/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.wink.guice.server.internal.lifecycle;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.List;
import org.apache.wink.common.RuntimeContext;
import org.apache.wink.common.internal.lifecycle.LifecycleManager;
import org.apache.wink.common.internal.lifecycle.ObjectCreationException;
import org.apache.wink.common.internal.lifecycle.ObjectFactory;
import org.apache.wink.common.internal.registry.Injectable;
import org.apache.wink.common.internal.registry.InjectableFactory;
import org.apache.wink.common.internal.registry.metadata.ApplicationMetadataCollector;
import org.apache.wink.common.internal.registry.metadata.ClassMetadata;
import org.apache.wink.common.internal.registry.metadata.ConstructorMetadata;
import org.apache.wink.common.internal.registry.metadata.ProviderMetadataCollector;
import org.apache.wink.common.internal.registry.metadata.ResourceMetadataCollector;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.ProvisionException;
public class GuiceInjectorLifeCycleManager<T> implements LifecycleManager<T> {
private final Injector injector;
public GuiceInjectorLifeCycleManager(Injector injector) {
this.injector = injector;
}
// private Logger logger =
// LoggerFactory.getLogger(GuiceInjectorLifeCycleManager.class);
public ObjectFactory<T> createObjectFactory(final T object) throws ObjectCreationException {
injector.injectMembers(object);
return new ObjectFactory<T>() {
public T getInstance(RuntimeContext context) {
return object;
}
@SuppressWarnings("unchecked")
public Class<T> getInstanceClass() {
return (Class<T>)object.getClass();
}
public void releaseInstance(T instance, RuntimeContext context) {
/* do nothing */
}
public void releaseAll(RuntimeContext context) {
/* do nothing */
}
};
}
public ObjectFactory<T> createObjectFactory(final Class<T> clazz)
throws ObjectCreationException {
if (clazz == null) {
throw new NullPointerException("cls");
}
if (ResourceMetadataCollector.isDynamicResource(clazz)) {
// default factory cannot create instance of DynamicResource
throw new IllegalArgumentException(String
.format("Cannot create default factory for DynamicResource: %s", clazz));
}
if (ApplicationMetadataCollector.isApplication(clazz)) {
// by default application subclasses are singletons
return new GuiceSingletonObjectFactory<T>(clazz, injector);
}
if (ProviderMetadataCollector.isProvider(clazz)) {
// by default providers are singletons
return new GuiceSingletonObjectFactory<T>(clazz, injector);
}
if (ResourceMetadataCollector.isStaticResource(clazz)) {
// by default resources are prototypes (created per request)
return new GuicePrototypeObjectFactory<T>(clazz, injector);
}
// unknown object, should never reach this code
throw new IllegalArgumentException(String
.format("Cannot create default factory for class: %s", clazz));
}
private static class GuiceSingletonObjectFactory<T> implements ObjectFactory<T> {
private final ClassMetadata classMetadata;
private final boolean isConstructorNoArgumentOrInject;
private final Injector injector;
private final Class<T> clazz;
private T instance;
public GuiceSingletonObjectFactory(Class<T> clazz, Injector injector) {
classMetadata = collectClassMetadata(clazz);
ConstructorMetadata constructorMetadata = classMetadata.getConstructor();
Constructor<?> constructor = constructorMetadata.getConstructor();
List<Injectable> formalParameters = constructorMetadata.getFormalParameters();
isConstructorNoArgumentOrInject =
formalParameters.size() == 0 || constructor.getAnnotation(Inject.class) != null;
this.injector = injector;
this.clazz = clazz;
}
@SuppressWarnings("unchecked")
public T getInstance(RuntimeContext context) {
if (instance != null) {
return instance;
}
try {
if (isConstructorNoArgumentOrInject) {
try {
instance = (T)injector.getInstance(clazz);
return instance;
} catch (ProvisionException e) {
if (e.getCause() == null) {
throw e;
}
throw (Exception)e.getCause();
}
}
instance = (T)createObject(classMetadata, context);
injector.injectMembers(instance);
return instance;
} catch (RuntimeException e) {
throw e;
} catch (Exception e) {
throw new ObjectCreationException(e);
}
}
public Class<T> getInstanceClass() {
return clazz;
}
public void releaseInstance(T instance, RuntimeContext context) {
/* do nothing */
}
public void releaseAll(RuntimeContext context) {
/* do nothing */
}
}
private static class GuicePrototypeObjectFactory<T> implements ObjectFactory<T> {
private final ClassMetadata classMetadata;
private final boolean isConstructorNoArgumentOrInject;
private final Injector injector;
private final Class<T> clazz;
public GuicePrototypeObjectFactory(Class<T> clazz, Injector injector) {
classMetadata = collectClassMetadata(clazz);
ConstructorMetadata constructorMetadata = classMetadata.getConstructor();
Constructor<?> constructor = constructorMetadata.getConstructor();
List<Injectable> formalParameters = constructorMetadata.getFormalParameters();
isConstructorNoArgumentOrInject =
formalParameters.size() == 0 || constructor.getAnnotation(Inject.class) != null;
this.injector = injector;
this.clazz = clazz;
}
@SuppressWarnings("unchecked")
public T getInstance(RuntimeContext context) {
try {
if (isConstructorNoArgumentOrInject) {
try {
return (T)injector.getInstance(clazz);
} catch (ProvisionException e) {
if (e.getCause() == null) {
throw e;
}
throw (Exception)e.getCause();
}
}
T instance = (T)createObject(classMetadata, context);
injector.injectMembers(instance);
return instance;
} catch (RuntimeException e) {
throw e;
} catch (Exception e) {
throw new ObjectCreationException(e);
}
}
public Class<T> getInstanceClass() {
return clazz;
}
public void releaseInstance(T instance, RuntimeContext context) {
/* do nothing */
}
public void releaseAll(RuntimeContext context) {
/* do nothing */
}
}
private static <T> ClassMetadata collectClassMetadata(final Class<T> cls) {
ClassMetadata classMetadata = null;
if (ProviderMetadataCollector.isProvider(cls)) {
classMetadata = ProviderMetadataCollector.collectMetadata(cls);
} else if (ResourceMetadataCollector.isResource(cls)) {
classMetadata = ResourceMetadataCollector.collectMetadata(cls);
} else if (ApplicationMetadataCollector.isApplication(cls)) {
classMetadata = ApplicationMetadataCollector.collectMetadata(cls);
}
return classMetadata;
}
/**
* creates object (StaticResource or Provider) based on its ClassMetadata
*
* @param metadata
* @param runtimeContext
* @return created object
*/
static Object createObject(ClassMetadata metadata, RuntimeContext runtimeContext) {
try {
// use constructor to create a prototype
ConstructorMetadata constructorMetadata = metadata.getConstructor();
Constructor<?> constructor = constructorMetadata.getConstructor();
List<Injectable> formalParameters = constructorMetadata.getFormalParameters();
Object[] params =
InjectableFactory.getInstance().instantiate(formalParameters, runtimeContext);
Object object = constructor.newInstance(params);
return object;
} catch (RuntimeException e) {
throw e;
} catch (InvocationTargetException e) {
Throwable targetException = e.getTargetException();
if (targetException instanceof RuntimeException) {
throw (RuntimeException)targetException;
}
throw new ObjectCreationException(targetException);
} catch (Exception e) {
throw new ObjectCreationException(e);
}
}
}