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/*
* 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.Version;
import org.apache.dubbo.common.extension.ExtensionLoader;
import org.apache.dubbo.common.logger.Logger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.common.threadpool.ThreadlessExecutor;
import org.apache.dubbo.common.threadpool.manager.ExecutorRepository;
import org.apache.dubbo.common.utils.ArrayUtils;
import org.apache.dubbo.common.utils.CollectionUtils;
import org.apache.dubbo.common.utils.NetUtils;
import org.apache.dubbo.remoting.transport.CodecSupport;
import org.apache.dubbo.rpc.AsyncRpcResult;
import org.apache.dubbo.rpc.Invocation;
import org.apache.dubbo.rpc.InvokeMode;
import org.apache.dubbo.rpc.Invoker;
import org.apache.dubbo.rpc.Result;
import org.apache.dubbo.rpc.RpcContext;
import org.apache.dubbo.rpc.RpcException;
import org.apache.dubbo.rpc.RpcInvocation;
import org.apache.dubbo.rpc.protocol.dubbo.FutureAdapter;
import org.apache.dubbo.rpc.support.RpcUtils;
import java.lang.reflect.InvocationTargetException;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.atomic.AtomicBoolean;
import static org.apache.dubbo.remoting.Constants.DEFAULT_REMOTING_SERIALIZATION;
import static org.apache.dubbo.remoting.Constants.SERIALIZATION_KEY;
import static org.apache.dubbo.rpc.Constants.SERIALIZATION_ID_KEY;
/**
* This Invoker works on Consumer side.
*/
public abstract class AbstractInvoker implements Invoker {
protected final Logger logger = LoggerFactory.getLogger(getClass());
private final Class type;
private final URL url;
private final Map attachment;
private volatile boolean available = true;
private AtomicBoolean destroyed = new AtomicBoolean(false);
public AbstractInvoker(Class type, URL url) {
this(type, url, (Map) null);
}
public AbstractInvoker(Class type, URL url, String[] keys) {
this(type, url, convertAttachment(url, keys));
}
public AbstractInvoker(Class type, URL url, Map 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 convertAttachment(URL url, String[] keys) {
if (ArrayUtils.isEmpty(keys)) {
return null;
}
Map attachment = new HashMap<>();
for (String key : keys) {
String value = url.getParameter(key);
if (value != null && value.length() > 0) {
attachment.put(key, value);
}
}
return attachment;
}
@Override
public Class getInterface() {
return type;
}
@Override
public URL getUrl() {
return url;
}
@Override
public boolean isAvailable() {
return available;
}
protected void setAvailable(boolean available) {
this.available = available;
}
@Override
public void destroy() {
if (!destroyed.compareAndSet(false, true)) {
return;
}
setAvailable(false);
}
public boolean isDestroyed() {
return destroyed.get();
}
@Override
public String toString() {
return getInterface() + " -> " + (getUrl() == null ? "" : getUrl().toString());
}
@Override
public Result invoke(Invocation inv) throws RpcException {
// if invoker is destroyed due to address refresh from registry, let's allow the current invoke to proceed
if (destroyed.get()) {
logger.warn("Invoker for service " + this + " on consumer " + NetUtils.getLocalHost() + " is destroyed, "
+ ", dubbo version is " + Version.getVersion() + ", this invoker should not be used any longer");
}
RpcInvocation invocation = (RpcInvocation) inv;
invocation.setInvoker(this);
if (CollectionUtils.isNotEmptyMap(attachment)) {
invocation.addObjectAttachmentsIfAbsent(attachment);
}
Map contextAttachments = RpcContext.getContext().getObjectAttachments();
if (CollectionUtils.isNotEmptyMap(contextAttachments)) {
/**
* invocation.addAttachmentsIfAbsent(context){@link RpcInvocation#addAttachmentsIfAbsent(Map)}should not be used here,
* because the {@link RpcContext#setAttachment(String, String)} is passed in the Filter when the call is triggered
* by the built-in retry mechanism of the Dubbo. The attachment to update RpcContext will no longer work, which is
* a mistake in most cases (for example, through Filter to RpcContext output traceId and spanId and other information).
*/
invocation.addObjectAttachments(contextAttachments);
}
invocation.setInvokeMode(RpcUtils.getInvokeMode(url, invocation));
RpcUtils.attachInvocationIdIfAsync(getUrl(), invocation);
Byte serializationId = CodecSupport.getIDByName(getUrl().getParameter(SERIALIZATION_KEY, DEFAULT_REMOTING_SERIALIZATION));
if (serializationId != null) {
invocation.put(SERIALIZATION_ID_KEY, serializationId);
}
AsyncRpcResult asyncResult;
try {
asyncResult = (AsyncRpcResult) doInvoke(invocation);
} catch (InvocationTargetException e) { // biz exception
Throwable te = e.getTargetException();
if (te == null) {
asyncResult = AsyncRpcResult.newDefaultAsyncResult(null, e, invocation);
} else {
if (te instanceof RpcException) {
((RpcException) te).setCode(RpcException.BIZ_EXCEPTION);
}
asyncResult = AsyncRpcResult.newDefaultAsyncResult(null, te, invocation);
}
} catch (RpcException e) {
if (e.isBiz()) {
asyncResult = AsyncRpcResult.newDefaultAsyncResult(null, e, invocation);
} else {
throw e;
}
} catch (Throwable e) {
asyncResult = AsyncRpcResult.newDefaultAsyncResult(null, e, invocation);
}
RpcContext.getContext().setFuture(new FutureAdapter(asyncResult.getResponseFuture()));
return asyncResult;
}
protected ExecutorService getCallbackExecutor(URL url, Invocation inv) {
ExecutorService sharedExecutor = ExtensionLoader.getExtensionLoader(ExecutorRepository.class).getDefaultExtension().getExecutor(url);
if (InvokeMode.SYNC == RpcUtils.getInvokeMode(getUrl(), inv)) {
if(sharedExecutor == null) {
sharedExecutor = ExtensionLoader.getExtensionLoader(ExecutorRepository.class).getDefaultExtension().getSharedExecutor();
}
return new ThreadlessExecutor(sharedExecutor);
} else {
return sharedExecutor;
}
}
protected abstract Result doInvoke(Invocation invocation) throws Throwable;
}