org.springframework.cloud.dataflow.app.launcher.MultiArchiveLauncher.java Source code

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Here is the source code for org.springframework.cloud.dataflow.app.launcher.MultiArchiveLauncher.java

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/*
 * Copyright 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.springframework.cloud.dataflow.app.launcher;

import java.lang.reflect.Method;
import java.net.URL;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.boot.loader.Launcher;
import org.springframework.boot.loader.archive.Archive;
import org.springframework.cloud.dataflow.app.utils.ClassloaderUtils;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import org.springframework.util.ReflectionUtils;

/**
 * A {@link Launcher} for multiple independent JAR archives (which aren't nested in an uber jar). This class
 * supports adding includes and excludes to a module's classpath.
 *
 * @author Marius Bogoevici
 * @author Eric Bottard
 */
public class MultiArchiveLauncher extends Launcher {

    private static Log log = LogFactory.getLog(MultiArchiveLauncher.class);

    private final List<Archive> archives;

    /**
     * A list of archives, the first of which is expected to be a Spring boot uberJar
     * 
     * @param archives
     */
    public MultiArchiveLauncher(List<Archive> archives) {
        Assert.notEmpty(archives, "A list of archives must be provided");
        this.archives = archives;
    }

    @Override
    protected String getMainClass() throws Exception {
        return archives.get(0).getManifest().getMainAttributes().getValue("Start-Class");
    }

    @Override
    protected List<Archive> getClassPathArchives() throws Exception {
        return archives;
    }

    @Override
    public void launch(String[] args) {
        super.launch(args);
    }

    @Override
    protected void launch(String[] args, String mainClass, ClassLoader classLoader) throws Exception {
        if (log.isDebugEnabled()) {
            for (Archive archive : archives) {
                log.debug("Launching with: " + archive.getUrl().toString());
            }
        }
        if (ClassUtils.isPresent("org.apache.catalina.webresources.TomcatURLStreamHandlerFactory", classLoader)) {
            // Ensure the method is invoked on a class that is loaded by the provided
            // class loader (not the current context class loader):
            Method method = ReflectionUtils.findMethod(
                    classLoader.loadClass("org.apache.catalina.webresources.TomcatURLStreamHandlerFactory"),
                    "disable");
            ReflectionUtils.invokeMethod(method, null);
        }
        super.launch(args, mainClass, classLoader);
    }

    @Override
    protected ClassLoader createClassLoader(URL[] urls) throws Exception {
        return ClassloaderUtils.createModuleClassloader(urls);
    }

}