/*
* Copyright 2016 Red Hat, Inc. and/or its affiliates.
*
* 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.uberfire.backend.server.plugins.engine;
import java.io.File;
import java.io.IOException;
import java.util.Collection;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import javax.annotation.PreDestroy;
import javax.enterprise.context.Dependent;
import javax.inject.Inject;
import org.apache.commons.io.FileUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Manages Uberfire Plugins which involves monitoring the plugins directory
* (see {@link PluginWatcher}), and loading the deployed plugins (see
* {@link PluginJarProcessor}).
*/
@Dependent
public class PluginManager {
private static final Logger LOG = LoggerFactory.getLogger(PluginManager.class);
private PluginWatcher pluginWatcher;
private PluginJarProcessor pluginJarProcessor;
private ExecutorService executor;
@Inject
public PluginManager(final PluginWatcher pluginWatcher,
final PluginJarProcessor pluginJarProcessor) {
this.pluginWatcher = pluginWatcher;
this.pluginJarProcessor = pluginJarProcessor;
this.executor = Executors.newSingleThreadExecutor();
}
@PreDestroy
void shutDown() {
pluginWatcher.stop();
}
/**
* Initializes the {@link PluginJarProcessor} and
* {@link PluginWatcher} based on the provided parameters.
* @param contextRootDir the web application's context root directory, must not be
* null.
* @param pluginDir the plugin directory, must not be null.
*/
public void init(final String contextRootDir,
final String pluginDir) {
try {
pluginJarProcessor.init(pluginDir,
findPluginDeploymentDir(contextRootDir));
pluginWatcher.start(pluginDir,
executor,
pluginJarProcessor);
} catch (Exception e) {
LOG.error("Failed to initialize " + PluginManager.class.getName(),
e);
throw new RuntimeException(e);
}
}
/**
* Finds the directory to deploy plugin contents to.
* @param contextRootDir the web application's context root directory, must not be
* null.
* @return the directory hosting the plugin's JS files or the provided
* context root directory if not found.
*/
String findPluginDeploymentDir(String contextRootDir) throws IOException {
final Collection<File> gwtFiles = FileUtils.listFiles(new File(contextRootDir),
new String[]{"nocache.js"},
true);
if (!gwtFiles.isEmpty()) {
final File gwtFile = gwtFiles.iterator().next();
return gwtFile.getParentFile().getCanonicalPath();
}
return new File(contextRootDir).getCanonicalPath();
}
}