| /* |
| * 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.drill.exec.testing; |
| |
| import com.fasterxml.jackson.annotation.JsonAutoDetect; |
| import com.fasterxml.jackson.annotation.JsonAutoDetect.Visibility; |
| import com.fasterxml.jackson.annotation.JsonCreator; |
| import com.fasterxml.jackson.annotation.JsonProperty; |
| import org.apache.drill.shaded.guava.com.google.common.base.Preconditions; |
| import org.apache.drill.common.concurrent.ExtendedLatch; |
| |
| /** |
| * See {@link org.apache.drill.exec.testing.CountDownLatchInjection} Degenerates to |
| * {@link org.apache.drill.exec.testing.PauseInjection#pause}, if initialized to zero count. In any case, this injection |
| * provides more control than PauseInjection. |
| */ |
| @JsonAutoDetect(fieldVisibility = Visibility.ANY) |
| public class CountDownLatchInjectionImpl extends Injection implements CountDownLatchInjection { |
| private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(CountDownLatchInjectionImpl.class); |
| |
| private ExtendedLatch latch = null; |
| |
| @JsonCreator // ensures instances are created only through JSON |
| private CountDownLatchInjectionImpl(@JsonProperty("address") final String address, |
| @JsonProperty("port") final int port, |
| @JsonProperty("siteClass") final String siteClass, |
| @JsonProperty("desc") final String desc) throws InjectionConfigurationException { |
| super(address, port, siteClass, desc, 0, 1, 0L); |
| } |
| |
| @Override |
| protected boolean injectNow() { |
| return true; |
| } |
| |
| @Override |
| public void initialize(final int count) { |
| Preconditions.checkArgument(latch == null, "Latch can be initialized only once at %s in %s.", desc, |
| siteClass.getSimpleName()); |
| Preconditions.checkArgument(count > 0, "Count has to be a positive integer at %s in %s.", desc, |
| siteClass.getSimpleName()); |
| latch = new ExtendedLatch(count); |
| } |
| |
| @Override |
| public void await() throws InterruptedException { |
| Preconditions.checkNotNull(latch, "Latch not initialized in %s at %s.", siteClass.getSimpleName(), desc); |
| try { |
| latch.await(); |
| } catch (final InterruptedException e) { |
| logger.warn("Interrupted while awaiting in {} at {}.", siteClass.getSimpleName(), desc); |
| throw e; |
| } |
| } |
| |
| @Override |
| public void awaitUninterruptibly() { |
| Preconditions.checkNotNull(latch, "Latch not initialized in %s at %s.", siteClass.getSimpleName(), desc); |
| latch.awaitUninterruptibly(); |
| } |
| |
| @Override |
| public void countDown() { |
| Preconditions.checkNotNull(latch, "Latch not initialized in %s at %s.", siteClass.getSimpleName(), desc); |
| Preconditions.checkArgument(latch.getCount() > 0, "Counting down on latch more than intended."); |
| latch.countDown(); |
| } |
| |
| @Override |
| public void close() { |
| latch = null; |
| } |
| } |