diff options
author | Zhaoxing <meng.zhaoxing1@zte.com.cn> | 2017-08-08 14:02:53 +0800 |
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committer | Zhaoxing <meng.zhaoxing1@zte.com.cn> | 2017-08-08 14:02:53 +0800 |
commit | c0604184b2aa8cff924ca783ec6b36f1f5988775 (patch) | |
tree | 1c70ffe1ad90c915b3382a37eb2fa80901519c7b /wso2/wso2bpel-ext/wso2bpel-core/wso2bpel-mgr/src/main/java/org/openo/carbon/bpel/util/LRULinkedHashMap.java | |
parent | 706fc9fed496972968fde136c3e4e10f9578a5b3 (diff) |
init code
Change-Id: Icd0948118397b256da70dfbcbbec5520dc5eafd4
Signed-off-by: Zhaoxing <meng.zhaoxing1@zte.com.cn>
Diffstat (limited to 'wso2/wso2bpel-ext/wso2bpel-core/wso2bpel-mgr/src/main/java/org/openo/carbon/bpel/util/LRULinkedHashMap.java')
-rw-r--r-- | wso2/wso2bpel-ext/wso2bpel-core/wso2bpel-mgr/src/main/java/org/openo/carbon/bpel/util/LRULinkedHashMap.java | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/wso2/wso2bpel-ext/wso2bpel-core/wso2bpel-mgr/src/main/java/org/openo/carbon/bpel/util/LRULinkedHashMap.java b/wso2/wso2bpel-ext/wso2bpel-core/wso2bpel-mgr/src/main/java/org/openo/carbon/bpel/util/LRULinkedHashMap.java new file mode 100644 index 0000000..deb07c6 --- /dev/null +++ b/wso2/wso2bpel-ext/wso2bpel-core/wso2bpel-mgr/src/main/java/org/openo/carbon/bpel/util/LRULinkedHashMap.java @@ -0,0 +1,106 @@ +/** + * Copyright 2016 ZTE Corporation. + * + * Licensed 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.openo.carbon.bpel.util; + +import java.util.ArrayList; +import java.util.Collection; +import java.util.LinkedHashMap; +import java.util.Map; +import java.util.concurrent.locks.Lock; +import java.util.concurrent.locks.ReentrantLock; + +/** + * + * @author bsli + * + * @param <K> + * @param <V> + */ +@SuppressWarnings("serial") +public class LRULinkedHashMap<K, V> extends LinkedHashMap<K, V> { + private final int maxCapacity; + + private static final float DEFAULT_LOAD_FACTOR = 0.75f; + + private final Lock lock = new ReentrantLock(); + + public LRULinkedHashMap(int maxCapacity) { + super(maxCapacity, DEFAULT_LOAD_FACTOR, true); + this.maxCapacity = maxCapacity; + } + + @Override + protected boolean removeEldestEntry(java.util.Map.Entry<K, V> eldest) { + return size() > maxCapacity; + } + + @Override + public boolean containsKey(Object key) { + try { + lock.lock(); + return super.containsKey(key); + } finally { + lock.unlock(); + } + } + + @Override + public V get(Object key) { + try { + lock.lock(); + return super.get(key); + } finally { + lock.unlock(); + } + } + + @Override + public V put(K key, V value) { + try { + lock.lock(); + return super.put(key, value); + } finally { + lock.unlock(); + } + } + + public int size() { + try { + lock.lock(); + return super.size(); + } finally { + lock.unlock(); + } + } + + public void clear() { + try { + lock.lock(); + super.clear(); + } finally { + lock.unlock(); + } + } + + public Collection<Map.Entry<K, V>> getAll() { + try { + lock.lock(); + return new ArrayList<Map.Entry<K, V>>(super.entrySet()); + } finally { + lock.unlock(); + } + } +} |