/* | |
* 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.dubbo.rpc.protocol; | |
import org.apache.dubbo.common.URL; | |
import org.apache.dubbo.common.constants.CommonConstants; | |
import org.apache.dubbo.common.extension.Activate; | |
import org.apache.dubbo.common.extension.ExtensionLoader; | |
import org.apache.dubbo.common.utils.UrlUtils; | |
import org.apache.dubbo.rpc.Exporter; | |
import org.apache.dubbo.rpc.Filter; | |
import org.apache.dubbo.rpc.Invocation; | |
import org.apache.dubbo.rpc.Invoker; | |
import org.apache.dubbo.rpc.ListenableFilter; | |
import org.apache.dubbo.rpc.Protocol; | |
import org.apache.dubbo.rpc.ProtocolServer; | |
import org.apache.dubbo.rpc.Result; | |
import org.apache.dubbo.rpc.RpcException; | |
import java.util.List; | |
import static org.apache.dubbo.common.constants.CommonConstants.REFERENCE_FILTER_KEY; | |
import static org.apache.dubbo.common.constants.CommonConstants.SERVICE_FILTER_KEY; | |
/** | |
* ListenerProtocol | |
*/ | |
@Activate(order = 100) | |
public class ProtocolFilterWrapper implements Protocol { | |
private final Protocol protocol; | |
public ProtocolFilterWrapper(Protocol protocol) { | |
if (protocol == null) { | |
throw new IllegalArgumentException("protocol == null"); | |
} | |
this.protocol = protocol; | |
} | |
private static <T> Invoker<T> buildInvokerChain(final Invoker<T> invoker, String key, String group) { | |
Invoker<T> last = invoker; | |
List<Filter> filters = ExtensionLoader.getExtensionLoader(Filter.class).getActivateExtension(invoker.getUrl(), key, group); | |
if (!filters.isEmpty()) { | |
for (int i = filters.size() - 1; i >= 0; i--) { | |
final Filter filter = filters.get(i); | |
final Invoker<T> next = last; | |
last = new Invoker<T>() { | |
@Override | |
public Class<T> getInterface() { | |
return invoker.getInterface(); | |
} | |
@Override | |
public URL getUrl() { | |
return invoker.getUrl(); | |
} | |
@Override | |
public boolean isAvailable() { | |
return invoker.isAvailable(); | |
} | |
@Override | |
public Result invoke(Invocation invocation) throws RpcException { | |
Result asyncResult; | |
try { | |
asyncResult = filter.invoke(next, invocation); | |
} catch (Exception e) { | |
if (filter instanceof ListenableFilter) { | |
ListenableFilter listenableFilter = ((ListenableFilter) filter); | |
try { | |
Filter.Listener listener = listenableFilter.listener(invocation); | |
if (listener != null) { | |
listener.onError(e, invoker, invocation); | |
} | |
} finally { | |
listenableFilter.removeListener(invocation); | |
} | |
} else if (filter instanceof Filter.Listener) { | |
Filter.Listener listener = (Filter.Listener) filter; | |
listener.onError(e, invoker, invocation); | |
} | |
throw e; | |
} finally { | |
} | |
return asyncResult.whenCompleteWithContext((r, t) -> { | |
if (filter instanceof ListenableFilter) { | |
ListenableFilter listenableFilter = ((ListenableFilter) filter); | |
Filter.Listener listener = listenableFilter.listener(invocation); | |
try { | |
if (listener != null) { | |
if (t == null) { | |
listener.onResponse(r, invoker, invocation); | |
} else { | |
listener.onError(t, invoker, invocation); | |
} | |
} | |
} finally { | |
listenableFilter.removeListener(invocation); | |
} | |
} else if (filter instanceof Filter.Listener) { | |
Filter.Listener listener = (Filter.Listener) filter; | |
if (t == null) { | |
listener.onResponse(r, invoker, invocation); | |
} else { | |
listener.onError(t, invoker, invocation); | |
} | |
} | |
}); | |
} | |
@Override | |
public void destroy() { | |
invoker.destroy(); | |
} | |
@Override | |
public String toString() { | |
return invoker.toString(); | |
} | |
}; | |
} | |
} | |
return last; | |
} | |
@Override | |
public int getDefaultPort() { | |
return protocol.getDefaultPort(); | |
} | |
@Override | |
public <T> Exporter<T> export(Invoker<T> invoker) throws RpcException { | |
if (UrlUtils.isRegistry(invoker.getUrl())) { | |
return protocol.export(invoker); | |
} | |
return protocol.export(buildInvokerChain(invoker, SERVICE_FILTER_KEY, CommonConstants.PROVIDER)); | |
} | |
@Override | |
public <T> Invoker<T> refer(Class<T> type, URL url) throws RpcException { | |
if (UrlUtils.isRegistry(url)) { | |
return protocol.refer(type, url); | |
} | |
return buildInvokerChain(protocol.refer(type, url), REFERENCE_FILTER_KEY, CommonConstants.CONSUMER); | |
} | |
@Override | |
public void destroy() { | |
protocol.destroy(); | |
} | |
@Override | |
public List<ProtocolServer> getServers() { | |
return protocol.getServers(); | |
} | |
} |