dubbo RpcContext 源码
dubbo RpcContext 代码
文件路径：/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/RpcContext.java
/*
* 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;
import org.apache.dubbo.common.Experimental;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.threadlocal.InternalThreadLocal;
import org.apache.dubbo.common.utils.StringUtils;
import java.net.InetSocketAddress;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Future;
/**
* Thread local context. (API, ThreadLocal, ThreadSafe)
* <p>
* Note: RpcContext is a temporary state holder. States in RpcContext changes every time when request is sent or received.
* <p/>
* There are four kinds of RpcContext, which are ServerContext, ClientAttachment, ServerAttachment and ServiceContext.
* <p/>
* ServiceContext: Using to pass environment parameters in the whole invocation. For example, `remotingApplicationName`,
* `remoteAddress`, etc. {@link RpcServiceContext}
* ClientAttachment, ServerAttachment and ServiceContext are using to transfer attachments.
* Imaging a situation like this, A is calling B, and B will call C, after that, B wants to return some attachments back to A.
* ClientAttachment is using to pass attachments to next hop as a consumer. ( A --> B , in A side)
* ServerAttachment is using to fetch attachments from previous hop as a provider. ( A --> B , in B side)
* ServerContext is using to return some attachments back to client as a provider. ( A <-- B , in B side)
* The reason why using `ServiceContext` is to make API compatible with previous.
*
* @export
* @see org.apache.dubbo.rpc.filter.ContextFilter
*/
public class RpcContext {
private static final RpcContext AGENT = new RpcContext();
/**
* use internal thread local to improve performance
*/
private static final InternalThreadLocal<RpcContextAttachment> SERVER_LOCAL = new InternalThreadLocal<RpcContextAttachment>() {
@Override
protected RpcContextAttachment initialValue() {
return new RpcContextAttachment();
}
};
private static final InternalThreadLocal<RpcContextAttachment> CLIENT_ATTACHMENT = new InternalThreadLocal<RpcContextAttachment>() {
@Override
protected RpcContextAttachment initialValue() {
return new RpcContextAttachment();
}
};
private static final InternalThreadLocal<RpcContextAttachment> SERVER_ATTACHMENT = new InternalThreadLocal<RpcContextAttachment>() {
@Override
protected RpcContextAttachment initialValue() {
return new RpcContextAttachment();
}
};
private static final InternalThreadLocal<RpcServiceContext> SERVICE_CONTEXT = new InternalThreadLocal<RpcServiceContext>() {
@Override
protected RpcServiceContext initialValue() {
return new RpcServiceContext();
}
};
/**
* use by cancel call
*/
private static final InternalThreadLocal<CancellationContext> CANCELLATION_CONTEXT = new InternalThreadLocal<CancellationContext>() {
@Override
protected CancellationContext initialValue() {
return new CancellationContext();
}
};
public static CancellationContext getCancellationContext() {
return CANCELLATION_CONTEXT.get();
}
public static void removeCancellationContext() {
CANCELLATION_CONTEXT.remove();
}
public static void restoreCancellationContext(CancellationContext oldContext) {
CANCELLATION_CONTEXT.set(oldContext);
}
private boolean remove = true;
protected RpcContext() {
}
/**
* get server side context. ( A <-- B , in B side)
*
* @return server context
*/
public static RpcContextAttachment getServerContext() {
return SERVER_LOCAL.get();
}
/**
* remove server side context.
*
* @see org.apache.dubbo.rpc.filter.ContextFilter
*/
public static void removeServerContext() {
SERVER_LOCAL.remove();
}
/**
* get context.
