org.beetl.sql.clazz.kit.ThreadSafeCaseInsensitiveHashMap Maven / Gradle / Ivy
package org.beetl.sql.clazz.kit;
import java.util.Map;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
/**
* 线程安全的hashMap
*
* @author xiandafu
*/
public class ThreadSafeCaseInsensitiveHashMap extends CaseInsensitiveHashMap {
private static final long serialVersionUID = 9178606903603606032L;
final ReentrantReadWriteLock rwl = new ReentrantReadWriteLock();
private final Lock r = rwl.readLock();
private final Lock w = rwl.writeLock();
@Override
public boolean containsKey(Object key) {
r.lock();
try {
return super.containsKey(key);
} finally {
r.unlock();
}
}
@Override
public Object get(Object key) {
r.lock();
try {
return super.get(key);
} finally {
r.unlock();
}
}
@Override
public Object put(String key, Object value) {
/*
* 保持map和lowerCaseMap同步 在put新值之前remove旧的映射关系
*/
w.lock();
try {
return super.put(key, value);
} finally {
w.unlock();
}
}
@Override
public void putAll(Map m) {
w.lock();
try {
super.putAll(m);
} finally {
w.unlock();
}
}
@Override
public Object remove(Object key) {
w.lock();
try {
return super.remove(key);
} finally {
w.unlock();
}
}
}