com.glaf.j2cache.mongodb.MongodbCache.java Source code

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Here is the source code for com.glaf.j2cache.mongodb.MongodbCache.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.j2cache.mongodb;

import java.util.List;

import org.bson.Document;

import com.glaf.j2cache.CacheException;

import com.glaf.core.container.MongodbContainer;
import com.mongodb.BasicDBObject;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;

public class MongodbCache implements com.glaf.j2cache.Cache {

    protected MongoCollection<Document> dbCollection;

    protected MongoDatabase db;

    protected String servers;

    protected int cacheSize = 100000;

    protected int expireMinutes = 30;

    public MongodbCache(String servers, int cacheSize, int expireMinutes) {
        this.servers = servers;
        this.cacheSize = cacheSize;
        this.expireMinutes = expireMinutes;
        this.buildClient();
    }

    protected void buildClient() {
        db = MongodbContainer.getInstance().getDatabase("cachedb");
        dbCollection = db.getCollection("collection");
    }

    public void clear() throws CacheException {
        dbCollection.drop();
    }

    public void destroy() throws CacheException {
        dbCollection.drop();
        db.drop();
    }

    @SuppressWarnings("rawtypes")
    public void evict(List keys) throws CacheException {
        if (keys != null && !keys.isEmpty()) {
            BasicDBObject filter = new BasicDBObject();
            for (Object key : keys) {
                filter.put("key", key);
                dbCollection.deleteOne(filter);
            }
        }
    }

    public void evict(Object key) throws CacheException {
        BasicDBObject filter = new BasicDBObject();
        filter.put("key", key);
        dbCollection.deleteOne(filter);
    }

    public Object get(Object key) throws CacheException {
        BasicDBObject filter = new BasicDBObject();
        filter.put("key", key);
        MongoCursor<Document> cur = dbCollection.find(filter).iterator();
        long now = System.currentTimeMillis();
        Object value = null;
        try {
            while (cur.hasNext()) {
                Document doc = cur.next();
                value = doc.get(key.toString());
                long saveTime = (Long) doc.get("time");
                if ((now - saveTime) > expireMinutes * 60000) {
                    /**
                     * ?
                     */
                    dbCollection.deleteOne(filter);
                }
            }
        } finally {
            cur.close();
        }
        return value;
    }

    public int getCacheSize() {
        return cacheSize;
    }

    public int getExpireMinutes() {
        return expireMinutes;
    }

    public List<?> keys() throws CacheException {
        return null;
    }

    public void put(Object key, Object value) throws CacheException {
        Document doc = new Document();
        doc.put("key", key);
        doc.put(key.toString(), value);
        doc.put("time", System.currentTimeMillis());
        dbCollection.insertOne(doc);
    }

    public void setCacheSize(int cacheSize) {
        this.cacheSize = cacheSize;
    }

    public void setExpireMinutes(int expireMinutes) {
        this.expireMinutes = expireMinutes;
    }

    public void update(Object key, Object value) throws CacheException {
        Document doc = new Document();
        doc.put("key", key);
        doc.put(key.toString(), value);
        doc.put("time", System.currentTimeMillis());
        dbCollection.insertOne(doc);
    }

}