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/*-
* ============LICENSE_START=======================================================
* ONAP
* ================================================================================
* Copyright (C) 2020-2021 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.common.utils.time;
import java.util.LinkedList;
import java.util.Queue;
import java.util.concurrent.Executor;
import lombok.Getter;
/**
* Executor that will run tasks until the queue is empty or a maximum number of tasks have
* been executed. Doesn't actually run anything until {@link #runAll()} is invoked.
*/
public class PseudoExecutor implements Executor {
/**
* Tasks to be run.
*/
@Getter
private final Queue<Runnable> tasks = new LinkedList<>();
/**
* Gets the queue length.
*
* @return the queue length
*/
public int getQueueLength() {
return tasks.size();
}
@Override
public void execute(Runnable command) {
tasks.add(command);
}
/**
* Runs all tasks until the queue is empty or the maximum number of tasks have been
* reached.
*
* @param maxTasks maximum number of tasks to run
* @return {@code true} if the queue is empty, {@code false} if the maximum number of
* tasks have been reached before the queue was emptied
*/
public boolean runAll(int maxTasks) {
for (var count = 0; count < maxTasks && !tasks.isEmpty(); ++count) {
tasks.remove().run();
}
return tasks.isEmpty();
}
}
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