org.gitective.mongo.MongoObjectIndexTable.java Source code

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Here is the source code for org.gitective.mongo.MongoObjectIndexTable.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.VALUES;

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

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import org.eclipse.jgit.generated.storage.dht.proto.GitStore;
import org.eclipse.jgit.storage.dht.AsyncCallback;
import org.eclipse.jgit.storage.dht.ChunkKey;
import org.eclipse.jgit.storage.dht.DhtException;
import org.eclipse.jgit.storage.dht.ObjectIndexKey;
import org.eclipse.jgit.storage.dht.ObjectInfo;
import org.eclipse.jgit.storage.dht.spi.Context;
import org.eclipse.jgit.storage.dht.spi.ObjectIndexTable;
import org.eclipse.jgit.storage.dht.spi.WriteBuffer;

/**
 * MongoDB-backed object index table
 */
public class MongoObjectIndexTable implements ObjectIndexTable {

    private static final String VALUES_PREFIX = VALUES + ".";

    private final DBCollection collection;

    /**
     * 
     * @param collection
     */
    public MongoObjectIndexTable(DBCollection collection) {
        this.collection = collection;
    }

    public void get(Context options, Set<ObjectIndexKey> objects,
            AsyncCallback<Map<ObjectIndexKey, Collection<ObjectInfo>>> callback) {
        Map<ObjectIndexKey, Collection<ObjectInfo>> out = new HashMap<ObjectIndexKey, Collection<ObjectInfo>>();
        for (ObjectIndexKey objId : objects) {
            DBObject fetch = collection.findOne(new IdObject(objId.asString()));
            if (fetch == null)
                continue;
            Object values = fetch.get(VALUES);
            if (values instanceof DBObject) {
                DBObject dbo = (DBObject) values;
                Collection<ObjectInfo> chunks = out.get(objId);
                if (chunks == null) {
                    chunks = new ArrayList<ObjectInfo>(4);
                    out.put(objId, chunks);
                }
                for (String key : dbo.keySet()) {
                    byte[] value = MongoUtils.getBytes(dbo, key);
                    key = unescapeKey(key);
                    try {
                        chunks.add(
                                new ObjectInfo(ChunkKey.fromString(key), 0, GitStore.ObjectInfo.parseFrom(value)));
                    } catch (InvalidProtocolBufferException e) {
                        callback.onFailure(new DhtException(e));
                        return;
                    }
                }
            }
        }
        callback.onSuccess(out);
    }

    private String escapeKey(String key) {
        return key.replace('.', ':');
    }

    private String unescapeKey(String key) {
        return key.replace(':', '.');
    }

    public void add(ObjectIndexKey objId, ObjectInfo info, WriteBuffer buffer) throws DhtException {
        IdObject id = new IdObject(objId.asString());
        String key = escapeKey(info.getChunkKey().asString());
        DBObject object = MongoUtils.set(VALUES_PREFIX + key, info.getData().toByteArray());
        collection.update(id, object, true, false);
    }

    public void remove(ObjectIndexKey objId, ChunkKey chunk, WriteBuffer buffer) throws DhtException {
        IdObject id = new IdObject(objId.asString());
        String key = escapeKey(chunk.asString());
        collection.update(id, MongoUtils.unset(VALUES_PREFIX + key), true, false);
    }
}