io.gatling.mojo.Fork.java Source code

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Here is the source code for io.gatling.mojo.Fork.java

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/**
 * Copyright 2011-2015 GatlingCorp (http://gatling.io)
 *
 * 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 io.gatling.mojo;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.Map.Entry;

import org.apache.commons.exec.CommandLine;
import org.apache.commons.exec.DefaultExecutor;
import org.apache.commons.exec.Executor;
import org.apache.commons.exec.PumpStreamHandler;
import org.apache.commons.exec.ShutdownHookProcessDestroyer;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.toolchain.Toolchain;
import org.codehaus.plexus.util.StringUtils;

public class Fork {

    private static final String ARG_FILE_PREFIX = "gatling-maven-plugin-";
    private static final String ARG_FILE_SUFFIX = ".args";

    private final String javaExecutable;
    private final String mainClassName;
    private final List<String> classpath;
    private final boolean propagateSystemProperties;

    private final List<String> jvmArgs = new ArrayList<>();
    private final List<String> args = new ArrayList<>();

    public Fork(String mainClassName, List<String> classpath, List<String> jvmArgs, List<String> args,
            Toolchain toolchain, boolean propagateSystemProperties) throws Exception {

        this.mainClassName = mainClassName;
        this.classpath = classpath;
        this.jvmArgs.addAll(jvmArgs);
        this.args.addAll(args);
        this.javaExecutable = findJavaExecutable(toolchain);
        this.propagateSystemProperties = propagateSystemProperties;
    }

    public void run() throws Exception {

        if (propagateSystemProperties) {
            for (Entry<Object, Object> systemProp : System.getProperties().entrySet()) {
                String name = systemProp.getKey().toString();
                String value = systemProp.getValue().toString();
                if (isPropagatableProperty(name)) {
                    String escapedValue = StringUtils.escape(value);
                    String safeValue = escapedValue.contains(" ") ? '"' + escapedValue + '"' : escapedValue;
                    this.jvmArgs.add("-D" + name + "=" + safeValue);
                }
            }
        }

        this.jvmArgs.add("-jar");
        this.jvmArgs
                .add(MojoUtils.createBooterJar(classpath, MainWithArgsInFile.class.getName()).getCanonicalPath());

        List<String> command = buildCommand();

        Executor exec = new DefaultExecutor();
        exec.setStreamHandler(new PumpStreamHandler(System.out, System.err, System.in));
        exec.setProcessDestroyer(new ShutdownHookProcessDestroyer());

        CommandLine cl = new CommandLine(javaExecutable);
        for (String arg : command) {
            cl.addArgument(arg, false);
        }

        int exitValue = exec.execute(cl);
        if (exitValue != 0) {
            throw new MojoFailureException("command line returned non-zero value:" + exitValue);
        }
    }

    private List<String> buildCommand() throws IOException {
        ArrayList<String> command = new ArrayList<String>(jvmArgs.size() + 2);
        command.addAll(jvmArgs);
        command.add(mainClassName);
        command.add(createArgFile(args).getCanonicalPath());
        return command;
    }

    private boolean isPropagatableProperty(String name) {
        return !name.startsWith("java.") //
                && !name.startsWith("sun.") //
                && !name.startsWith("maven.") //
                && !name.startsWith("file.") //
                && !name.startsWith("awt.") //
                && !name.startsWith("os.") //
                && !name.startsWith("user.") //
                && !name.equals("line.separator") //
                && !name.equals("path.separator");
    }

    private String findJavaExecutable(Toolchain toolchain) {
        String fromToolchain = toolchain != null ? toolchain.findTool("java") : null;
        if (fromToolchain != null) {
            return fromToolchain;
        } else {
            String javaHome;
            javaHome = System.getProperty("java.home");
            if (javaHome == null) {
                javaHome = System.getenv("JAVA_HOME");
                if (javaHome == null) {
                    throw new IllegalStateException(
                            "Couldn't locate java, try setting JAVA_HOME environment variable.");
                }
            }
            return javaHome + File.separator + "bin" + File.separator + "java";
        }
    }

    private File createArgFile(List<String> args) throws IOException {
        final File argFile = File.createTempFile(ARG_FILE_PREFIX, ARG_FILE_SUFFIX);
        argFile.deleteOnExit();
        try (PrintWriter out = new PrintWriter(argFile)) {
            for (String arg : args) {
                out.println(arg);
            }
            return argFile;
        }
    }
}