org.metaservice.core.utils.MongoCache.java Source code

Java tutorial

Introduction

Here is the source code for org.metaservice.core.utils.MongoCache.java

Source

/*
 * Copyright 2015 Nikola Ilo
 *
 * 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.metaservice.core.utils;

import com.mongodb.*;
import org.apache.commons.codec.digest.DigestUtils;
import org.bson.types.ObjectId;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.net.UnknownHostException;
import java.util.Arrays;
import java.util.Date;

public class MongoCache {
    private static Logger LOGGER = LoggerFactory.getLogger(MongoCache.class);
    private MongoClient client;
    private DB db;
    private DBCollection collection;
    private DBCollection fileCollection;

    public MongoCache() {
        this("metaservice.org", "crawlcache", "nilo", "alokin");
    }

    public MongoCache(@NotNull String address, @NotNull String database, @NotNull String username,
            @NotNull String password) {
        try {
            MongoCredential credential = MongoCredential.createMongoCRCredential(username, database,
                    password.toCharArray());
            client = new MongoClient(new ServerAddress(address), Arrays.asList(credential));
            db = client.getDB(database);
            db.authenticate(username, password.toCharArray());
            collection = db.getCollection("debiansnapshot");
            fileCollection = db.getCollection("files");
            collection.ensureIndex("uri");
            fileCollection.ensureIndex("md5");
        } catch (UnknownHostException e) {
            throw new RuntimeException(e);
        }
    }

    public @Nullable String get(String accessType, @NotNull String path) {
        DBObject query = new BasicDBObject();
        query.put("uri", path);
        DBObject result = collection.findOne(query);
        if (result != null && result.get("content") != null) {
            LOGGER.info("CACHE HIT");
            return (String) result.get("content");
        } else
            return null;
    }

    public void put(String accessType, @NotNull String path, @NotNull String result) {
        DBObject object = new BasicDBObject();
        object.put("uri", path);
        object.put("type", "GET");
        object.put("format", "text");
        object.put("date", new Date());
        object.put("content", result);
        collection.insert(object);
        LOGGER.info("NO CACHE HIT");
    }

    public @Nullable byte[] getByte(String accessType, @NotNull String path) {

        /*
        DBObject query = new BasicDBObject();
        query.put("uri", path);
        DBObject result = collection.findOne(query);
        if(result != null){
        ObjectId entry = (ObjectId) result.get("contentId");
        result = fileCollection.findOne(entry);
        if(result != null && result.get("content")!=null)
        {
            LOGGER.info("CACHE HIT");
            return (byte[]) result.get("content");
        }
        }*/
        //cache is broken :-(
        // too big files
        return null;
    }

    /**
     * DEDUP :-)
     * @param accessType
     * @param path
     * @param data
     */
    public void putByte(String accessType, @NotNull String path, @NotNull byte[] data) {
        /*   DBObject object = new BasicDBObject();
           object.put("uri",path);
           object.put("type","GET");
           object.put("format","byte");
           object.put("date",new Date());
            
           //get Correct file reference
           String md5 = DigestUtils.md5Hex(data);
           DBObject query = new BasicDBObject();
           query.put("md5",md5);
           LOGGER.info("Storing {} md5:{}", path, md5);
            
           DBObject result = fileCollection.findOne(query);
           if(result != null){
        LOGGER.info("already found - only adding reference");
        object.put("contentId",result.get("_id"));
           } else {
        LOGGER.info("not found - adding file completely");
        if(data.length > 16777215) //MAX BSON SIZE
        {
            LOGGER.warn("Couldn't add file because larger then max bson size");
            return;
        }
        DBObject file = new BasicDBObject();
        file.put("content",data);
        file.put("md5",md5);
        fileCollection.insert(file);
        ObjectId id =  (ObjectId)file.get( "_id" );
        object.put("contentId",id);
           }
           collection.insert(object);*/
    }

    public boolean isCached(String uri) {
        DBObject query = new BasicDBObject();
        query.put("uri", uri);
        DBObject result = collection.findOne(query);
        return (result != null);
    }
}