com.linkedin.pinot.server.request.SimpleRequestHandler.java Source code

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Here is the source code for com.linkedin.pinot.server.request.SimpleRequestHandler.java

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/**
 * Copyright (C) 2014-2015 LinkedIn Corp. (pinot-core@linkedin.com)
 *
 * 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.linkedin.pinot.server.request;

import io.netty.buffer.ByteBuf;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

import org.apache.thrift.protocol.TCompactProtocol;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.linkedin.pinot.common.exception.QueryException;
import com.linkedin.pinot.common.metrics.ServerMeter;
import com.linkedin.pinot.common.metrics.ServerMetrics;
import com.linkedin.pinot.common.metrics.ServerQueryPhase;
import com.linkedin.pinot.common.query.QueryExecutor;
import com.linkedin.pinot.common.request.BrokerRequest;
import com.linkedin.pinot.common.request.InstanceRequest;
import com.linkedin.pinot.common.response.ProcessingException;
import com.linkedin.pinot.common.utils.DataTable;
import com.linkedin.pinot.common.utils.DataTableBuilder;
import com.linkedin.pinot.serde.SerDe;
import com.linkedin.pinot.transport.netty.NettyServer.RequestHandler;

/**
 * A simple implementation of RequestHandler.
 *
 *
 */
public class SimpleRequestHandler implements RequestHandler {

    private static final Logger LOGGER = LoggerFactory.getLogger(SimpleRequestHandler.class);

    private ServerMetrics _serverMetrics;
    QueryExecutor _queryExecutor = null;

    public SimpleRequestHandler(QueryExecutor queryExecutor, ServerMetrics serverMetrics) {
        _queryExecutor = queryExecutor;
        _serverMetrics = serverMetrics;
    }

    @Override
    public byte[] processRequest(ByteBuf request) {

        long queryStartTime = System.nanoTime();
        _serverMetrics.addMeteredValue(null, ServerMeter.QUERIES, 1);

        LOGGER.debug("processing request : {}", request);

        DataTable instanceResponse = null;

        byte[] byteArray = new byte[request.readableBytes()];
        request.readBytes(byteArray);
        SerDe serDe = new SerDe(new TCompactProtocol.Factory());
        BrokerRequest brokerRequest = null;
        try {
            final InstanceRequest queryRequest = new InstanceRequest();
            serDe.deserialize(queryRequest, byteArray);
            long deserRequestTime = System.nanoTime();
            _serverMetrics.addPhaseTiming(brokerRequest, ServerQueryPhase.TOTAL_QUERY_TIME,
                    deserRequestTime - queryStartTime);
            LOGGER.info("instance request : {}", queryRequest);
            brokerRequest = queryRequest.getQuery();

            long startTime = System.nanoTime();
            instanceResponse = _queryExecutor.processQuery(queryRequest);
            long totalNanos = System.nanoTime() - startTime;
            _serverMetrics.addPhaseTiming(brokerRequest, ServerQueryPhase.QUERY_PROCESSING, totalNanos);
        } catch (Exception e) {
            LOGGER.error("Got exception while processing request. Returning error response", e);
            _serverMetrics.addMeteredValue(null, ServerMeter.UNCAUGHT_EXCEPTIONS, 1);
            DataTableBuilder dataTableBuilder = new DataTableBuilder(null);
            List<ProcessingException> exceptions = new ArrayList<ProcessingException>();
            ProcessingException exception = QueryException.INTERNAL_ERROR.deepCopy();
            exception.setMessage(e.getMessage());
            exceptions.add(exception);
            instanceResponse = dataTableBuilder.buildExceptions();
        }

        byte[] responseByte;
        long serializationStartTime = System.nanoTime();
        try {
            if (instanceResponse == null) {
                LOGGER.warn("Instance response is null.");
                responseByte = new byte[0];
            } else {
                responseByte = instanceResponse.toBytes();
            }
        } catch (Exception e) {
            _serverMetrics.addMeteredValue(null, ServerMeter.RESPONSE_SERIALIZATION_EXCEPTIONS, 1);
            LOGGER.error("Got exception while serializing response.", e);
            responseByte = null;
        }
        long serializationEndTime = System.nanoTime();
        _serverMetrics.addPhaseTiming(brokerRequest, ServerQueryPhase.RESPONSE_SERIALIZATION,
                serializationEndTime - serializationStartTime);
        _serverMetrics.addPhaseTiming(brokerRequest, ServerQueryPhase.TOTAL_QUERY_TIME,
                serializationEndTime - queryStartTime);
        return responseByte;
    }

}