org.gitective.mongo.MongoRepositoryTable.java Source code

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Here is the source code for org.gitective.mongo.MongoRepositoryTable.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.mongo;

import static org.gitective.mongo.IPropertyConstants.CHUNKS;
import static org.gitective.mongo.IPropertyConstants.KEY;
import static org.gitective.mongo.IPropertyConstants.METADATA;
import static org.gitective.mongo.IPropertyConstants.PACKS;

import com.google.protobuf.InvalidProtocolBufferException;
import com.mongodb.BasicDBObject;
import com.mongodb.DBCollection;
import com.mongodb.DBObject;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.TimeoutException;

import org.eclipse.jgit.generated.storage.dht.proto.GitStore.CachedPackInfo;
import org.eclipse.jgit.storage.dht.CachedPackKey;
import org.eclipse.jgit.storage.dht.ChunkInfo;
import org.eclipse.jgit.storage.dht.ChunkKey;
import org.eclipse.jgit.storage.dht.DhtException;
import org.eclipse.jgit.storage.dht.RepositoryKey;
import org.eclipse.jgit.storage.dht.spi.RepositoryTable;
import org.eclipse.jgit.storage.dht.spi.WriteBuffer;

/**
 * MongoDB-backed repository table
 */
public class MongoRepositoryTable implements RepositoryTable {

    private static final String PACKS_PREFIX = PACKS + ".";

    private static final String CHUNKS_PREFIX = CHUNKS + ".";

    private final DBCollection collection;

    private final DBCollection metadata;

    /**
     * @param collection
     * @param metadata
     */
    public MongoRepositoryTable(DBCollection collection, DBCollection metadata) {
        this.collection = collection;
        this.metadata = metadata;
    }

    public RepositoryKey nextKey() throws DhtException {
        DBObject value = new BasicDBObject(METADATA, 0);
        DBObject updated = metadata.findAndModify(value, null, null, false, MongoUtils.inc(KEY), true, true);
        return RepositoryKey.fromInt(MongoUtils.getInt(updated, KEY));
    }

    public void put(RepositoryKey repo, ChunkInfo info, WriteBuffer buffer) throws DhtException {
        String key = CHUNKS_PREFIX + info.getChunkKey().asString();
        DBObject object = MongoUtils.set(key, info.getData().toByteArray());
        collection.update(new IdObject(repo.asInt()), object, true, false);
    }

    public void remove(RepositoryKey repo, ChunkKey chunk, WriteBuffer buffer) throws DhtException {
        DBObject object = MongoUtils.unset(CHUNKS_PREFIX + chunk.asString());
        collection.update(new IdObject(repo.asInt()), object, true, false);
    }

    public Collection<CachedPackInfo> getCachedPacks(RepositoryKey repo) throws DhtException, TimeoutException {
        DBObject object = collection.findOne(new IdObject(repo.asInt()));
        if (object == null)
            return Collections.emptyList();
        Object packs = object.get(PACKS);
        if (!(packs instanceof DBObject))
            return Collections.emptyList();
        DBObject dbo = (DBObject) packs;
        List<CachedPackInfo> info = new ArrayList<CachedPackInfo>();
        for (String key : dbo.keySet()) {
            byte[] value = MongoUtils.getBytes(dbo, key);
            try {
                info.add(CachedPackInfo.parseFrom(value));
            } catch (InvalidProtocolBufferException e) {
                throw new DhtException(e);
            }
        }
        return info;
    }

    public void put(RepositoryKey repo, CachedPackInfo info, WriteBuffer buffer) throws DhtException {
        CachedPackKey key = CachedPackKey.fromInfo(info);
        DBObject object = MongoUtils.set(PACKS_PREFIX + key.asString(), info.toByteArray());
        collection.update(new IdObject(repo.asInt()), object, true, false);
    }

    public void remove(RepositoryKey repo, CachedPackKey key, WriteBuffer buffer) throws DhtException {
        DBObject object = MongoUtils.unset(PACKS_PREFIX + key.asString());
        collection.update(new IdObject(repo.asInt()), object, true, false);
    }
}