com.glaf.shiro.cache.zookeeper.ZooKeeperCache.java Source code

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Here is the source code for com.glaf.shiro.cache.zookeeper.ZooKeeperCache.java

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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 com.glaf.shiro.cache.zookeeper;

import java.util.Collection;
import java.util.List;
import java.util.Set;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.curator.framework.CuratorFramework;
import org.apache.shiro.cache.Cache;
import org.apache.shiro.cache.CacheException;
import org.apache.zookeeper.CreateMode;
import org.springframework.util.SerializationUtils;

public class ZooKeeperCache<K, V> implements Cache<K, V> {

    private static final Log logger = LogFactory.getLog(ZooKeeperCache.class);

    private volatile CuratorFramework zkClient;

    private volatile String groupName;

    public ZooKeeperCache(String groupName, CuratorFramework zkClient) {
        if (zkClient == null) {
            throw new IllegalArgumentException("zkClient argument cannot be null.");
        }
        if (groupName == null) {
            throw new IllegalArgumentException("groupName argument cannot be null.");
        }
        this.zkClient = zkClient;
        this.groupName = groupName;
    }

    public void clear() throws CacheException {
        try {
            List<String> children = zkClient.getChildren().forPath(groupName);
            if (children != null && !children.isEmpty()) {
                for (String child : children) {
                    logger.debug("cache key:" + child);
                    zkClient.delete().inBackground().forPath(child);
                }
            }
        } catch (Exception ex) {
            ex.printStackTrace();
            if (logger.isDebugEnabled()) {
                logger.debug(ex);
            }
        }
    }

    @SuppressWarnings("unchecked")
    public V get(K key) throws CacheException {
        try {
            String path = groupName + "/" + key;
            logger.debug("cache key:" + path);
            byte[] bytes = zkClient.getData().forPath(path);
            return (V) SerializationUtils.deserialize(bytes);
        } catch (Exception ex) {
            ex.printStackTrace();
            if (logger.isDebugEnabled()) {
                logger.debug(ex);
            }
        }
        return null;
    }

    public Set<K> keys() {
        return null;
    }

    public V put(K key, V value) throws CacheException {
        byte[] data = SerializationUtils.serialize(value);
        try {
            String path = groupName + "/" + key;
            logger.debug("cache key:" + path);
            zkClient.create().withMode(CreateMode.PERSISTENT).forPath(path, data);
        } catch (Exception ex) {
            ex.printStackTrace();
            if (logger.isDebugEnabled()) {
                logger.debug(ex);
            }
        }
        return null;
    }

    public V remove(K key) throws CacheException {
        try {
            String path = groupName + "/" + key;
            logger.debug("cache key:" + path);
            zkClient.delete().inBackground().forPath(path);
        } catch (Exception ex) {
            ex.printStackTrace();
            if (logger.isDebugEnabled()) {
                logger.debug(ex);
            }
        }
        return null;
    }

    public int size() {
        return 0;
    }

    public Collection<V> values() {
        return null;
    }

}