org.apache.reef.io.network.naming.NameCache.java Source code

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Here is the source code for org.apache.reef.io.network.naming.NameCache.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.reef.io.network.naming;

import com.google.common.cache.CacheBuilder;
import org.apache.reef.io.network.Cache;
import org.apache.reef.wake.Identifier;

import java.net.InetSocketAddress;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;

/**
 * Naming cache implementation
 */
public class NameCache implements Cache<Identifier, InetSocketAddress> {

    private final com.google.common.cache.Cache<Identifier, InetSocketAddress> cache;

    /**
     * Constructs a naming cache
     *
     * @param timeout a cache entry timeout after access
     */
    public NameCache(long timeout) {
        cache = CacheBuilder.newBuilder().expireAfterWrite(timeout, TimeUnit.MILLISECONDS).build();
    }

    /**
     * Gets an address for an identifier
     *
     * @param key          an identifier
     * @param valueFetcher a callable to load a value for the corresponding identifier
     * @return an Internet socket address
     * @throws ExecutionException
     */
    @Override
    public InetSocketAddress get(Identifier key, Callable<InetSocketAddress> valueFetcher)
            throws ExecutionException {
        return cache.get(key, valueFetcher);
    }

    /**
     * Invalidates the entry for an identifier
     *
     * @param key an identifier
     */
    @Override
    public void invalidate(Identifier key) {
        cache.invalidate(key);
    }

}