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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.dialer.common.concurrent;
import com.google.common.util.concurrent.AbstractListeningExecutorService;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.TimeUnit;
import javax.inject.Inject;
/**
* An ExecutorService that delegates to the UI thread. Rejects attempts to shut down, and all
* shutdown related APIs are unimplemented.
*
*/
public class UiThreadExecutor extends AbstractListeningExecutorService {
@Inject
public UiThreadExecutor() {}
@Override
public void shutdown() {
throw new UnsupportedOperationException();
}
@Override
public List<Runnable> shutdownNow() {
throw new UnsupportedOperationException();
}
@Override
public boolean isShutdown() {
return false;
}
@Override
public boolean isTerminated() {
return false;
}
@Override
public boolean awaitTermination(long l, TimeUnit timeUnit) throws InterruptedException {
throw new UnsupportedOperationException();
}
@Override
public <V> ListenableFuture<V> submit(final Callable<V> task) {
final SettableFuture<V> resultFuture = SettableFuture.create();
ThreadUtil.postOnUiThread(
() -> {
try {
resultFuture.set(task.call());
} catch (Exception e) {
// uncaught exceptions on the UI thread should crash the app
resultFuture.setException(e);
throw new RuntimeException(e);
}
});
return resultFuture;
}
@Override
public void execute(final Runnable runnable) {
ThreadUtil.postOnUiThread(runnable);
}
}
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