curator-master/curator-client/src/main/java/org/apache/curator/utils/CloseableUtils.java
/*
 * 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.curator.utils;

import com.google.common.io.Closeables;
import java.io.Closeable;
import java.io.IOException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * This class adds back functionality that was removed in Guava v16.0.
 */
public class CloseableUtils {
    private static final Logger log = LoggerFactory.getLogger(CloseableUtils.class);

    /**
     * <p>
     * This method has been added because Guava has removed the
     * {@code closeQuietly()} method from {@code Closeables} in v16.0. It's
     * tempting simply to replace calls to {@code closeQuietly(closeable)}
     * with calls to {@code close(closeable, true)} to close
     * {@code Closeable}s while swallowing {@code IOException}s, but
     * {@code close()} is declared as {@code throws IOException} whereas
     * {@code closeQuietly()} is not, so it's not a drop-in replacement.
     * </p>
     * <p>
     * On the whole, Guava is very backwards compatible. By fixing this nit,
     * Curator can continue to support newer versions of Guava without having
     * to bump its own dependency version.
     * </p>
     * <p>
     * See <a href="https://issues.apache.org/jira/browse/CURATOR-85">https://issues.apache.org/jira/browse/CURATOR-85</a>
     * </p>
     */
    public static void closeQuietly(Closeable closeable) {
        try {
            // Here we've instructed Guava to swallow the IOException
            Closeables.close(closeable, true);
        } catch (IOException e) {
            // We instructed Guava to swallow the IOException, so this should
            // never happen. Since it did, log it.
            log.error("IOException should not have been thrown.", e);
        }
    }
}
