org.apache.cxf.jaxrs.lifecycle.PerRequestResourceProvider Maven / Gradle / Ivy
/**
* 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.cxf.jaxrs.lifecycle;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Response;
import org.apache.cxf.jaxrs.utils.InjectionUtils;
import org.apache.cxf.jaxrs.utils.ResourceUtils;
import org.apache.cxf.message.Message;
/**
* The default per-request resource provider which creates
* a new resource instance per every request
*/
public class PerRequestResourceProvider implements ResourceProvider {
private Constructor c;
private Method postConstructMethod;
private Method preDestroyMethod;
public PerRequestResourceProvider(Class clazz) {
c = ResourceUtils.findResourceConstructor(clazz, true);
if (c == null) {
throw new RuntimeException("Resource class " + clazz
+ " has no valid constructor");
}
postConstructMethod = ResourceUtils.findPostConstructMethod(clazz);
preDestroyMethod = ResourceUtils.findPreDestroyMethod(clazz);
}
/**
* {@inheritDoc}
*/
public boolean isSingleton() {
return false;
}
/**
* {@inheritDoc}
*/
public Object getInstance(Message m) {
return createInstance(m);
}
protected Object createInstance(Message m) {
Object[] values = ResourceUtils.createConstructorArguments(c, m);
try {
Object instance = values.length > 0 ? c.newInstance(values) : c.newInstance(new Object[]{});
InjectionUtils.invokeLifeCycleMethod(instance, postConstructMethod);
return instance;
} catch (InstantiationException ex) {
String msg = "Resource class " + c.getDeclaringClass().getName() + " can not be instantiated";
throw new WebApplicationException(Response.serverError().entity(msg).build());
} catch (IllegalAccessException ex) {
String msg = "Resource class " + c.getDeclaringClass().getName() + " can not be instantiated"
+ " due to IllegalAccessException";
throw new WebApplicationException(Response.serverError().entity(msg).build());
} catch (InvocationTargetException ex) {
String msg = "Resource class "
+ c.getDeclaringClass().getName() + " can not be instantiated"
+ " due to InvocationTargetException";
throw new WebApplicationException(Response.serverError().entity(msg).build());
}
}
/**
* {@inheritDoc}
*/
public void releaseInstance(Message m, Object o) {
InjectionUtils.invokeLifeCycleMethod(o, preDestroyMethod);
}
/**
* {@inheritDoc}
*/
public Class getResourceClass() {
return c.getDeclaringClass();
}
}