com.torodb.mongowp.server.wp.RequestMessageObjectHandler.java Source code

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Here is the source code for com.torodb.mongowp.server.wp.RequestMessageObjectHandler.java

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/*
 * Copyright 2014 8Kdata Technology
 *
 * 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.torodb.mongowp.server.wp;

import static com.torodb.mongowp.messages.request.RequestOpCode.OP_DELETE;
import static com.torodb.mongowp.messages.request.RequestOpCode.OP_GET_MORE;
import static com.torodb.mongowp.messages.request.RequestOpCode.OP_INSERT;
import static com.torodb.mongowp.messages.request.RequestOpCode.OP_KILL_CURSORS;
import static com.torodb.mongowp.messages.request.RequestOpCode.OP_QUERY;
import static com.torodb.mongowp.messages.request.RequestOpCode.OP_UPDATE;

import com.torodb.mongowp.messages.request.DeleteMessage;
import com.torodb.mongowp.messages.request.GetMoreMessage;
import com.torodb.mongowp.messages.request.InsertMessage;
import com.torodb.mongowp.messages.request.KillCursorsMessage;
import com.torodb.mongowp.messages.request.QueryMessage;
import com.torodb.mongowp.messages.request.RequestMessage;
import com.torodb.mongowp.messages.request.RequestOpCode;
import com.torodb.mongowp.messages.request.UpdateMessage;
import com.torodb.mongowp.server.callback.MessageReplier;
import com.torodb.mongowp.server.callback.RequestProcessor;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.AttributeKey;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import javax.inject.Inject;

/**
 *
 */
@ChannelHandler.Sharable
public class RequestMessageObjectHandler extends ChannelInboundHandlerAdapter {

    private static final Logger LOGGER = LogManager.getLogger(RequestMessageObjectHandler.class);

    public static final AttributeKey<RequestOpCode> REQUEST_OP_CODE = AttributeKey.valueOf("requestOpCode");

    private final RequestProcessor requestProcessor;

    @Inject
    public RequestMessageObjectHandler(RequestProcessor requestProcessor) {
        this.requestProcessor = requestProcessor;
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        try (RequestMessage requestMessage = (RequestMessage) msg) {
            ctx.attr(NettyMessageReplier.REQUEST_ID).set(requestMessage.getBaseMessage().getRequestId());
            LOGGER.debug("Received message type: {}, data: {}", requestMessage.getOpCode(), requestMessage);

            MessageReplier messageReplier = new NettyMessageReplier(ctx);
            ctx.attr(REQUEST_OP_CODE).set(requestMessage.getOpCode());
            switch (requestMessage.getOpCode()) {
            case OP_QUERY:
                assert requestMessage instanceof QueryMessage;
                requestProcessor.queryMessage((QueryMessage) requestMessage, messageReplier);
                break;
            case OP_GET_MORE:
                assert requestMessage instanceof GetMoreMessage;
                requestProcessor.getMore((GetMoreMessage) requestMessage, messageReplier);
                break;
            case OP_KILL_CURSORS:
                assert requestMessage instanceof KillCursorsMessage;
                requestProcessor.killCursors((KillCursorsMessage) requestMessage, messageReplier);
                break;
            case OP_INSERT:
                assert requestMessage instanceof InsertMessage;
                requestProcessor.insert((InsertMessage) requestMessage, messageReplier);
                break;
            case OP_UPDATE:
                assert requestMessage instanceof UpdateMessage;
                requestProcessor.update((UpdateMessage) requestMessage, messageReplier);
                break;
            case OP_DELETE:
                assert requestMessage instanceof DeleteMessage;
                requestProcessor.delete((DeleteMessage) requestMessage, messageReplier);
                break;
            default:
                throw new UnsupportedOperationException(
                        "Message replier not implemented for " + requestMessage.getOpCode() + " opCode");
            }
        }
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        logCaughtException(cause);

        MessageReplier messageReplier = new NettyMessageReplier(ctx);
        requestProcessor.handleError(ctx.attr(REQUEST_OP_CODE).get(), messageReplier, cause);
    }

    private void logCaughtException(Throwable cause) {
        String message = "Error while processing request";
        if (cause.getMessage() != null) {
            message += " (" + cause.getMessage() + ")";
        }

        LOGGER.error(message, cause);
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        try {
            LOGGER.info("Connection established from " + ctx.channel().remoteAddress());
        } catch (Exception e) {
            LOGGER.debug("Exception raised while logging connection", e);
        }

        requestProcessor.onChannelActive(ctx);

        super.channelActive(ctx);
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        try {
            LOGGER.info("Connection finished from " + ctx.channel().remoteAddress());
        } catch (Exception e) {
            LOGGER.debug("Exception raised while logging disconnection", e);
        }

        super.channelInactive(ctx);

        requestProcessor.onChannelInactive(ctx);
    }
}