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/**
 * Copyright (c) 2015-2017, Winter Lau ([email protected]).
 * 
 * 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 net.oschina.j2cache.mybatis;

import net.oschina.j2cache.CacheChannel;
import net.oschina.j2cache.J2Cache;
import org.apache.ibatis.cache.Cache;

import java.util.Collection;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

/**
 * 实现了 MyBatis 的缓存接口
 * @author Winter Lau ([email protected])
 */
public class J2CacheAdapter implements Cache {

    private static final String DEFAULT_REGION = "default";

    private final ReadWriteLock readWriteLock = new ReentrantReadWriteLock();
    private CacheChannel cache = J2Cache.getChannel();
    private String id;

    public J2CacheAdapter(String id) {
        if (id == null)
            id = DEFAULT_REGION;
        this.id = id;
    }

    public void setId(String id) {
        if (id == null)
            id = DEFAULT_REGION;
        this.id = id;
    }

    @Override
    public String getId() {
        return this.id;
    }

    @Override
    public void putObject(Object o, Object o1) {
        this.cache.set(this.id, o.toString(), o1);
    }

    @Override
    public Object getObject(Object key) {
        return this.cache.get(this.id, key.toString()).getValue();
    }

    @Override
    public Object removeObject(Object o) {
        Object obj = this.cache.get(this.id, o.toString()).getValue();
        if (obj != null)
            this.cache.evict(this.id, o.toString());
        return obj;
    }

    @Override
    public void clear() {
        this.cache.clear(this.getId());
    }

    @Override
    public int getSize() {
        Collection keys = this.cache.keys(this.getId());
        return keys != null ? keys.size() : 0;
    }

    @Override
    public ReadWriteLock getReadWriteLock() {
        return this.readWriteLock;
    }
}