*
* @return context
*/
@Deprecated
public static RpcContext getContext() {
return AGENT;
}
/**
* get consumer side attachment ( A --> B , in A side)
*
* @return context
*/
public static RpcContextAttachment getClientAttachment() {
return CLIENT_ATTACHMENT.get();
}
/**
* get provider side attachment from consumer ( A --> B , in B side)
*
* @return context
*/
public static RpcContextAttachment getServerAttachment() {
return SERVER_ATTACHMENT.get();
}
public boolean canRemove() {
return remove;
}
public void clearAfterEachInvoke(boolean remove) {
this.remove = remove;
}
/**
* Using to pass environment parameters in the whole invocation. For example, `remotingApplicationName`,
* `remoteAddress`, etc. {@link RpcServiceContext}
*
* @return context
*/
public static RpcServiceContext getServiceContext() {
return SERVICE_CONTEXT.get();
}
public static RpcServiceContext getCurrentServiceContext() {
return SERVICE_CONTEXT.getWithoutInitialize();
}
public static void removeServiceContext() {
SERVICE_CONTEXT.remove();
}
public static void removeClientAttachment() {
if (CLIENT_ATTACHMENT.get().canRemove()) {
CLIENT_ATTACHMENT.remove();
}
}
public static void removeServerAttachment() {
if (SERVER_ATTACHMENT.get().canRemove()) {
SERVER_ATTACHMENT.remove();
}
}
/**
* customized for internal use.
*/
public static void removeContext() {
if (CLIENT_ATTACHMENT.get().canRemove()) {
CLIENT_ATTACHMENT.remove();
}
if (SERVER_ATTACHMENT.get().canRemove()) {
SERVER_ATTACHMENT.remove();
}
SERVER_LOCAL.remove();
SERVICE_CONTEXT.remove();
CANCELLATION_CONTEXT.remove();
}
/**
* Get the request object of the underlying RPC protocol, e.g. HttpServletRequest
*
* @return null if the underlying protocol doesn't provide support for getting request
*/
public Object getRequest() {
return SERVICE_CONTEXT.get().getRequest();
}
public void setRequest(Object request) {
SERVICE_CONTEXT.get().setRequest(request);
}
/**
* Get the request object of the underlying RPC protocol, e.g. HttpServletRequest
*
* @return null if the underlying protocol doesn't provide support for getting request or the request is not of the specified type
*/
@SuppressWarnings("unchecked")
public <T> T getRequest(Class<T> clazz) {
return SERVICE_CONTEXT.get().getRequest(clazz);
}
/**
* Get the response object of the underlying RPC protocol, e.g. HttpServletResponse
*
* @return null if the underlying protocol doesn't provide support for getting response
*/
public Object getResponse() {
return SERVICE_CONTEXT.get().getResponse();
}
public void setResponse(Object response) {
SERVICE_CONTEXT.get().setResponse(response);
}
/**
* Get the response object of the underlying RPC protocol, e.g. HttpServletResponse
*
* @return null if the underlying protocol doesn't provide support for getting response or the response is not of the specified type
*/
@SuppressWarnings("unchecked")
public <T> T getResponse(Class<T> clazz) {
return SERVICE_CONTEXT.get().getResponse(clazz);
}
/**
* is provider side.
*
* @return provider side.
*/
public boolean isProviderSide() {
return SERVICE_CONTEXT.get().isProviderSide();
}
/**
* is consumer side.
*
* @return consumer side.
*/
public boolean isConsumerSide() {
return SERVICE_CONTEXT.get().isConsumerSide();
}
/**
* get CompletableFuture.
*
* @param <T>
* @return future
*/
@SuppressWarnings("unchecked")
public <T> CompletableFuture<T> getCompletableFuture() {
return SERVICE_CONTEXT.get().getCompletableFuture();
}
/**
* get future.
*
* @param <T>
* @return future
*/
@SuppressWarnings("unchecked")
public <T> Future<T> getFuture() {
return SERVICE_CONTEXT.get().getFuture();
}
/**
* set future.
*
* @param future
*/
public void setFuture(CompletableFuture<?> future) {
SERVICE_CONTEXT.get().setFuture(future);
}
public List<URL> getUrls() {
return SERVICE_CONTEXT.get().getUrls();
}
public void setUrls(List<URL> urls) {
SERVICE_CONTEXT.get().setUrls(urls);
}
public URL getUrl() {
return SERVICE_CONTEXT.get().getUrl();
}
public void setUrl(URL url) {
SERVICE_CONTEXT.get().setUrl(url);
}
/**
* get method name.
*
* @return method name.
*/
public String getMethodName() {
return SERVICE_CONTEXT.get().getMethodName();
}
public void setMethodName(String methodName) {
SERVICE_CONTEXT.get().setMethodName(methodName);
}
/**
* get parameter types.
