |
| return this.map.values().toArray(new DFSContent[this.map.size()]); |
| } |
| |
| /* @inheritDoc */ |
| public boolean hasChildren() { |
| return (this.map.size() > 0); |
| } |
| |
| /* @inheritDoc */ |
| public void refresh() { |
| reloadLocations(); |
| this.provider.refresh(this); |
| } |
| |
| /* |
| * Actions |
| */ |
| |
| public void disconnect() { |
| Thread closeThread = new Thread() { |
| /* @inheritDoc */ |
| @Override |
| public void run() { |
| try { |
| System.out.printf("Closing all opened File Systems...\n"); |
| FileSystem.closeAll(); |
| System.out.printf("File Systems closed\n"); |
| |
| } catch (IOException ioe) { |
| ioe.printStackTrace(); |
| } |
| } |
| }; |
| |
| // Wait 5 seconds for the connections to be closed |
| closeThread.start(); |
| try { |
| closeThread.join(5000); |
| |
| } catch (InterruptedException ie) { |
| // Ignore |
| } |
| } |
| |
| } |