MemCachedSecondCacheImpl.java

/**
 * Copyright 2014 Duan Bingnan
 * 
 * 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.pinus4j.cache.impl;

import java.util.List;
import java.util.Random;

import org.pinus4j.cache.ISecondCache;
import org.pinus4j.cluster.resources.ShardingDBResource;
import org.pinus4j.utils.SecurityUtil;
import org.pinus4j.utils.StringUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MemCachedSecondCacheImpl extends AbstractMemCachedCache implements ISecondCache {

    /**
     * 日志.
     */
    public static final Logger  LOG = LoggerFactory.getLogger(MemCachedSecondCacheImpl.class);

    private static final Random r   = new Random();

    /**
     * 构造方法.
     * 
     * @param servers ip:port,ip:port
     */
    public MemCachedSecondCacheImpl(String s, int expire) {
        super(s, expire);
    }

    @Override
    public void putGlobal(String whereKey, String clusterName, String tableName, List data) {
        if (StringUtil.isBlank(whereKey) || data == null || data.isEmpty()) {
            return;
        }

        try {
            String versionKey = _buildGlobalVersion(clusterName, tableName);
            int version = r.nextInt(10000);
            if (!_exists(versionKey)) {
                this.memClient.incr(versionKey, 0, version);
            } else {
                version = Integer.parseInt((String) this.memClient.get(versionKey));
            }

            String cacheKey = _buildGlobalCacheKey(whereKey, clusterName, tableName, version);
            this.memClient.set(cacheKey, expire, data);

            if (LOG.isDebugEnabled()) {
                LOG.debug("[SECOND CACHE] - put to cache done, key: " + cacheKey);
            }
        } catch (Exception e) {
            LOG.warn("operate second cache failure");
        }
    }

    @Override
    public List getGlobal(String whereKey, String clusterName, String tableName) {
        if (StringUtil.isBlank(whereKey)) {
            return null;
        }

        try {
            String versionKey = _buildGlobalVersion(clusterName, tableName);
            if (_exists(versionKey)) {
                int version = Integer.parseInt((String) this.memClient.get(versionKey));

                String cacheKey = _buildGlobalCacheKey(whereKey, clusterName, tableName, version);
                List data = (List) this.memClient.get(cacheKey);

                if (LOG.isDebugEnabled() && data != null) {
                    LOG.debug("[SECOND CACHE] -  key " + cacheKey + " hit");
                }

                return data;
            }
        } catch (Exception e) {
            LOG.warn("operate second cache failure");
        }

        return null;
    }

    @Override
    public void removeGlobal(String clusterName, String tableName) {
        String versionKey = _buildGlobalVersion(clusterName, tableName);
        if (_exists(versionKey)) {
            this.memClient.incr(versionKey, 1);
            if (LOG.isDebugEnabled()) {
                LOG.debug("[SECOND CACHE] - " + versionKey + " clean");
            }
        }
    }

    @Override
    public void put(String whereKey, ShardingDBResource db, List data) {
        if (StringUtil.isBlank(whereKey) || data == null || data.isEmpty()) {
            return;
        }

        try {
            String versionKey = _buildShardingVersion(db);
            int version = r.nextInt(10000);
            if (!_exists(versionKey)) {
                this.memClient.incr(versionKey, 0, version);
            } else {
                version = Integer.parseInt((String) this.memClient.get(versionKey));
            }

            String cacheKey = _buildShardingCacheKey(whereKey, db, version);
            this.memClient.set(cacheKey, expire, data);

            if (LOG.isDebugEnabled()) {
                LOG.debug("[SECOND CACHE] - put to cache done, key: " + cacheKey);
            }
        } catch (Exception e) {
            LOG.warn("operate second cache failure");
        }
    }

    @Override
    public List get(String whereKey, ShardingDBResource db) {
        if (StringUtil.isBlank(whereKey)) {
            return null;
        }

        try {
            String versionKey = _buildShardingVersion(db);

            if (_exists(versionKey)) {
                int version = Integer.parseInt((String) this.memClient.get(versionKey));

                String cacheKey = _buildShardingCacheKey(whereKey, db, version);
                List data = (List) this.memClient.get(cacheKey);

                if (LOG.isDebugEnabled() && data != null) {
                    LOG.debug("[SECOND CACHE] -  key " + cacheKey + " hit");
                }

                return data;
            }
        } catch (Exception e) {
            LOG.warn("operate second cache failure");
        }

        return null;
    }

    @Override
    public void remove(ShardingDBResource db) {
        String versionKey = _buildShardingVersion(db);
        if (_exists(versionKey)) {
            this.memClient.incr(versionKey, 1);
            if (LOG.isDebugEnabled()) {
                LOG.debug("[SECOND CACHE] - " + versionKey + " clean");
            }
        }
    }

    private boolean _exists(String key) {
        return this.memClient.get(key) != null;
    }

    private String _buildGlobalVersion(String clusterName, String tableName) {
        StringBuilder versionKey = new StringBuilder("sec.version.");
        versionKey.append(clusterName).append(".");
        versionKey.append(tableName);
        versionKey.append(".");
        versionKey.append(getCacheVersion(tableName));
        return versionKey.toString();
    }

    public String _buildShardingVersion(ShardingDBResource shardingDBResource) {
        StringBuilder versionKey = new StringBuilder("sec.version.");
        versionKey.append(shardingDBResource.getClusterName());
        versionKey.append(".");
        versionKey.append(shardingDBResource.getDbName());
        versionKey.append(".");
        versionKey.append(shardingDBResource.getRegionCapacity());
        versionKey.append(".");
        versionKey.append(shardingDBResource.getTableName()).append(shardingDBResource.getTableIndex());
        versionKey.append(".");
        versionKey.append(getCacheVersion(shardingDBResource.getTableName()));
        return versionKey.toString();
    }

    /**
     * global second cache key. sec.[clustername].[tablename].[version].hashCode
     */
    private String _buildGlobalCacheKey(String whereKey, String clusterName, String tableName, int version) {
        StringBuilder cacheKey = new StringBuilder("sec.");
        cacheKey.append(clusterName).append(".");
        cacheKey.append(tableName).append(".");
        cacheKey.append(getCacheVersion(tableName)).append(".");
        cacheKey.append(version).append(".");
        cacheKey.append(SecurityUtil.md5(whereKey));
        return cacheKey.toString();
    }

    /**
     * sharding second cache key. sec.[clustername].[startend].[tablename +
     * tableIndex].[version].hashCode
     */
    private String _buildShardingCacheKey(String whereKey, ShardingDBResource shardingDBResource, int version) {
        StringBuilder cacheKey = new StringBuilder("sec.");
        cacheKey.append(shardingDBResource.getClusterName());
        cacheKey.append(".");
        cacheKey.append(shardingDBResource.getDbName());
        cacheKey.append(".");
        cacheKey.append(shardingDBResource.getRegionCapacity());
        cacheKey.append(".");
        cacheKey.append(shardingDBResource.getTableName()).append(shardingDBResource.getTableIndex());
        cacheKey.append(".");
        cacheKey.append(getCacheVersion(shardingDBResource.getTableName()));
        cacheKey.append(".");
        cacheKey.append(version).append(".");
        cacheKey.append(SecurityUtil.md5(whereKey));
        return cacheKey.toString();
    }

}