Tomcat源码---响应处理五

xuke123

　　一,响应工作我们应该从CoyoteAdapter#service方法下的

       if (!comet) {
response.finishResponse();
req.action(ActionCode.ACTION_POST_REQUEST , null);
}
　　   public void finishResponse()

        throws IOException {
// Writing leftover bytes
outputBuffer.close();
}
---------------------------------------------
public void close()
throws IOException {
if (closed)
return;
if (suspended)
return;
if ((!coyoteResponse.isCommitted())
&& (coyoteResponse.getContentLengthLong() == -1)) {
// If this didn't cause a commit of the response, the final content
// length can be calculated
if (!coyoteResponse.isCommitted()) {
coyoteResponse.setContentLength(bb.getLength());
}
}
//进去客户端的发送
doFlush(false);
closed = true;
coyoteResponse.finish();
}
---------------------------------------------------------
protected void doFlush(boolean realFlush)
throws IOException {
if (suspended)
return;
doFlush = true;
if (initial) {
//发送头部文件,这个会触发以下方法执行
coyoteResponse.sendHeaders();
initial = false;
}
if (bb.getLength() > 0) {
bb.flushBuffer();
}
doFlush = false;
if (realFlush) {
coyoteResponse.action(ActionCode.ACTION_CLIENT_FLUSH,
coyoteResponse);
// If some exception occurred earlier, or if some IOE occurred
// here, notify the servlet with an IOE
if (coyoteResponse.isExceptionPresent()) {
throw new ClientAbortException
(coyoteResponse.getErrorException());
}
}
}
　　进行一些准备工作

public void action(ActionCode actionCode, Object param) {
if (actionCode == ActionCode.ACTION_COMMIT) {
// Commit current response
if (response.isCommitted())
return;
// Validate and write response headers
//这是发送的头部文件,可跟踪下去查看
prepareResponse();
try {
outputBuffer.commit();
} catch (IOException e) {
// Set error flag
error = true;
}
} else if (actionCode == ActionCode.ACTION_ACK) {
// Acknowlege request
// Send a 100 status back if it makes sense (response not committed
// yet, and client specified an expectation for 100-continue)
if ((response.isCommitted()) || !expectation)
return;
inputBuffer.setSwallowInput(true);
try {
outputBuffer.sendAck();
} catch (IOException e) {
// Set error flag
error = true;
}
} else if (actionCode == ActionCode.ACTION_CLIENT_FLUSH) {
try {
outputBuffer.flush();
} catch (IOException e) {
// Set error flag
error = true;
response.setErrorException(e);
}
} else if (actionCode == ActionCode.ACTION_CLOSE) {
// Close
// End the processing of the current request, and stop any further
// transactions with the client
try {
outputBuffer.endRequest();
} catch (IOException e) {
// Set error flag
error = true;
}
} else if (actionCode == ActionCode.ACTION_RESET) {
// Reset response
// Note: This must be called before the response is committed
outputBuffer.reset();
} else if (actionCode == ActionCode.ACTION_CUSTOM) {
// Do nothing
} else if (actionCode == ActionCode.ACTION_START) {
started = true;
} else if (actionCode == ActionCode.ACTION_STOP) {
started = false;
} else if (actionCode == ActionCode.ACTION_REQ_SSL_ATTRIBUTE ) {
try {
if (sslSupport != null) {
Object sslO = sslSupport.getCipherSuite();
if (sslO != null)
request.setAttribute
(SSLSupport.CIPHER_SUITE_KEY, sslO);
sslO = sslSupport.getPeerCertificateChain(false);
if (sslO != null)
request.setAttribute
(SSLSupport.CERTIFICATE_KEY, sslO);
sslO = sslSupport.getKeySize();
if (sslO != null)
request.setAttribute
(SSLSupport.KEY_SIZE_KEY, sslO);
sslO = sslSupport.getSessionId();
if (sslO != null)
request.setAttribute
(SSLSupport.SESSION_ID_KEY, sslO);
}
} catch (Exception e) {
log.warn(sm.getString("http11processor.socket.ssl"), e);
}
} else if (actionCode == ActionCode.ACTION_REQ_HOST_ADDR_ATTRIBUTE) {
if ((remoteAddr == null) && (socket != null)) {
InetAddress inetAddr = socket.getInetAddress();
if (inetAddr != null) {
remoteAddr = inetAddr.getHostAddress();
}
}
request.remoteAddr().setString(remoteAddr);
} else if (actionCode == ActionCode.ACTION_REQ_LOCAL_NAME_ATTRIBUTE) {
if ((localName == null) && (socket != null)) {
InetAddress inetAddr = socket.getLocalAddress();
if (inetAddr != null) {
localName = inetAddr.getHostName();
}
}
request.localName().setString(localName);
} else if (actionCode == ActionCode.ACTION_REQ_HOST_ATTRIBUTE) {
if ((remoteHost == null) && (socket != null)) {
InetAddress inetAddr = socket.getInetAddress();
if (inetAddr != null) {
remoteHost = inetAddr.getHostName();
}
if(remoteHost == null) {
if(remoteAddr != null) {
remoteHost = remoteAddr;
} else { // all we can do is punt
request.remoteHost().recycle();
}
}
}
request.remoteHost().setString(remoteHost);
} else if (actionCode == ActionCode.ACTION_REQ_LOCAL_ADDR_ATTRIBUTE) {
if (localAddr == null)
localAddr = socket.getLocalAddress().getHostAddress();
request.localAddr().setString(localAddr);
} else if (actionCode == ActionCode.ACTION_REQ_REMOTEPORT_ATTRIBUTE) {
if ((remotePort == -1 ) && (socket !=null)) {
remotePort = socket.getPort();
}
request.setRemotePort(remotePort);
} else if (actionCode == ActionCode.ACTION_REQ_LOCALPORT_ATTRIBUTE) {
if ((localPort == -1 ) && (socket !=null)) {
localPort = socket.getLocalPort();
}
request.setLocalPort(localPort);
} else if (actionCode == ActionCode.ACTION_REQ_SSL_CERTIFICATE) {
if( sslSupport != null) {
/*
* Consume and buffer the request body, so that it does not
* interfere with the client's handshake messages
*/
InputFilter[] inputFilters = inputBuffer.getFilters();
((BufferedInputFilter) inputFilters[Constants.BUFFERED_FILTER])
.setLimit(maxSavePostSize);
inputBuffer.addActiveFilter
(inputFilters[Constants.BUFFERED_FILTER]);
try {
Object sslO = sslSupport.getPeerCertificateChain(true);
if( sslO != null) {
request.setAttribute
(SSLSupport.CERTIFICATE_KEY, sslO);
}
} catch (Exception e) {
log.warn(sm.getString("http11processor.socket.ssl"), e);
}
}
} else if (actionCode == ActionCode.ACTION_REQ_SET_BODY_REPLAY) {
ByteChunk body = (ByteChunk) param;
InputFilter savedBody = new SavedRequestInputFilter(body);
savedBody.setRequest(request);
InternalInputBuffer internalBuffer = (InternalInputBuffer)
request.getInputBuffer();
internalBuffer.addActiveFilter(savedBody);
}
}
 　　以上是tomcat中简单的请求与响应的逻辑过程,还有很多不理解的,以后会慢慢的注释上去,之后的文章中会对其servletcontext,session,request,跳转,以及使用的lifecycle进行的日记通知还有stringmessage类,容器,还有其设计等....进行理解