*
* @serial
*/
public Class<?>[] getParameterTypes() {
return SERVICE_CONTEXT.get().getParameterTypes();
}
public void setParameterTypes(Class<?>[] parameterTypes) {
SERVICE_CONTEXT.get().setParameterTypes(parameterTypes);
}
/**
* get arguments.
*
* @return arguments.
*/
public Object[] getArguments() {
return SERVICE_CONTEXT.get().getArguments();
}
public void setArguments(Object[] arguments) {
SERVICE_CONTEXT.get().setArguments(arguments);
}
/**
* set local address.
*
* @param host
* @param port
* @return context
*/
public RpcContext setLocalAddress(String host, int port) {
return SERVICE_CONTEXT.get().setLocalAddress(host, port);
}
/**
* get local address.
*
* @return local address
*/
public InetSocketAddress getLocalAddress() {
return SERVICE_CONTEXT.get().getLocalAddress();
}
/**
* set local address.
*
* @param address
* @return context
*/
public RpcContext setLocalAddress(InetSocketAddress address) {
return SERVICE_CONTEXT.get().setLocalAddress(address);
}
public String getLocalAddressString() {
return SERVICE_CONTEXT.get().getLocalAddressString();
}
/**
* get local host name.
*
* @return local host name
*/
public String getLocalHostName() {
return SERVICE_CONTEXT.get().getLocalHostName();
}
/**
* set remote address.
*
* @param host
* @param port
* @return context
*/
public RpcContext setRemoteAddress(String host, int port) {
return SERVICE_CONTEXT.get().setRemoteAddress(host, port);
}
/**
* get remote address.
*
* @return remote address
*/
public InetSocketAddress getRemoteAddress() {
return SERVICE_CONTEXT.get().getRemoteAddress();
}
/**
* set remote address.
*
* @param address
* @return context
*/
public RpcContext setRemoteAddress(InetSocketAddress address) {
return SERVICE_CONTEXT.get().setRemoteAddress(address);
}
public String getRemoteApplicationName() {
return SERVICE_CONTEXT.get().getRemoteApplicationName();
}
public RpcContext setRemoteApplicationName(String remoteApplicationName) {
return SERVICE_CONTEXT.get().setRemoteApplicationName(remoteApplicationName);
}
/**
* get remote address string.
*
* @return remote address string.
*/
public String getRemoteAddressString() {
return SERVICE_CONTEXT.get().getRemoteAddressString();
}
/**
* get remote host name.
*
* @return remote host name
*/
public String getRemoteHostName() {
return SERVICE_CONTEXT.get().getRemoteHostName();
}
/**
* get local host.
*
* @return local host
*/
public String getLocalHost() {
return SERVICE_CONTEXT.get().getLocalHost();
}
/**
* get local port.
*
* @return port
*/
public int getLocalPort() {
return SERVICE_CONTEXT.get().getLocalPort();
}
/**
* get remote host.
*
* @return remote host
*/
public String getRemoteHost() {
return SERVICE_CONTEXT.get().getRemoteHost();
}
/**
* get remote port.
*
* @return remote port
*/
public int getRemotePort() {
return SERVICE_CONTEXT.get().getRemotePort();
}
/**
* also see {@link #getObjectAttachment(String)}.
*
* @param key
* @return attachment
*/
public String getAttachment(String key) {
String client = CLIENT_ATTACHMENT.get().getAttachment(key);
if (StringUtils.isEmpty(client)) {
return SERVER_ATTACHMENT.get().getAttachment(key);
}
return client;
}
/**
* get attachment.
*
* @param key
* @return attachment
*/
@Experimental("Experiment api for supporting Object transmission")
public Object getObjectAttachment(String key) {
Object client = CLIENT_ATTACHMENT.get().getObjectAttachment(key);
if (client == null) {
return SERVER_ATTACHMENT.get().getObjectAttachment(key);
}
return client;
}
/**
* set attachment.
