com.cloudera.cdk.maven.plugins.DeployAppMojo.java Source code

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Here is the source code for com.cloudera.cdk.maven.plugins.DeployAppMojo.java

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/**
 * Copyright 2013 Cloudera 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.cloudera.cdk.maven.plugins;

import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.fs.Path;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;

/**
 * Deploy a packaged application to a Hadoop filesystem, such as HDFS.
 */
@Mojo(name = "deploy-app")
public class DeployAppMojo extends AbstractAppMojo {

    /**
     * The local directory of the application to deploy.
     */
    @Parameter(property = "cdk.localApplicationFile", defaultValue = "${project.build.directory}/${project.build.finalName}-app")
    private File localApplicationFile;

    /**
     * The Hadoop fileystem used to deploy the application. The filesystem must be
     * accessible by the client deploying the application.
     */
    @Parameter(property = "cdk.deployFileSystem", required = true)
    private String deployFileSystem;

    /**
     * Whether to automatically undeploy applications that already exist when deploying.
     * If <code>false</code>, and this application has already been deployed,
     * then an error will be reported.
     */
    @Parameter(property = "cdk.updateApplication", defaultValue = "false")
    private boolean updateApplication;

    public void execute() throws MojoExecutionException, MojoFailureException {
        try {
            Configuration conf = new Configuration();
            Path appPath = getAppPath();
            getLog().info("Deploying " + localApplicationFile + " to " + appPath);

            FileSystem destFileSystem = FileSystem.get(new URI(deployFileSystem), conf);
            if (destFileSystem.exists(appPath)) {
                if (!updateApplication) {
                    throw new MojoExecutionException("Application already exists at " + appPath
                            + ". Use 'updateApplication' option to force deployment.");
                }
                boolean success = destFileSystem.delete(appPath, true);
                if (!success) {
                    throw new MojoExecutionException("Error deleting existing application at " + appPath);
                }
            }
            boolean success = FileUtil.copy(localApplicationFile, destFileSystem, appPath, false, conf);
            if (!success) {
                throw new MojoExecutionException(
                        "Error creating parent directories " + "for deploying Oozie application");
            }
        } catch (URISyntaxException e) {
            throw new MojoExecutionException("Syntax error in 'deployFileSystem': " + deployFileSystem, e);
        } catch (IOException e) {
            throw new MojoExecutionException("Error deploying application", e);
        }
    }
}