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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.tuscany.sca.contribution.service.util;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
public class ConcurrentHashList <K,T> {
private Map<K, List<T>> hashList;
public ConcurrentHashList() {
hashList = new ConcurrentHashMap<K, List<T>>();
}
public ConcurrentHashList(int initialCapacity) {
hashList = new ConcurrentHashMap<K, List<T>>(initialCapacity);
}
public void clear() {
hashList.clear();
}
public List<T> get(K key) {
List<T> resultList = hashList.get(key);
if( resultList == null) {
resultList = new ArrayList<T>();
hashList.put(key, resultList);
}
return resultList;
}
public boolean isEmpty() {
return hashList.isEmpty();
}
public T put(K key, T value) {
this.get(key).add(value);
return value;
}
public int size() {
return hashList.size();
}
public static void main(String args[]) {
ConcurrentHashList<String, String> list = new ConcurrentHashList<String, String>();
list.put("a", "a1");
list.put("a", "a2");
list.put("a", "a3");
for(String s : list.get("a")) {
System.out.println("Key a - " + s);
}
}
}
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