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com.hivemq.extensions.executor.task.AsyncOutputImpl Maven / Gradle / Ivy
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HiveMQ CE is a Java-based open source MQTT broker that fully supports MQTT 3.x and MQTT 5
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/*
* Copyright 2019-present HiveMQ GmbH
*
* 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.
*/
package com.hivemq.extensions.executor.task;
import com.google.common.util.concurrent.SettableFuture;
import com.hivemq.extension.sdk.api.annotations.NotNull;
import com.hivemq.extension.sdk.api.async.Async;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
/**
* @author Christoph Schäbel
*/
public class AsyncOutputImpl implements Async {
@NotNull
private final T output;
@NotNull
private final SettableFuture asyncFuture;
@NotNull
private final ScheduledFuture timeoutTaskFuture;
@NotNull
private Status status;
public AsyncOutputImpl(
@NotNull final T output,
@NotNull final SettableFuture asyncFuture,
@NotNull final ScheduledFuture timeoutTaskFuture) {
this.output = output;
this.asyncFuture = asyncFuture;
this.timeoutTaskFuture = timeoutTaskFuture;
status = Status.RUNNING;
}
@Override
public void resume() {
timeoutTaskFuture.cancel(true);
status = Status.DONE;
asyncFuture.set(true);
}
@NotNull
@Override
public T getOutput() {
return output;
}
@NotNull
@Override
public Status getStatus() {
if (asyncFuture.isDone()) {
try {
//timeout is not needed here, because the future is already done, but better safe than sorry
return asyncFuture.get(1, TimeUnit.SECONDS) ? Status.DONE : Status.CANCELED;
} catch (final Exception e) {
return Status.CANCELED;
}
}
return status;
}
}