/*
* Copyright 2017 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;
import java.io.File;
import javax.annotation.PostConstruct;
import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;
import javax.servlet.ServletContext;
import org.jboss.errai.bus.server.annotations.Service;
import org.uberfire.backend.server.plugins.engine.PluginManager;
import org.uberfire.commons.services.cdi.Startup;
import org.uberfire.commons.services.cdi.StartupType;
/**
* Provides an Errai RPC endpoint to serve JavaScript runtime plugins (authored
* in plain JS) and Perspective Layouts (authored in plain JSON via Layout Editor
* to the client where the corresponding scripts get injected into
* the DOM. These plugins contain logic to programmatically register themselves
* with UberFire.
* It also initializes the {@link PluginManager} which
* is responsible for loading plugins authored in GWT/Errai/UberFire.
* These plugin scripts are injected into the host page by Errai once they are
* registered with Errai's script registry or injected in runtime (when they
* use Uberfire JS API).
* Scripts injected via Errai's script registry do not need any programmatic
* registration logic on the client as all contained managed beans (i.e.
* perspectives, editors, screens) are automatically discovered and activated by
* Errai IOC.
*/
@Service
@ApplicationScoped
@Startup(StartupType.BOOTSTRAP)
public class PluginService {
private static PluginService instance;
private PluginManager pluginManager;
public PluginService() {
}
@Inject
public PluginService(PluginManager pluginManager) {
this.pluginManager = pluginManager;
}
public static PluginService getInstance() {
if (instance == null) {
throw new IllegalStateException(PluginService.class.getName() + " was not initialized on startup");
}
return instance;
}
@PostConstruct
private void startUp() {
instance = this;
}
public void init(final ServletContext servletContext) {
final String contextRootDir = getContextRootDir(servletContext);
final String pluginDir = getPlugins(servletContext,
"plugins");
if (contextRootDir != null && pluginDir != null) {
pluginManager.init(contextRootDir,
pluginDir);
}
}
String getPlugins(ServletContext servletContext,
String plugins) {
return PluginUtils.getRealPath(servletContext,
plugins);
}
String getContextRootDir(ServletContext servletContext) {
return getPlugins(servletContext,
File.separator);
}
}