RedisBusDAO.java

/*
 * Copyright 2012 Janrain, Inc.
 *
 * 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 com.janrain.backplane2.server.dao.redis;

import com.janrain.backplane.common.BackplaneServerException;
import com.janrain.backplane2.server.config.BusConfig2;
import com.janrain.backplane2.server.dao.BusDAO;
import com.janrain.backplane2.server.dao.GrantDAO;
import com.janrain.oauth2.TokenException;
import com.janrain.redis.Redis;
import org.apache.commons.lang.SerializationUtils;
import org.apache.log4j.Logger;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.Response;
import redis.clients.jedis.Transaction;

import java.util.ArrayList;
import java.util.List;

/**
 * @author Johnny Bufu
 */
public class RedisBusDAO implements BusDAO {

    public RedisBusDAO(GrantDAO grantDao) {
        this.grantDao = grantDao;
    }

    public static byte[] getKey(String id) {
        return ("v2_bus_" + id).getBytes();
    }

    @Override
    public List<BusConfig2> retrieveByOwner(String busOwner) throws BackplaneServerException {
        List<BusConfig2> buses = getAll();
        List<BusConfig2> filtered = new ArrayList<BusConfig2>();
        for (BusConfig2 busConfig : buses) {
            if (busOwner.equals(busConfig.get(BusConfig2.Field.OWNER))) {
                filtered.add(busConfig);
            }
        }
        return filtered;
    }

    @Override
    public void deleteByOwner(String busOwner) throws BackplaneServerException {
        List<BusConfig2> buses = getAll();
        for (BusConfig2 busConfig: buses) {
            if (busOwner.equals(busConfig.get(BusConfig2.Field.OWNER))) {
                delete(busConfig.getIdValue());
            }
        }
    }

    @Override
    public BusConfig2 get(String id) throws BackplaneServerException {
        byte[] bytes = Redis.getInstance().get(getKey(id));
        if (bytes != null) {
            return (BusConfig2) SerializationUtils.deserialize(bytes);
        } else {
            return null;
        }
    }

    @Override
    public List<BusConfig2> getAll() throws BackplaneServerException {
        List<BusConfig2> buses = new ArrayList<BusConfig2>();
        List<byte[]> bytesList = Redis.getInstance().lrange(getKey("list"), 0, -1);
        for (byte[] bytes : bytesList) {
            if (bytes != null) {
                buses.add((BusConfig2) SerializationUtils.deserialize(bytes));
            }
        }
        return buses;
    }

    @Override
    public void persist(BusConfig2 obj) throws BackplaneServerException {
        byte[] bytes = SerializationUtils.serialize(obj);
        Redis.getInstance().rpush(getKey("list"), bytes);
        Redis.getInstance().set(getKey(obj.getIdValue()), bytes);
    }

    @Override
    public void delete(final String id) throws BackplaneServerException {
        Jedis jedis = null;
        try {
            logger.info("==== BEGIN BUS " + id + " DELETE ====");
            jedis = Redis.getInstance().getWriteJedis();
            byte[] bytes = jedis.get(getKey(id));
            if (bytes != null) {
                Transaction t = jedis.multi();
                Response<Long> del1 = t.lrem(getKey("list"), 0, bytes);
                Response<Long> del2 = t.del(getKey(id));
                t.exec();

                if (del1.get() == 0) {
                    logger.warn("could not delete bus " + new String(getKey(id)) + " from list " + new String(getKey("list")));
                }
                if (del2.get() == 0) {
                    logger.warn("could not delete bus key " + new String(getKey(id)));
                }
            }
            // cleanup related grants
            grantDao.deleteByBuses(new ArrayList<String>() {{add(id);}});
            logger.info("Bus " + id + " deleted successfully");
            logger.info("==== END BUS DELETE ====");
        } catch (TokenException e) {
            throw new BackplaneServerException("Error deleting buses: " + e.getMessage(), e);
        } finally {
            Redis.getInstance().releaseToPool(jedis);
        }
    }

    // PRIVATE

    private static final Logger logger = Logger.getLogger(RedisClientDAO.class);

    private final GrantDAO grantDao;
}