ExecutorCompat.java
/*
* Copyright 2020 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.core.os;
import android.os.Handler;
import androidx.annotation.NonNull;
import androidx.core.util.Preconditions;
import java.util.concurrent.Executor;
import java.util.concurrent.RejectedExecutionException;
/**
* Helper for accessing features in {@link Executor}.
*/
public final class ExecutorCompat {
/** Creates an adapter {@link Executor} that posts all executed tasks onto the given
* {@link Handler}.
*/
public static @NonNull Executor create(@NonNull Handler handler) {
return new HandlerExecutor(handler);
}
private ExecutorCompat() {
}
private static class HandlerExecutor implements Executor {
private final Handler mHandler;
HandlerExecutor(@NonNull Handler handler) {
mHandler = Preconditions.checkNotNull(handler);
}
@Override
public void execute(@NonNull Runnable command) {
if (!mHandler.post(Preconditions.checkNotNull(command))) {
throw new RejectedExecutionException(mHandler + " is shutting down");
}
}
}
}