com.eightkdata.mongowp.server.decoder.GetMoreMessageDecoder.java Source code

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Here is the source code for com.eightkdata.mongowp.server.decoder.GetMoreMessageDecoder.java

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/*
 * MongoWP
 * Copyright  2014 8Kdata Technology (www.8kdata.com)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package com.eightkdata.mongowp.server.decoder;

import com.eightkdata.mongowp.bson.netty.NettyBsonReaderException;
import com.eightkdata.mongowp.bson.netty.NettyStringReader;
import com.eightkdata.mongowp.exceptions.InvalidBsonException;
import com.eightkdata.mongowp.exceptions.InvalidNamespaceException;
import com.eightkdata.mongowp.messages.request.GetMoreMessage;
import com.eightkdata.mongowp.messages.request.RequestBaseMessage;
import io.netty.buffer.ByteBuf;

import javax.inject.Inject;
import javax.inject.Singleton;

/**
 *
 */
@Singleton
public class GetMoreMessageDecoder extends AbstractMessageDecoder<GetMoreMessage> {

    private final NettyStringReader stringReader;

    @Inject
    public GetMoreMessageDecoder(NettyStringReader stringReader) {
        this.stringReader = stringReader;
    }

    @Override
    public GetMoreMessage decode(ByteBuf buffer, RequestBaseMessage requestBaseMessage)
            throws InvalidNamespaceException, InvalidBsonException {
        try {
            buffer.skipBytes(4);
            String fullCollectionName = stringReader.readCString(buffer, true);
            int numberToReturn = buffer.readInt();
            long cursorId = buffer.readLong();

            //TODO: improve the way database and cache are pooled
            return new GetMoreMessage(requestBaseMessage, getDatabase(fullCollectionName).intern(),
                    getCollection(fullCollectionName).intern(), numberToReturn, cursorId);
        } catch (NettyBsonReaderException ex) {
            throw new InvalidBsonException(ex);
        }
    }
}