| /* |
| * Licensed 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.karaf.cellar.core.command; |
| |
| import org.apache.karaf.cellar.core.Node; |
| import org.apache.karaf.cellar.core.event.Event; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.concurrent.BlockingQueue; |
| import java.util.concurrent.LinkedBlockingQueue; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * Command. |
| */ |
| public class Command<R extends Result> extends Event { |
| |
| protected static final transient Logger LOGGER = LoggerFactory.getLogger(Command.class); |
| protected static final long DEFAULT_TIMEOUT = 30000; |
| |
| protected long timeout; |
| protected final BlockingQueue<Map<Node, R>> resultQueue = new LinkedBlockingQueue<Map<Node, R>>(); |
| protected final Map<Node, R> nodeResults = new HashMap<Node, R>(); |
| |
| public Command(String id) { |
| super(id); |
| this.force = true; |
| if (System.getProperty("cellar.timeout") != null) { |
| try { |
| this.timeout = Long.parseLong(System.getProperty("cellar.timeout")); |
| } catch (Exception e) { |
| this.timeout = DEFAULT_TIMEOUT; |
| } |
| } else { |
| this.timeout = DEFAULT_TIMEOUT; |
| } |
| } |
| |
| @Override |
| public Boolean getForce() { |
| return true; |
| } |
| |
| /** |
| * Process the event of timeout. |
| */ |
| public void onTimeout() { |
| try { |
| resultQueue.put(nodeResults); |
| } catch (InterruptedException e) { |
| LOGGER.error("Error adding result to result queue", e); |
| } |
| } |
| |
| /** |
| * Add {@code Results} to the result queue. |
| * |
| * @param results the results in the queue. |
| */ |
| public void addResults(R... results) { |
| if (results != null && results.length > 0) { |
| for (R result : results) { |
| nodeResults.put(result.getSourceNode(), result); |
| } |
| |
| if (getDestination() == null || (nodeResults.size() == getDestination().size())) { |
| try { |
| resultQueue.put(nodeResults); |
| } catch (InterruptedException e) { |
| LOGGER.error("Error adding result to result queue", e); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Return the responses. |
| * If no result is found, it returns an empty map. |
| * |
| * @return a map of results. |
| * @throws InterruptedException in case of interruption. |
| */ |
| public Map<Node, R> getResult() throws InterruptedException { |
| Map<Node, R> nodeResults = null; |
| if (this.resultQueue != null) { |
| nodeResults = resultQueue.poll(timeout, TimeUnit.MILLISECONDS); |
| } |
| return nodeResults; |
| } |
| |
| public long getTimeout() { |
| return timeout; |
| } |
| |
| public void setTimeout(long timeout) { |
| this.timeout = timeout; |
| } |
| |
| } |