com.google.caliper.worker.WorkerMain.java Source code

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Here is the source code for com.google.caliper.worker.WorkerMain.java

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/*
 * Copyright (C) 2011 Google Inc.
 *
 * 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.google.caliper.worker;

import static com.google.inject.Stage.PRODUCTION;

import com.google.caliper.bridge.BridgeModule;
import com.google.caliper.bridge.CommandLineSerializer;
import com.google.caliper.bridge.OpenedSocket;
import com.google.caliper.bridge.ShouldContinueMessage;
import com.google.caliper.bridge.WorkerSpec;
import com.google.caliper.runner.BenchmarkClassModule;
import com.google.caliper.runner.ExperimentModule;
import com.google.common.net.InetAddresses;
import com.google.inject.Guice;
import com.google.inject.Injector;

import java.net.InetSocketAddress;
import java.nio.channels.SocketChannel;

/**
 * This class is invoked as a subprocess by the Caliper runner parent process; it re-stages
 * the benchmark and hands it off to the instrument's worker.
 */
public final class WorkerMain {
    private WorkerMain() {
    }

    public static void main(String[] args) throws Exception {
        // TODO(lukes): instead of parsing the spec from the command line pass the port number on the
        // command line and then receive the spec from the socket.  This way we can start JVMs prior
        // to starting experiments and thus get better experiment latency.
        WorkerSpec request = CommandLineSerializer.parse(args[0]);
        // nonblocking connect so we can interleave the system call with injector creation.
        SocketChannel channel = SocketChannel.open();
        channel.configureBlocking(false);
        channel.connect(new InetSocketAddress(InetAddresses.forString("127.0.0.1"), request.port));

        Injector workerInjector = Guice.createInjector(PRODUCTION,
                new BenchmarkClassModule(Class.forName(request.benchmarkSpec.className())), new BridgeModule(),
                ExperimentModule.forWorkerSpec(request), new WorkerModule(request));
        Worker worker = workerInjector.getInstance(Worker.class);
        WorkerEventLog log = new WorkerEventLog(OpenedSocket.fromSocket(channel));

        log.notifyWorkerStarted(request.trialId);
        try {
            worker.setUpBenchmark();
            log.notifyBootstrapPhaseStarting();
            worker.bootstrap();
            log.notifyMeasurementPhaseStarting();
            boolean keepMeasuring = true;
            boolean isInWarmup = true;
            while (keepMeasuring) {
                worker.preMeasure(isInWarmup);
                log.notifyMeasurementStarting();
                try {
                    ShouldContinueMessage message = log.notifyMeasurementEnding(worker.measure());
                    keepMeasuring = message.shouldContinue();
                    isInWarmup = !message.isWarmupComplete();
                } finally {
                    worker.postMeasure();
                }
            }
        } catch (Exception e) {
            log.notifyFailure(e);
        } finally {
            System.out.flush(); // ?
            worker.tearDownBenchmark();
            log.close();
        }
    }
}