*
* @param key
* @param value
* @return context
*/
public RpcContext setAttachment(String key, String value) {
return setObjectAttachment(key, value);
}
public RpcContext setAttachment(String key, Object value) {
return setObjectAttachment(key, value);
}
@Experimental("Experiment api for supporting Object transmission")
public RpcContext setObjectAttachment(String key, Object value) {
// TODO compatible with previous
CLIENT_ATTACHMENT.get().setObjectAttachment(key, value);
return this;
}
/**
* remove attachment.
*
* @param key
* @return context
*/
public RpcContext removeAttachment(String key) {
CLIENT_ATTACHMENT.get().removeAttachment(key);
return this;
}
/**
* get attachments.
*
* @return attachments
*/
@Deprecated
public Map<String, String> getAttachments() {
return new AttachmentsAdapter.ObjectToStringMap(this.getObjectAttachments());
}
/**
* get attachments.
*
* @return attachments
*/
@Experimental("Experiment api for supporting Object transmission")
public Map<String, Object> getObjectAttachments() {
Map<String, Object> result = new HashMap<>((int) ((CLIENT_ATTACHMENT.get().attachments.size() + SERVER_ATTACHMENT.get().attachments.size()) / .75) + 1);
result.putAll(SERVER_ATTACHMENT.get().attachments);
result.putAll(CLIENT_ATTACHMENT.get().attachments);
return result;
}
/**
* set attachments
*
* @param attachment
* @return context
*/
public RpcContext setAttachments(Map<String, String> attachment) {
CLIENT_ATTACHMENT.get().attachments.clear();
if (attachment != null && attachment.size() > 0) {
CLIENT_ATTACHMENT.get().attachments.putAll(attachment);
}
return this;
}
/**
* set attachments
*
* @param attachment
* @return context
*/
@Experimental("Experiment api for supporting Object transmission")
public RpcContext setObjectAttachments(Map<String, Object> attachment) {
CLIENT_ATTACHMENT.get().attachments.clear();
if (attachment != null && attachment.size() > 0) {
CLIENT_ATTACHMENT.get().attachments.putAll(attachment);
}
return this;
}
public void clearAttachments() {
CLIENT_ATTACHMENT.get().attachments.clear();
}
/**
* get values.
*
* @return values
*/
@Deprecated
public Map<String, Object> get() {
return CLIENT_ATTACHMENT.get().get();
}
/**
* set value.
*
* @param key
* @param value
* @return context
*/
@Deprecated
public RpcContext set(String key, Object value) {
CLIENT_ATTACHMENT.get().set(key, value);
return this;
}
/**
* remove value.
*
* @param key
* @return value
*/
@Deprecated
public RpcContext remove(String key) {
CLIENT_ATTACHMENT.get().remove(key);
return this;
}
/**
* get value.
*
* @param key
* @return value
*/
@Deprecated
public Object get(String key) {
return CLIENT_ATTACHMENT.get().get(key);
}
/**
* @deprecated Replace to isProviderSide()
*/
@Deprecated
public boolean isServerSide() {
return SERVICE_CONTEXT.get().isServerSide();
}
/**
* @deprecated Replace to isConsumerSide()
*/
@Deprecated
public boolean isClientSide() {
return SERVICE_CONTEXT.get().isClientSide();
}
/**
* @deprecated Replace to getUrls()
*/
@Deprecated
@SuppressWarnings({"unchecked", "rawtypes"})
public List<Invoker<?>> getInvokers() {
return SERVICE_CONTEXT.get().getInvokers();
}
public RpcContext setInvokers(List<Invoker<?>> invokers) {
return SERVICE_CONTEXT.get().setInvokers(invokers);
}
/**
* @deprecated Replace to getUrl()
*/
@Deprecated
public Invoker<?> getInvoker() {
return SERVICE_CONTEXT.get().getInvoker();
}
public RpcContext setInvoker(Invoker<?> invoker) {
return SERVICE_CONTEXT.get().setInvoker(invoker);
}
/**
* @deprecated Replace to getMethodName(), getParameterTypes(), getArguments()
*/
@Deprecated
public Invocation getInvocation() {
return SERVICE_CONTEXT.get().getInvocation();
}
public RpcContext setInvocation(Invocation invocation) {
return SERVICE_CONTEXT.get().setInvocation(invocation);
}
/**
* Async invocation. Timeout will be handled even if <code>Future.get()</code> is not called.
