/*
* 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.facebook.presto.hive.util;
import io.airlift.log.Logger;
import java.util.concurrent.Executor;
import java.util.concurrent.atomic.AtomicReference;
public final class ResumableTasks
{
private static final Logger log = Logger.get(ResumableTasks.class);
private ResumableTasks()
{
}
public static void submit(Executor executor, ResumableTask task)
{
AtomicReference<Runnable> runnableReference = new AtomicReference<>();
Runnable runnable = () -> {
ResumableTask.TaskStatus status = safeProcessTask(task);
if (!status.isFinished()) {
status.getContinuationFuture().thenRun(() -> executor.execute(runnableReference.get()));
}
};
runnableReference.set(runnable);
executor.execute(runnable);
}
private static ResumableTask.TaskStatus safeProcessTask(ResumableTask task)
{
try {
return task.process();
}
catch (Throwable t) {
log.warn(t, "ResumableTask completed exceptionally");
return ResumableTask.TaskStatus.finished();
}
}
}