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/*
* Copyright (C) 2017 The Android Open Source Project
*
* 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.android.google.gce.gceservice;
import android.util.Log;
import java.util.ArrayList;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.TimeUnit;
import com.google.common.util.concurrent.AbstractFuture;
public class GceFuture<T> extends AbstractFuture<T> {
private static final String LOG_TAG = "GceFuture";
private final String mName;
public GceFuture(String name) {
mName = name;
}
public String getName() {
return mName;
}
@Override
public boolean set(T value) {
if (super.set(value)) {
return true;
} else {
Exception e = new Exception();
Log.e(LOG_TAG, mName + ": Multiple return values from a future object.", e);
return false;
}
}
public void set(Exception e) {
if (!super.setException(e)) {
Log.w(LOG_TAG, mName + ": Discarding execution exception -- job done.", e);
return;
}
Log.w(LOG_TAG, mName + ": Could not complete job: " + e.getMessage(), e);
}
@Override
public boolean cancel(boolean canInterrupt) {
// TODO(schuffelen): See if this can be deleted, since GceFuture.cancel is never invoked
// directly.
// We do not support interrupting jobs on purpose:
// this offers us little benefit (stripping maybe a second or two), at the expense
// of killing something that may cascade, like BroadcastReceiver.
return super.setException(new CancellationException("cancelled"));
}
@Override
public boolean isCancelled() {
if (isDone()) {
try {
get();
} catch (ExecutionException ex) {
return ex.getCause() instanceof CancellationException;
} catch (InterruptedException ex) {
return false;
} catch (CancellationException ex) {
return true;
}
}
return false;
}
/** Convert list of GceFuture objects to string representation.
*/
public static String toString(ArrayList<GceFuture<?>> futures) {
StringBuilder b = new StringBuilder();
for (GceFuture<?> dep : futures) {
if (b.length() > 0) b.append(", ");
b.append(dep.getName());
}
return b.toString();
}
}
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