/*
* Copyright 2009 JBoss, a divison Red Hat, 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 org.jboss.errai.bus.server.service.bootstrap;
import com.google.inject.AbstractModule;
import com.google.inject.CreationException;
import com.google.inject.Guice;
import org.jboss.errai.bus.client.api.ResourceProvider;
import org.jboss.errai.bus.client.framework.MessageBus;
import org.jboss.errai.bus.server.ErraiBootstrapFailure;
import org.jboss.errai.bus.server.annotations.ExtensionComponent;
import org.jboss.errai.bus.server.api.ErraiConfig;
import org.jboss.errai.bus.server.api.ErraiConfigExtension;
import org.jboss.errai.bus.server.service.ErraiServiceConfigurator;
import org.jboss.errai.bus.server.service.ErraiServiceConfiguratorImpl;
import org.jboss.errai.bus.server.util.ConfigVisitor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.File;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import static org.jboss.errai.bus.server.util.ConfigUtil.visitAllTargets;
/**
* @author: Heiko Braun <hbraun@redhat.com>
* @date: May 7, 2010
*/
public class LoadExtensions implements BootstrapExecution
{
private Logger log = LoggerFactory.getLogger(LoadExtensions.class);
public void execute(final BootstrapContext context)
{
final ErraiServiceConfiguratorImpl config = (ErraiServiceConfiguratorImpl)context.getConfig();
boolean autoScanModules = true;
final Set<String> loadedComponents = new HashSet<String>();
/*** Extensions ***/
if (config.hasProperty("errai.auto_load_extensions")) {
autoScanModules = Boolean.parseBoolean(config.getProperty("errai.auto_load_extensions"));
}
if (autoScanModules) {
log.info("beging searching for Errai extensions ...");
final ErraiConfig erraiConfig = new ErraiConfig() {
public void addBinding(Class<?> type, ResourceProvider provider) {
config.getExtensionBindings().put(type, provider);
}
public void addResourceProvider(String name, ResourceProvider provider) {
config.getResourceProviders().put(name, provider);
}
public void addSerializableType(Class<?> type) {
log.info("Marked " + type + " as serializable.");
loadedComponents.add(type.getName());
config.getSerializableTypes().add(type);
}
};
// Search for Errai extensions.
List<File> configRootTargets = context.getConfigTargets();
visitAllTargets(configRootTargets, new ConfigVisitor() {
public void visit(Class<?> loadClass) {
if (ErraiConfigExtension.class.isAssignableFrom(loadClass)
&& loadClass.isAnnotationPresent(ExtensionComponent.class) && !loadedComponents.contains(loadClass.getName())) {
loadedComponents.add(loadClass.getName());
// We have an annotated ErraiConfigExtension. So let's configure it.
final Class<? extends ErraiConfigExtension> clazz =
loadClass.asSubclass(ErraiConfigExtension.class);
log.info("found extension " + clazz.getName());
try {
final Runnable create = new Runnable() {
public void run() {
AbstractModule module = new AbstractModule() {
@Override
protected void configure() {
bind(ErraiConfigExtension.class).to(clazz);
bind(ErraiServiceConfigurator.class).toInstance(config);
bind(MessageBus.class).toInstance(context.getBus());
// Add any extension bindings.
for (Map.Entry<Class<?>, ResourceProvider> entry : config.getExtensionBindings().entrySet()) {
bind(entry.getKey()).toProvider(new GuiceProviderProxy(entry.getValue()));
}
}
};
Guice.createInjector(module)
.getInstance(ErraiConfigExtension.class)
.configure(erraiConfig);
}
};
try {
create.run();
}
catch (CreationException e) {
log.info("extension " + clazz.getName() + " cannot be bound yet, deferring ...");
context.defer(create);
}
}
catch (Throwable e) {
throw new ErraiBootstrapFailure("could not initialize extension: " + loadClass.getName(), e);
}
}
}
});
for (Class bindingType : config.getExtensionBindings().keySet()) {
log.info("added extension binding: " + bindingType.getName());
}
log.info("total extension binding: " + config.getExtensionBindings().keySet().size());
} else {
log.info("auto-loading of extensions disabled.");
}
}
}