/*
* 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.flink.core.fs;
import org.apache.flink.annotation.Internal;
import org.apache.flink.util.AbstractCloseableRegistry;
import java.io.Closeable;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
/**
* This class allows to register instances of {@link Closeable}, which are all closed if this registry is closed.
* <p>
* Registering to an already closed registry will throw an exception and close the provided {@link Closeable}
* <p>
* All methods in this class are thread-safe.
*/
@Internal
public class CloseableRegistry extends AbstractCloseableRegistry<Closeable, Object> {
private static final Object DUMMY = new Object();
public CloseableRegistry() {
super(new HashMap<Closeable, Object>());
}
@Override
protected void doRegister(Closeable closeable, Map<Closeable, Object> closeableMap) throws IOException {
closeableMap.put(closeable, DUMMY);
}
@Override
protected void doUnRegister(Closeable closeable, Map<Closeable, Object> closeableMap) {
closeableMap.remove(closeable);
}
}