org.glowroot.container.impl.SocketCommandProcessor Maven / Gradle / Ivy

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/*
 * Copyright 2011-2015 the original author or authors.
 *
 * 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 org.glowroot.container.impl;

import java.io.EOFException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.List;
import java.util.Set;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import javax.annotation.Nullable;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.glowroot.GlowrootModule;
import org.glowroot.MainEntryPoint;
import org.glowroot.common.SpyingLogbackFilter;
import org.glowroot.container.AppUnderTest;
import org.glowroot.container.Threads;
import org.glowroot.container.impl.SocketCommander.CommandWrapper;
import org.glowroot.container.impl.SocketCommander.ResponseWrapper;

class SocketCommandProcessor implements Runnable {

    public static final String EXECUTE_APP = "EXECUTE_APP";
    public static final String GET_PORT = "GET_PORT";
    public static final String ADD_EXPECTED_LOG_MESSAGE = "ADD_EXPECTED_LOG_MESSAGE";
    public static final String CLEAR_LOG_MESSAGES = "CLEAR_LOG_MESSAGES";
    public static final String EXCEPTION_RESPONSE = "EXCEPTION";
    public static final String SHUTDOWN = "SHUTDOWN";
    public static final String KILL = "KILL";
    public static final String INTERRUPT = "INTERRUPT";
    public static final String STARTUP_FAILED = "STARTUP_FAILED";

    private static final Logger logger = LoggerFactory.getLogger(SocketCommandProcessor.class);

    private final ObjectInputStream objectIn;
    private final ObjectOutputStream objectOut;
    private final ExecutorService executorService;
    private final List executingAppThreads = Lists.newCopyOnWriteArrayList();

    private final Set preExistingThreads;

    SocketCommandProcessor(ObjectInputStream objectIn, ObjectOutputStream objectOut) {
        this.objectIn = objectIn;
        this.objectOut = objectOut;
        executorService = Executors.newCachedThreadPool();
        preExistingThreads = Sets.newHashSet(Threads.currentThreads());
    }

    @Override
    public void run() {
        preExistingThreads.add(Thread.currentThread());
        try {
            while (true) {
                readCommandAndSpawnHandlerThread();
            }
        } catch (EOFException e) {
            // socket was closed, terminate gracefully
            terminateJvm(0);
        } catch (Throwable e) {
            // this may not get logged if test jvm has been terminated already
            logger.error(e.getMessage(), e);
            terminateJvm(1);
        }
    }

    private void readCommandAndSpawnHandlerThread() throws Exception {
        final CommandWrapper commandWrapper = (CommandWrapper) objectIn.readObject();
        logger.debug("command received by external jvm: {}", commandWrapper);
        executorService.submit(new Runnable() {
            @Override
            public void run() {
                preExistingThreads.add(Thread.currentThread());
                try {
                    runCommandAndRespond(commandWrapper);
                } catch (EOFException e) {
                    // socket was closed, terminate gracefully
                    terminateJvm(0);
                } catch (Throwable e) {
                    // this may not get logged if test jvm has been terminated already
                    logger.error(e.getMessage(), e);
                    terminateJvm(1);
                }
            }
        });
    }

    private void runCommandAndRespond(CommandWrapper commandWrapper) throws Exception {
        try {
            runCommandAndRespondInternal(commandWrapper);
        } catch (Throwable t) {
            // catch Throwable so response can (hopefully) be sent even under extreme
            // circumstances like OutOfMemoryError
            logger.error(t.getMessage(), t);
            respond(EXCEPTION_RESPONSE, commandWrapper.getCommandNum());
        }
    }

    private void runCommandAndRespondInternal(CommandWrapper commandWrapper) throws Exception {
        String commandName = commandWrapper.getCommandName();
        ImmutableList