ListenableFutureTask.java
/*
* Copyright (C) 2022 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 androidx.test.espresso.util.concurrent;
import androidx.annotation.RestrictTo;
import androidx.annotation.RestrictTo.Scope;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.concurrent.Callable;
import java.util.concurrent.Executor;
import java.util.concurrent.FutureTask;
/**
* Minimal fork of Guava's ListenableFutureTask to avoid the full dependency.
*
* @hide
*/
@RestrictTo(Scope.LIBRARY)
public class ListenableFutureTask<V> extends FutureTask<V> implements ListenableFuture<V> {
// The execution list to hold our listeners.
private final ExecutionList executionList = new ExecutionList();
/**
* Creates a {@code ListenableFutureTask} that will upon running, execute the given {@code
* Callable}.
*
* @param callable the callable task
*/
public static <V> ListenableFutureTask<V> create(Callable<V> callable) {
return new ListenableFutureTask<>(callable);
}
protected ListenableFutureTask(Callable<V> callable) {
super(callable);
}
@Override
public void addListener(Runnable listener, Executor exec) {
executionList.add(listener, exec);
}
/** Internal implementation detail used to invoke the listeners. */
@Override
protected void done() {
executionList.execute();
}
}