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/*
* Copyright (C) 2011 The Guava Authors
*
* 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.google.common.cache;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.annotations.Beta;
import java.util.concurrent.Executor;
/**
* A collection of common removal listeners.
*
* @author Charles Fry
* @since 10.0
*/
@Beta
public final class RemovalListeners {
private RemovalListeners() {}
/**
* Returns a {@code RemovalListener} which processes all eviction
* notifications using {@code executor}.
*
* @param listener the backing listener
* @param executor the executor with which removal notifications are
* asynchronously executed
*/
public static RemovalListener asynchronous(
final RemovalListener listener, final Executor executor) {
checkNotNull(listener);
checkNotNull(executor);
return new RemovalListener() {
@Override
public void onRemoval(final RemovalNotification notification) {
executor.execute(new Runnable() {
@Override
public void run() {
listener.onRemoval(notification);
}
});
}
};
}
}