/*
* 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.protocol;
import java.lang.reflect.InvocationTargetException;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import com.alibaba.dubbo.common.URL;
import com.alibaba.dubbo.common.Version;
import com.alibaba.dubbo.common.logger.Logger;
import com.alibaba.dubbo.common.logger.LoggerFactory;
import com.alibaba.dubbo.common.utils.NetUtils;
import com.alibaba.dubbo.rpc.Invoker;
import com.alibaba.dubbo.rpc.RpcContext;
import com.alibaba.dubbo.rpc.RpcException;
import com.alibaba.dubbo.rpc.Invocation;
import com.alibaba.dubbo.rpc.Result;
import com.alibaba.dubbo.rpc.RpcInvocation;
import com.alibaba.dubbo.rpc.RpcResult;
/**
* AbstractInvoker.
*
* @author qian.lei
* @author william.liangf
*/
public abstract class AbstractInvoker<T> implements Invoker<T> {
protected final Logger logger = LoggerFactory.getLogger(getClass());
private final Class<T> type;
private final URL url;
private final Map<String, String> attachment;
private volatile boolean available = true;
private volatile boolean destroyed = false;
public AbstractInvoker(Class<T> type, URL url){
this(type, url, (Map<String, String>) null);
}
public AbstractInvoker(Class<T> type, URL url, String[] keys) {
this(type, url, convertAttachment(url, keys));
}
public AbstractInvoker(Class<T> type, URL url, Map<String, String> attachment) {
if (type == null)
throw new IllegalArgumentException("service type == null");
if (url == null)
throw new IllegalArgumentException("service url == null");
this.type = type;
this.url = url;
this.attachment = attachment == null ? null : Collections.unmodifiableMap(attachment);
}
private static Map<String, String> convertAttachment(URL url, String[] keys) {
if (keys == null || keys.length == 0) {
return null;
}
Map<String, String> attachment = new HashMap<String, String>();
for (String key : keys) {
String value = url.getParameter(key);
if (value != null && value.length() > 0) {
attachment.put(key, value);
}
}
return attachment;
}
public Class<T> getInterface() {
return type;
}
public URL getUrl() {
return url;
}
public boolean isAvailable() {
return available;
}
protected void setAvailable(boolean available) {
this.available = available;
}
public void destroy() {
if (isDestroyed()) {
return;
}
destroyed = true;
setAvailable(false);
}
public boolean isDestroyed() {
return destroyed;
}
public String toString() {
return getInterface() + " -> " + getUrl()==null?" ":getUrl().toString();
}
public Result invoke(Invocation inv) throws RpcException {
if(destroyed) {
throw new RpcException("Rpc invoker for service " + this + " on consumer " + NetUtils.getLocalHost()
+ " use dubbo version " + Version.getVersion()
+ " is DESTROYED, can not be invoked any more!");
}
RpcInvocation invocation = (RpcInvocation) inv;
invocation.setUrl(getUrl());
Map<String, String> attachments = new HashMap<String, String>();
if (attachment != null && attachment.size() > 0) {
attachments.putAll(attachment);
}
Map<String, String> context = RpcContext.getContext().getAttachments();
if (context != null) {
attachments.putAll(context);
}
if (invocation.getAttachments() != null) {
attachments.putAll(invocation.getAttachments());
}
invocation.setAttachments(attachments);
try {
return doInvoke(invocation);
} catch (InvocationTargetException e) { // biz exception
Throwable te = e.getTargetException();
if (te == null) {
return new RpcResult(e);
} else {
if (te instanceof RpcException) {
((RpcException) te).setCode(RpcException.BIZ_EXCEPTION);
}
return new RpcResult(te);
}
} catch (RpcException e) {
if (e.isBiz()) {
return new RpcResult(e);
} else {
throw e;
}
} catch (Throwable e) {
return new RpcResult(e);
}
}
protected abstract Result doInvoke(Invocation invocation) throws Throwable;
}