*
* @param callable
* @return get the return result from <code>future.get()</code>
*/
@SuppressWarnings("unchecked")
public <T> CompletableFuture<T> asyncCall(Callable<T> callable) {
return SERVICE_CONTEXT.get().asyncCall(callable);
}
/**
* one way async call, send request only, and result is not required
*
* @param runnable
*/
public void asyncCall(Runnable runnable) {
SERVICE_CONTEXT.get().asyncCall(runnable);
}
/**
* @return
* @throws IllegalStateException
*/
@SuppressWarnings("unchecked")
public static AsyncContext startAsync() throws IllegalStateException {
return RpcContextAttachment.startAsync();
}
protected void setAsyncContext(AsyncContext asyncContext) {
SERVER_ATTACHMENT.get().setAsyncContext(asyncContext);
}
public boolean isAsyncStarted() {
return SERVER_ATTACHMENT.get().isAsyncStarted();
}
public boolean stopAsync() {
return SERVER_ATTACHMENT.get().stopAsync();
}
public AsyncContext getAsyncContext() {
return SERVER_ATTACHMENT.get().getAsyncContext();
}
public String getGroup() {
return SERVICE_CONTEXT.get().getGroup();
}
public String getVersion() {
return SERVICE_CONTEXT.get().getVersion();
}
public String getInterfaceName() {
return SERVICE_CONTEXT.get().getInterfaceName();
}
public String getProtocol() {
return SERVICE_CONTEXT.get().getProtocol();
}
public String getServiceKey() {
return SERVICE_CONTEXT.get().getServiceKey();
}
public String getProtocolServiceKey() {
return SERVICE_CONTEXT.get().getProtocolServiceKey();
}
public URL getConsumerUrl() {
return SERVICE_CONTEXT.get().getConsumerUrl();
}
public void setConsumerUrl(URL consumerUrl) {
SERVICE_CONTEXT.get().setConsumerUrl(consumerUrl);
}
@Deprecated
public static void setRpcContext(URL url) {
RpcServiceContext.getServiceContext().setConsumerUrl(url);
}
protected static RestoreContext clearAndStoreContext() {
RestoreContext restoreContext = new RestoreContext();
RpcContext.removeContext();
return restoreContext;
}
protected static RestoreContext storeContext() {
return new RestoreContext();
}
public static RestoreServiceContext storeServiceContext() {
return new RestoreServiceContext();
}
public static void restoreServiceContext(RestoreServiceContext restoreServiceContext) {
if (restoreServiceContext != null) {
restoreServiceContext.restore();
}
}
protected static void restoreContext(RestoreContext restoreContext) {
if (restoreContext != null) {
restoreContext.restore();
}
}
/**
* Used to temporarily store and restore all kinds of contexts of current thread.
*/
public static class RestoreContext {
private final RpcServiceContext serviceContext;
private final RpcContextAttachment clientAttachment;
private final RpcContextAttachment serverAttachment;
private final RpcContextAttachment serverLocal;
public RestoreContext() {
serviceContext = getServiceContext().copyOf(false);
clientAttachment = getClientAttachment().copyOf(false);
serverAttachment = getServerAttachment().copyOf(false);
serverLocal = getServerContext().copyOf(false);
}
public void restore() {
if (serviceContext != null) {
SERVICE_CONTEXT.set(serviceContext);
} else {
removeServiceContext();
}
if (clientAttachment != null) {
CLIENT_ATTACHMENT.set(clientAttachment);
} else {
removeClientAttachment();
}
if (serverAttachment != null) {
SERVER_ATTACHMENT.set(serverAttachment);
} else {
removeServerAttachment();
}
if (serverLocal != null) {
SERVER_LOCAL.set(serverLocal);
} else {
removeServerContext();
}
}
}
public static class RestoreServiceContext {
private final RpcServiceContext serviceContext;
public RestoreServiceContext() {
RpcServiceContext originContext = getCurrentServiceContext();
if (originContext == null) {
this.serviceContext = null;
} else {
this.serviceContext = originContext.copyOf(true);
}
}
protected void restore() {
if (serviceContext != null) {
SERVICE_CONTEXT.set(serviceContext);
} else {
removeServiceContext();
}
}
}
}
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