com.google.common.cache.RemovalListeners.java Source code

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Here is the source code for com.google.common.cache.RemovalListeners.java

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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 java.util.concurrent.Executor;

/**
 * A collection of common removal listeners.
 *
 * @author Charles Fry
 * @since 10.0
 */
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 <K, V> RemovalListener<K, V> asynchronous(final RemovalListener<K, V> listener,
            final Executor executor) {
        checkNotNull(listener);
        checkNotNull(executor);
        return new RemovalListener<K, V>() {
            @Override
            public void onRemoval(final RemovalNotification<K, V> notification) {
                executor.execute(new Runnable() {
                    @Override
                    public void run() {
                        listener.onRemoval(notification);
                    }
                });
            }
        };
    }

}