co.cask.cdap.internal.test.AppJarHelper.java Source code

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Here is the source code for co.cask.cdap.internal.test.AppJarHelper.java

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/*
 * Copyright  2015 Cask Data, 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 co.cask.cdap.internal.test;

import co.cask.cdap.common.lang.ClassLoaders;
import com.google.common.collect.ImmutableList;
import com.google.common.io.ByteStreams;
import com.google.common.io.Files;
import org.apache.twill.filesystem.Location;
import org.apache.twill.filesystem.LocationFactory;
import org.apache.twill.internal.ApplicationBundler;

import java.io.File;
import java.io.IOException;
import java.util.HashSet;
import java.util.Set;
import java.util.jar.Attributes;
import java.util.jar.JarEntry;
import java.util.jar.JarInputStream;
import java.util.jar.JarOutputStream;
import java.util.jar.Manifest;

/**
 * Helper class for building application jar.
 */
public final class AppJarHelper {

    private AppJarHelper() {
        // No-op
    }

    public static Location createDeploymentJar(LocationFactory locationFactory, Class<?> clz, Manifest manifest,
            File... bundleEmbeddedJars) throws IOException {

        ApplicationBundler bundler = new ApplicationBundler(
                ImmutableList.of("co.cask.cdap.api", "org.apache.hadoop", "org.apache.hive", "org.apache.spark"),
                ImmutableList.of("org.apache.hadoop.hbase"));
        Location jarLocation = locationFactory.create(clz.getName()).getTempFile(".jar");
        ClassLoader oldClassLoader = ClassLoaders.setContextClassLoader(clz.getClassLoader());
        try {
            bundler.createBundle(jarLocation, clz);
        } finally {
            ClassLoaders.setContextClassLoader(oldClassLoader);
        }

        Location deployJar = locationFactory.create(clz.getName()).getTempFile(".jar");
        Manifest jarManifest = new Manifest(manifest);
        jarManifest.getMainAttributes().put(Attributes.Name.MANIFEST_VERSION, "1.0");
        jarManifest.getMainAttributes().put(Attributes.Name.MAIN_CLASS, clz.getName());

        // Create the program jar for deployment. It removes the "classes/" prefix as that's the convention taken
        // by the ApplicationBundler inside Twill.
        Set<String> seenEntries = new HashSet<>();
        try (JarOutputStream jarOutput = new JarOutputStream(deployJar.getOutputStream(), jarManifest);
                JarInputStream jarInput = new JarInputStream(jarLocation.getInputStream())) {
            JarEntry jarEntry = jarInput.getNextJarEntry();
            while (jarEntry != null) {
                boolean isDir = jarEntry.isDirectory();
                String entryName = jarEntry.getName();
                if (!entryName.equals("classes/")) {
                    if (entryName.startsWith("classes/")) {
                        jarEntry = new JarEntry(entryName.substring("classes/".length()));
                    } else {
                        jarEntry = new JarEntry(entryName);
                    }

                    // TODO: this is due to manifest possibly already existing in the jar, but we also
                    // create a manifest programatically so it's possible to have a duplicate entry here
                    if ("META-INF/MANIFEST.MF".equalsIgnoreCase(jarEntry.getName())) {
                        jarEntry = jarInput.getNextJarEntry();
                        continue;
                    }

                    if (seenEntries.add(jarEntry.getName())) {
                        jarOutput.putNextEntry(jarEntry);
                        if (!isDir) {
                            ByteStreams.copy(jarInput, jarOutput);
                        }
                    }
                }

                jarEntry = jarInput.getNextJarEntry();
            }

            for (File embeddedJar : bundleEmbeddedJars) {
                jarEntry = new JarEntry("lib/" + embeddedJar.getName());
                if (seenEntries.add(jarEntry.getName())) {
                    jarOutput.putNextEntry(jarEntry);
                    Files.copy(embeddedJar, jarOutput);
                }
            }
        }

        return deployJar;
    }

    public static Location createDeploymentJar(LocationFactory locationFactory, Class<?> clz,
            File... bundleEmbeddedJars) throws IOException {
        // Creates Manifest
        Manifest manifest = new Manifest();
        return createDeploymentJar(locationFactory, clz, manifest, bundleEmbeddedJars);
    }
}