/*
* Copyright 1999-2011 Alibaba Group.
*
* 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 com.alibaba.dubbo.rpc.filter;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import com.alibaba.dubbo.common.Constants;
import com.alibaba.dubbo.common.Extension;
import com.alibaba.dubbo.common.logger.Logger;
import com.alibaba.dubbo.common.logger.LoggerFactory;
import com.alibaba.dubbo.common.utils.PojoUtils;
import com.alibaba.dubbo.common.utils.ReflectUtils;
import com.alibaba.dubbo.rpc.Filter;
import com.alibaba.dubbo.rpc.Invocation;
import com.alibaba.dubbo.rpc.Invoker;
import com.alibaba.dubbo.rpc.Result;
import com.alibaba.dubbo.rpc.RpcException;
import com.alibaba.dubbo.rpc.RpcInvocation;
import com.alibaba.dubbo.rpc.RpcResult;
import com.alibaba.dubbo.rpc.service.GenericException;
/**
* GenericImplInvokerFilter
*
* @author william.liangf
*/
@Extension("genericimpl")
public class GenericImplFilter implements Filter {
private static final Logger logger = LoggerFactory.getLogger(GenericImplFilter.class);
private static final Class<?>[] GENERIC_PARAMETER_TYPES = new Class<?>[] {String.class, String[].class, Object[].class};
public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
if (invoker.getUrl().getParameter(Constants.GENERIC_KEY, false)
&& ! Constants.$INVOKE.equals(invocation.getMethodName())
&& invocation instanceof RpcInvocation) {
RpcInvocation invocation2 = (RpcInvocation) invocation;
String methodName = invocation2.getMethodName();
Class<?>[] parameterTypes = invocation2.getParameterTypes();
Object[] arguments = invocation2.getArguments();
String[] types = new String[parameterTypes.length];
for (int i = 0; i < parameterTypes.length; i ++) {
types[i] = ReflectUtils.getName(parameterTypes[i]);
}
Object[] args = PojoUtils.generalize(arguments);
invocation2.setMethodName(Constants.$INVOKE);
invocation2.setParameterTypes(GENERIC_PARAMETER_TYPES);
invocation2.setArguments(new Object[] {methodName, types, args});
Result result = invoker.invoke(invocation2);
if (! result.hasException()) {
Object value = result.getResult();
try {
return new RpcResult(PojoUtils.realize(value, invoker.getInterface().getMethod(methodName, parameterTypes).getReturnType()));
} catch (NoSuchMethodException e) {
throw new RpcException(e.getMessage(), e);
}
} else if (result.getException() instanceof GenericException) {
GenericException exception = (GenericException) result.getException();
try {
String className = exception.getExceptionClass();
Class<?> clazz = ReflectUtils.forName(className);
Throwable targetException = null;
Throwable lastException = null;
try {
targetException = (Throwable) clazz.newInstance();
} catch (Throwable e) {
lastException = e;
for (Constructor<?> constructor : clazz.getConstructors()) {
try {
targetException = (Throwable) constructor.newInstance(new Object[constructor.getParameterTypes().length]);
break;
} catch (Throwable e1) {
lastException = e1;
}
}
}
if (targetException != null) {
try {
Field field = Throwable.class.getDeclaredField("detailMessage");
if (! field.isAccessible()) {
field.setAccessible(true);
}
field.set(targetException, exception.getExceptionMessage());
} catch (Throwable e) {
logger.warn(e.getMessage(), e);
}
result = new RpcResult(targetException);
} else if (lastException != null) {
throw lastException;
}
} catch (Throwable e) {
throw new RpcException("Can not deserialize exception " + exception.getExceptionClass() + ", message: " + exception.getExceptionMessage(), e);
}
}
return result;
}
return invoker.invoke(invocation);
}
}