| /* |
| * 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 accord.utils; |
| |
| import java.util.concurrent.ScheduledFuture; |
| import java.util.concurrent.ScheduledThreadPoolExecutor; |
| import java.util.concurrent.TimeUnit; |
| |
| import accord.api.Scheduler; |
| import org.apache.cassandra.utils.concurrent.UncheckedInterruptedException; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class ThreadPoolScheduler implements Scheduler |
| { |
| private static final Logger logger = LoggerFactory.getLogger(ThreadPoolScheduler.class); |
| final ScheduledThreadPoolExecutor exec = new ScheduledThreadPoolExecutor(1); |
| public ThreadPoolScheduler() |
| { |
| exec.setMaximumPoolSize(1); |
| } |
| |
| static class FutureAsScheduled implements Scheduled |
| { |
| final ScheduledFuture<?> f; |
| |
| FutureAsScheduled(ScheduledFuture<?> f) |
| { |
| this.f = f; |
| } |
| |
| @Override |
| public void cancel() |
| { |
| f.cancel(true); |
| } |
| } |
| |
| static Runnable wrap(Runnable runnable) |
| { |
| return () -> |
| { |
| try |
| { |
| runnable.run(); |
| } |
| catch (Throwable t) |
| { |
| logger.error("Unhandled Exception", t); |
| throw t; |
| } |
| }; |
| } |
| |
| @Override |
| public Scheduled recurring(Runnable run, long delay, TimeUnit units) |
| { |
| return new FutureAsScheduled(exec.scheduleWithFixedDelay(wrap(run), delay, delay, units)); |
| } |
| |
| @Override |
| public Scheduled once(Runnable run, long delay, TimeUnit units) |
| { |
| return new FutureAsScheduled(exec.schedule(wrap(run), delay, units)); |
| } |
| |
| @Override |
| public void now(Runnable run) |
| { |
| exec.execute(wrap(run)); |
| } |
| |
| public void stop() |
| { |
| exec.shutdown(); |
| try |
| { |
| if (!exec.awaitTermination(1L, TimeUnit.MINUTES)) |
| throw new IllegalStateException("did not terminate"); |
| } |
| catch (InterruptedException e) |
| { |
| throw new UncheckedInterruptedException(e); |
| } |
| } |
| } |