/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.common.lease;
import org.elasticsearch.ElasticsearchException;
import java.util.Arrays;
/** Utility methods to work with {@link Releasable}s. */
public enum Releasables {
;
private static void rethrow(Throwable t) {
if (t instanceof RuntimeException) {
throw (RuntimeException) t;
}
if (t instanceof Error) {
throw (Error) t;
}
throw new RuntimeException(t);
}
private static void close(Iterable<? extends Releasable> releasables, boolean ignoreException) {
Throwable th = null;
for (Releasable releasable : releasables) {
if (releasable != null) {
try {
releasable.close();
} catch (Throwable t) {
if (th == null) {
th = t;
}
}
}
}
if (th != null && !ignoreException) {
rethrow(th);
}
}
/** Release the provided {@link Releasable}s. */
public static void close(Iterable<? extends Releasable> releasables) {
close(releasables, false);
}
/** Release the provided {@link Releasable}s. */
public static void close(Releasable... releasables) {
close(Arrays.asList(releasables));
}
/** Release the provided {@link Releasable}s, ignoring exceptions. */
public static void closeWhileHandlingException(Iterable<Releasable> releasables) {
close(releasables, true);
}
/** Release the provided {@link Releasable}s, ignoring exceptions. */
public static void closeWhileHandlingException(Releasable... releasables) {
closeWhileHandlingException(Arrays.asList(releasables));
}
/** Release the provided {@link Releasable}s, ignoring exceptions if <code>success</code> is <tt>false</tt>. */
public static void close(boolean success, Iterable<Releasable> releasables) {
if (success) {
close(releasables);
} else {
closeWhileHandlingException(releasables);
}
}
/** Release the provided {@link Releasable}s, ignoring exceptions if <code>success</code> is <tt>false</tt>. */
public static void close(boolean success, Releasable... releasables) {
close(success, Arrays.asList(releasables));
}
/** Wrap several releasables into a single one. This is typically useful for use with try-with-resources: for example let's assume
* that you store in a list several resources that you would like to see released after execution of the try block:
*
* <pre>
* List<Releasable> resources = ...;
* try (Releasable releasable = Releasables.wrap(resources)) {
* // do something
* }
* // the resources will be released when reaching here
* </pre>
*/
public static Releasable wrap(final Iterable<Releasable> releasables) {
return new Releasable() {
@Override
public void close() {
Releasables.close(releasables);
}
};
}
/** @see #wrap(Iterable) */
public static Releasable wrap(final Releasable... releasables) {
return new Releasable() {
@Override
public void close() {
Releasables.close(releasables);
}
};
}
}