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/*
* 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.activemq.artemis.utils.actors;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executor;
import java.util.concurrent.TimeUnit;
import java.util.function.Consumer;
public interface ArtemisExecutor extends Executor {
/**
* Artemis is supposed to implement this properly, however in tests or tools
* this can be used as a fake, doing a simple delegate and using the default methods implemented here.
* @param executor
* @return
*/
static ArtemisExecutor delegate(Executor executor) {
return executor::execute;
}
/**
* It will wait the current execution (if there is one) to finish
* but will not complete any further executions.
*
* @param onPendingTask it will be called for each pending task found
* @return the number of pending tasks that won't be executed
*/
default int shutdownNow(Consumer onPendingTask, int timeout, TimeUnit unit) {
return 0;
}
/** To be used to flush an executor from a different thread.
* WARNING: Do not call this within the executor. That would be stoopid ;)
*
* @param timeout
* @param unit
* @return
*/
default boolean flush(long timeout, TimeUnit unit) {
CountDownLatch latch = new CountDownLatch(1);
execute(latch::countDown);
try {
return latch.await(timeout, unit);
} catch (Exception e) {
return false;
}
}
/**
* It will wait the current execution (if there is one) to finish
* but will not complete any further executions
*/
default int shutdownNow() {
return shutdownNow(t -> {
}, 1, TimeUnit.SECONDS);
}
default void shutdown() {
}
/**
* It will give up the executor loop, giving a chance to other OrderedExecutors to run
*/
default void yield() {
}
default boolean isFair() {
return false;
}
/** If this OrderedExecutor is fair, it will yield for another executors after each task ran */
default ArtemisExecutor setFair(boolean fair) {
return this;
}
/**
* This will verify if the executor is flushed with no wait (or very minimal wait if not the {@link org.apache.activemq.artemis.utils.actors.OrderedExecutor}
* @return
*/
default boolean isFlushed() {
CountDownLatch latch = new CountDownLatch(1);
execute(latch::countDown);
try {
return latch.await(100, TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
return false;
}
}
}