| /* |
| * 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.cassandra.concurrent; |
| |
| import java.util.concurrent.*; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.cassandra.service.StorageService; |
| import org.apache.cassandra.utils.JVMStabilityInspector; |
| |
| /** |
| * Like DebuggableThreadPoolExecutor, DebuggableScheduledThreadPoolExecutor always |
| * logs exceptions from the tasks it is given, even if Future.get is never called elsewhere. |
| * |
| * DebuggableScheduledThreadPoolExecutor also catches exceptions during Task execution |
| * so that they don't supress subsequent invocations of the task. |
| * |
| * Finally, there is a special rejected execution handler for tasks rejected during the shutdown hook. |
| * |
| * For fire and forget tasks (like ref tidy) we can safely ignore the exceptions. |
| * For any callers that care to know their task was rejected we cancel passed task. |
| */ |
| public class DebuggableScheduledThreadPoolExecutor extends ScheduledThreadPoolExecutor |
| { |
| private static final Logger logger = LoggerFactory.getLogger(DebuggableScheduledThreadPoolExecutor.class); |
| |
| public static final RejectedExecutionHandler rejectedExecutionHandler = new RejectedExecutionHandler() |
| { |
| public void rejectedExecution(Runnable task, ThreadPoolExecutor executor) |
| { |
| if (executor.isShutdown()) |
| { |
| if (!StorageService.instance.isInShutdownHook()) |
| throw new RejectedExecutionException("ScheduledThreadPoolExecutor has shut down."); |
| |
| //Give some notification to the caller the task isn't going to run |
| if (task instanceof Future) |
| ((Future) task).cancel(false); |
| |
| logger.trace("ScheduledThreadPoolExecutor has shut down as part of C* shutdown"); |
| } |
| else |
| { |
| throw new AssertionError("Unknown rejection of ScheduledThreadPoolExecutor task"); |
| } |
| } |
| }; |
| |
| public DebuggableScheduledThreadPoolExecutor(int corePoolSize, String threadPoolName, int priority) |
| { |
| super(corePoolSize, new NamedThreadFactory(threadPoolName, priority)); |
| setRejectedExecutionHandler(rejectedExecutionHandler); |
| } |
| |
| public DebuggableScheduledThreadPoolExecutor(int corePoolSize, ThreadFactory threadFactory) |
| { |
| super(corePoolSize, threadFactory); |
| setRejectedExecutionHandler(rejectedExecutionHandler); |
| } |
| |
| public DebuggableScheduledThreadPoolExecutor(String threadPoolName) |
| { |
| this(1, threadPoolName, Thread.NORM_PRIORITY); |
| setRejectedExecutionHandler(rejectedExecutionHandler); |
| } |
| |
| // We need this as well as the wrapper for the benefit of non-repeating tasks |
| @Override |
| public void afterExecute(Runnable r, Throwable t) |
| { |
| super.afterExecute(r,t); |
| DebuggableThreadPoolExecutor.logExceptionsAfterExecute(r, t); |
| } |
| |
| // override scheduling to supress exceptions that would cancel future executions |
| @Override |
| public ScheduledFuture<?> scheduleAtFixedRate(Runnable command, long initialDelay, long period, TimeUnit unit) |
| { |
| return super.scheduleAtFixedRate(new UncomplainingRunnable(command), initialDelay, period, unit); |
| } |
| |
| @Override |
| public ScheduledFuture<?> scheduleWithFixedDelay(Runnable command, long initialDelay, long delay, TimeUnit unit) |
| { |
| return super.scheduleWithFixedDelay(new UncomplainingRunnable(command), initialDelay, delay, unit); |
| } |
| |
| private static class UncomplainingRunnable implements Runnable |
| { |
| private final Runnable runnable; |
| |
| public UncomplainingRunnable(Runnable runnable) |
| { |
| this.runnable = runnable; |
| } |
| |
| public void run() |
| { |
| try |
| { |
| runnable.run(); |
| } |
| catch (Throwable t) |
| { |
| JVMStabilityInspector.inspectThrowable(t); |
| DebuggableThreadPoolExecutor.handleOrLog(t); |
| } |
| } |
| } |
| } |