org.gitective.redis.RedisRefTable.java Source code

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Here is the source code for org.gitective.redis.RedisRefTable.java

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/*
 * Copyright (c) 2011 Kevin Sawicki <kevinsawicki@gmail.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */
package org.gitective.redis;

import com.google.protobuf.InvalidProtocolBufferException;

import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.TimeoutException;

import org.eclipse.jgit.generated.storage.dht.proto.GitStore.RefData;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.storage.dht.DhtException;
import org.eclipse.jgit.storage.dht.RefDataUtil;
import org.eclipse.jgit.storage.dht.RefKey;
import org.eclipse.jgit.storage.dht.RepositoryKey;
import org.eclipse.jgit.storage.dht.spi.Context;
import org.eclipse.jgit.storage.dht.spi.RefTable;
import org.eclipse.jgit.storage.dht.spi.util.ColumnMatcher;
import org.eclipse.jgit.util.RawParseUtils;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;

/**
 * Redis-backed ref table
 */
public class RedisRefTable extends RedisClient implements RefTable {

    private static final ColumnMatcher REFS = new ColumnMatcher("refs:");

    /**
     * 
     */
    public RedisRefTable() {
        super();
    }

    /**
     * @param provider
     */
    public RedisRefTable(ConnectionProvider provider) {
        super(provider);
    }

    /**
     * @param pool
     */
    public RedisRefTable(JedisPool pool) {
        super(pool);
    }

    public Map<RefKey, RefData> getAll(Context options, RepositoryKey repository)
            throws DhtException, TimeoutException {
        Jedis jedis = acquire();
        try {
            Map<byte[], byte[]> values = jedis.hgetAll(REFS.append(repository.asBytes()));
            Map<RefKey, RefData> out = new HashMap<RefKey, RefData>(values.size());
            for (Entry<byte[], byte[]> value : values.entrySet())
                out.put(RefKey.create(repository, RawParseUtils.decode(value.getKey())),
                        RefData.parseFrom(value.getValue()));
            return out;
        } catch (InvalidProtocolBufferException e) {
            throw new DhtException(e);
        } finally {
            release(jedis);
        }
    }

    /**
     * Is current
     * 
     * @param ref
     * @param key
     * @param oldData
     * @param jedis
     * @return true if change, false otherwse
     */
    protected boolean equal(byte[] ref, byte[] key, RefData oldData, Jedis jedis) {
        byte[] oldBytes = oldData != RefDataUtil.NONE ? oldData.toByteArray() : null;
        return equal(oldBytes, jedis.hget(key, ref));
    }

    public boolean compareAndPut(RefKey refKey, RefData oldData, RefData newData)
            throws DhtException, TimeoutException {
        Jedis jedis = acquire();
        try {
            byte[] ref = Constants.encode(refKey.getName());
            byte[] key = REFS.append(refKey.getRepositoryKey().asBytes());
            boolean same = equal(ref, key, oldData, jedis);
            if (same)
                jedis.hset(key, ref, newData.toByteArray());
            return same;
        } finally {
            release(jedis);
        }
    }

    public boolean compareAndRemove(RefKey refKey, RefData oldData) throws DhtException, TimeoutException {
        Jedis jedis = acquire();
        try {
            byte[] ref = Constants.encode(refKey.getName());
            byte[] key = REFS.append(refKey.getRepositoryKey().asBytes());
            boolean same = equal(ref, key, oldData, jedis);
            if (same)
                jedis.hdel(key, ref);
            return same;
        } finally {
            release(jedis);
        }
    }
}