/*
* Copyright 2011 JBoss, by 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.ioc.support.bus.rebind;
import static org.jboss.errai.codegen.meta.MetaClassFactory.parameterizedAs;
import static org.jboss.errai.codegen.meta.MetaClassFactory.typeParametersOf;
import org.jboss.errai.bus.client.ErraiBus;
import org.jboss.errai.bus.client.api.Local;
import org.jboss.errai.bus.client.api.Subscription;
import org.jboss.errai.bus.server.annotations.Service;
import org.jboss.errai.codegen.Parameter;
import org.jboss.errai.codegen.Statement;
import org.jboss.errai.codegen.builder.AnonymousClassStructureBuilder;
import org.jboss.errai.codegen.builder.BlockBuilder;
import org.jboss.errai.codegen.builder.impl.ObjectBuilder;
import org.jboss.errai.codegen.meta.MetaClass;
import org.jboss.errai.codegen.util.Refs;
import org.jboss.errai.codegen.util.Stmt;
import org.jboss.errai.ioc.client.api.CodeDecorator;
import org.jboss.errai.ioc.client.container.DestructionCallback;
import org.jboss.errai.ioc.rebind.ioc.extension.IOCDecoratorExtension;
import org.jboss.errai.ioc.rebind.ioc.injector.InjectUtil;
import org.jboss.errai.ioc.rebind.ioc.injector.api.InjectableInstance;
import org.jboss.errai.ioc.rebind.ioc.injector.api.InjectionContext;
import java.lang.annotation.Annotation;
import java.util.Arrays;
import java.util.List;
@SuppressWarnings("UnusedDeclaration")
@CodeDecorator
public class ServiceCodeDecorator extends IOCDecoratorExtension<Service> {
public ServiceCodeDecorator(final Class<Service> decoratesWith) {
super(decoratesWith);
}
@Override
public List<? extends Statement> generateDecorator(final InjectableInstance<Service> injectableInstance) {
final InjectionContext ctx = injectableInstance.getInjectionContext();
/**
* Ensure the the container generates a stub to internally expose the field if it's private.
*/
injectableInstance.ensureMemberExposed();
/**
* Figure out the service name;
*/
final String svcName = injectableInstance.getAnnotation().value().equals("")
? injectableInstance.getMemberName() : injectableInstance.getAnnotation().value();
boolean local = false;
for (final Annotation a : injectableInstance.getQualifiers()) {
if (Local.class.equals(a.annotationType())) {
local = true;
}
}
final String varName = InjectUtil.getUniqueVarName();
final Statement subscribeStatement;
if (local) {
subscribeStatement = Stmt.invokeStatic(ErraiBus.class, "get")
.invoke("subscribeLocal", svcName, injectableInstance.getValueStatement());
}
else {
subscribeStatement = Stmt.invokeStatic(ErraiBus.class, "get")
.invoke("subscribe", svcName, injectableInstance.getValueStatement());
}
final Statement declareVar = Stmt.declareFinalVariable(varName, Subscription.class, subscribeStatement);
final MetaClass destructionCallbackType =
parameterizedAs(DestructionCallback.class, typeParametersOf(injectableInstance.getEnclosingType()));
// register a destructor to unregister the service when the bean is destroyed.
final BlockBuilder<AnonymousClassStructureBuilder> destroyMeth
= ObjectBuilder.newInstanceOf(destructionCallbackType).extend()
.publicOverridesMethod("destroy", Parameter.of(injectableInstance.getEnclosingType(), "obj", true))
.append(Stmt.loadVariable(varName).invoke("remove"));
final Statement descrCallback = Stmt.create().loadVariable("context").invoke("addDestructionCallback",
Refs.get(injectableInstance.getInjector().getInstanceVarName()), destroyMeth.finish().finish());
return Arrays.asList(declareVar, descrCallback);
}
}