com.linkedin.proxy.netty.RocksdbQueryHandler.java Source code

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Here is the source code for com.linkedin.proxy.netty.RocksdbQueryHandler.java

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/**
 * Copyright 2014 LinkedIn Corp. 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.
 */
package com.linkedin.proxy.netty;

import org.apache.log4j.Logger;
import org.rocksdb.RocksDB;

import com.linkedin.proxy.conn.MyConnection;
import com.linkedin.proxy.pool.ConnectionPool;
import com.linkedin.proxy.query.Query;
import com.linkedin.proxy.query.Query.QueryResult;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;

public class RocksdbQueryHandler extends SimpleChannelInboundHandler<Query> {
    private static final Logger _log = Logger.getLogger(RocksdbQueryHandler.class);
    private ConnectionPool _connPool;

    public RocksdbQueryHandler(ConnectionPool connPool) {
        _connPool = connPool;
    }

    @Override
    protected void messageReceived(ChannelHandlerContext ctx, Query msg) throws Exception {
        switch (msg.getType()) {
        case WRITE:
            executeWrite(msg);
            break;
        case READ:
            executeRead(msg);
            break;
        case DELETE:
            executeDelete(msg);
            break;
        case INVALID:
            msg.setResult(QueryResult.FAIL);
            break;

        default:
            break;
        }

        ctx.writeAndFlush(msg);
    }

    private void executeWrite(Query q) {
        MyConnection conn = null;
        try {
            byte[] key = q.getKey().getBytes();
            conn = _connPool.getConnection(q.getDbName());
            _log.debug(Thread.currentThread().getName() + ": Got conn");
            ((RocksDB) conn.getConn()).put(key, q.getValue());
            _log.debug(Thread.currentThread().getName() + ": Performed put");

            q.setResult(QueryResult.OK);
        } catch (Exception e) {
            _log.error(Thread.currentThread().getName() + ": Write query failed", e);
            q.setResult(QueryResult.FAIL);
        } finally {
            if (conn != null)
                tryRelease(conn);
            _log.debug(Thread.currentThread().getName() + ": Released conn");
        }
    }

    private void executeRead(Query q) {
        MyConnection conn = null;
        try {
            byte[] key = q.getKey().getBytes();
            conn = _connPool.getConnection(q.getDbName());
            _log.debug(Thread.currentThread().getName() + ": Got conn");
            byte[] val = ((RocksDB) conn.getConn()).get(key);
            _log.debug(Thread.currentThread().getName() + ": Performed get");

            if (val == null) {
                q.setValue("no-result".getBytes());
                q.setResult(QueryResult.FAIL);
                _log.debug(Thread.currentThread().getName() + ": No result for get");
            } else {
                q.setValue(val);
                q.setResult(QueryResult.OK);
                _log.debug(Thread.currentThread().getName() + ": There is result for get");
            }
        } catch (Exception e) {
            _log.error(Thread.currentThread().getName() + ": Read query failed", e);
            q.setResult(QueryResult.FAIL);
        } finally {
            if (conn != null)
                tryRelease(conn);
            _log.debug(Thread.currentThread().getName() + ": Released conn");
        }
    }

    private void executeDelete(Query q) {
        MyConnection conn = null;
        try {
            byte[] key = q.getKey().getBytes();
            conn = _connPool.getConnection(q.getDbName());
            _log.debug(Thread.currentThread().getName() + ": Got conn");
            ((RocksDB) conn.getConn()).remove(key);
            _log.debug(Thread.currentThread().getName() + ": Performed remove");

            q.setResult(QueryResult.OK);
        } catch (Exception e) {
            _log.error(Thread.currentThread().getName() + ": Delete query failed", e);
            q.setResult(QueryResult.FAIL);
        } finally {
            if (conn != null)
                tryRelease(conn);
            _log.debug(Thread.currentThread().getName() + ": Released conn");
        }
    }

    private void tryRelease(MyConnection conn) {
        try {
            _connPool.releaseConnection(conn);
        } catch (Exception e) {
            _log.error(Thread.currentThread().getName() + ": Failed to releaseConnection", e);
        }
    }
}