| /* |
| * 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.accumulo.tserver; |
| |
| import static java.util.Objects.requireNonNull; |
| |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import org.apache.accumulo.core.dataImpl.KeyExtent; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class ActiveAssignmentRunnable implements Runnable { |
| private static final Logger log = LoggerFactory.getLogger(ActiveAssignmentRunnable.class); |
| |
| private final ConcurrentHashMap<KeyExtent,RunnableStartedAt> activeAssignments; |
| private final KeyExtent extent; |
| private final Runnable delegate; |
| |
| // Make sure that the other thread calling getException will see the assignment by the thread |
| // calling run() |
| private volatile Thread executingThread; |
| |
| public ActiveAssignmentRunnable(ConcurrentHashMap<KeyExtent,RunnableStartedAt> activeAssignments, |
| KeyExtent extent, Runnable delegate) { |
| requireNonNull(activeAssignments); |
| requireNonNull(extent); |
| requireNonNull(delegate); |
| this.activeAssignments = activeAssignments; |
| this.extent = extent; |
| this.delegate = delegate; |
| } |
| |
| @Override |
| public void run() { |
| if (activeAssignments.containsKey(extent)) { |
| throw new IllegalStateException("Active assignment already exists for " + extent); |
| } |
| |
| executingThread = Thread.currentThread(); |
| |
| try { |
| RunnableStartedAt runnableWithStartTime = |
| new RunnableStartedAt(this, System.currentTimeMillis()); |
| log.trace("Started assignment for {} at {}", extent, runnableWithStartTime.getStartTime()); |
| activeAssignments.put(extent, runnableWithStartTime); |
| delegate.run(); |
| } finally { |
| if (log.isTraceEnabled()) { |
| // Avoid the call to currentTimeMillis if we'd just throw it away anyways |
| log.trace("Finished assignment for {} at {}", extent, System.currentTimeMillis()); |
| } |
| activeAssignments.remove(extent); |
| } |
| } |
| |
| public Exception getException() { |
| final Exception e = new Exception("Assignment of " + extent); |
| if (executingThread != null) { |
| e.setStackTrace(executingThread.getStackTrace()); |
| } |
| return e; |
| } |
| } |