org.apache.flink.runtime.concurrent.Executors Maven / Gradle / Ivy
/*
* 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.flink.runtime.concurrent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.annotation.Nonnull;
import java.util.concurrent.Executor;
import scala.concurrent.ExecutionContext;
/**
* Collection of {@link Executor} implementations.
*/
public class Executors {
private static final Logger LOG = LoggerFactory.getLogger(Executors.class);
/**
* Return a direct executor. The direct executor directly executes the runnable in the calling
* thread.
*
* @return Direct executor
*/
public static Executor directExecutor() {
return DirectExecutor.INSTANCE;
}
/**
* Direct executor implementation.
*/
private static class DirectExecutor implements Executor {
static final DirectExecutor INSTANCE = new DirectExecutor();
private DirectExecutor() {}
@Override
public void execute(@Nonnull Runnable command) {
command.run();
}
}
/**
* Return a direct execution context. The direct execution context executes the runnable directly
* in the calling thread.
*
* @return Direct execution context.
*/
public static ExecutionContext directExecutionContext() {
return DirectExecutionContext.INSTANCE;
}
/**
* Direct execution context.
*/
private static class DirectExecutionContext implements ExecutionContext {
static final DirectExecutionContext INSTANCE = new DirectExecutionContext();
private DirectExecutionContext() {}
@Override
public void execute(Runnable runnable) {
runnable.run();
}
@Override
public void reportFailure(Throwable cause) {
throw new IllegalStateException("Error in direct execution context.", cause);
}
@Override
public ExecutionContext prepare() {
return this;
}
}
}