這篇講Catalina.initialize()的過程，下面是相關的UML
// Start the new server
if (server instanceof Lifecycle) { //判斷Server是否實現Lifecycle接口，如果實現的話，調用initialize
try {
server.initialize();
} catch (LifecycleException e) {
log.error("Catalina.start", e);
}
}2.StandardServer.initialize()
/**
* Invoke a pre-startup initialization. This is used to allow connectors
* to bind to restricted ports under Unix operating environments.
* 調用開始前的初始化，用來綁定在unix操作系統環境下受限制的端口
*/
public void initialize()
throws LifecycleException
{
if (initialized) {
log.info(sm.getString("standardServer.initialize.initialized"));
return;
}
lifecycle.fireLifecycleEvent(INIT_EVENT, null);//觸發init事件
initialized = true;
if( oname==null ) { //把server對象註冊到mbean裏面,後面創建的變量一般都是註冊到mbean,方便管理
try {
oname=new ObjectName( "Catalina:type=Server");
Registry.getRegistry(null, null)
.registerComponent(this, oname, null );
} catch (Exception e) {
log.error("Error registering ",e);
}
}
// Register global String cache
try {
ObjectName oname2 =
new ObjectName(oname.getDomain() + ":type=StringCache");
Registry.getRegistry(null, null)
.registerComponent(new StringCache(), oname2, null );
} catch (Exception e) {
log.error("Error registering ",e);
}
// Initialize our defined Services
for (int i = 0; i < services.length; i++) {
services[i].initialize();
}
}3.StandardService.initialize()
public void initialize()
throws LifecycleException
{
// Service shouldn't be used with embeded, so it doesn't matter
if (initialized) {
if(log.isInfoEnabled())
log.info(sm.getString("standardService.initialize.initialized"));
return;
}
initialized = true;
if( oname==null ) {
try {
// Hack - Server should be deprecated...
Container engine=this.getContainer();
domain=engine.getName();
oname=new ObjectName(domain + ":type=Service,serviceName="+name);
this.controller=oname;
Registry.getRegistry(null, null)
.registerComponent(this, oname, null);
Executor[] executors = findExecutors();
for (int i = 0; i < executors.length; i++) {
ObjectName executorObjectName =
new ObjectName(domain + ":type=Executor,name=" + executors[i].getName());
Registry.getRegistry(null, null)
.registerComponent(executors[i], executorObjectName, null);
}
} catch (Exception e) {
log.error(sm.getString("standardService.register.failed",domain),e);
}
}
if( server==null ) {
// Register with the server
// HACK: ServerFactory should be removed...
ServerFactory.getServer().addService(this);
}
// Initialize our defined Connectors
synchronized (connectors) {//這裏在server.xml配置了兩個connector.HTTP/1.1、AJP/1.3
for (int i = 0; i < connectors.length; i++) {
connectors[i].initialize();
}
}
}4.Connector.initialize()
public void initialize()
throws LifecycleException
{
if (initialized) {
if(log.isInfoEnabled())
log.info(sm.getString("coyoteConnector.alreadyInitialized"));
return;
}
this.initialized = true;
if( oname == null && (container instanceof StandardEngine)) {
try {
// we are loaded directly, via API - and no name was given to us
StandardEngine cb=(StandardEngine)container;
oname = createObjectName(cb.getName(), "Connector");
Registry.getRegistry(null, null)
.registerComponent(this, oname, null);
controller=oname;
} catch (Exception e) {
log.error( "Error registering connector ", e);
}
if(log.isDebugEnabled())
log.debug("Creating name for connector " + oname);
}
// Initializa adapter
adapter = new CoyoteAdapter(this);//設置爲Coyote connector
protocolHandler.setAdapter(adapter);
IntrospectionUtils.setProperty(protocolHandler, "jkHome",
System.getProperty("catalina.base"));
try {
protocolHandler.init();
} catch (Exception e) {
throw new LifecycleException
(sm.getString
("coyoteConnector.protocolHandlerInitializationFailed", e));
}
}上面的調用了protocolHandler.init方法，那麼protocolHandler是怎麼實例化的呢？
public Connector(String protocol)
throws Exception {
setProtocol(protocol);
// Instantiate protocol handler
try {
Class clazz = Class.forName(protocolHandlerClassName);
this.protocolHandler = (ProtocolHandler) clazz.newInstance();
} catch (Exception e) {
log.error
(sm.getString
("coyoteConnector.protocolHandlerInstantiationFailed", e));
}
}public void setProtocol(String protocol) {
// Test APR support initializeAPR();
if (aprInitialized) { if ("HTTP/1.1".equals(protocol)) { setProtocolHandlerClassName ("org.apache.coyote.http11.Http11AprProtocol"); } else if ("AJP/1.3".equals(protocol)) { setProtocolHandlerClassName ("org.apache.coyote.ajp.AjpAprProtocol"); } else if (protocol != null) { setProtocolHandlerClassName(protocol); } else { setProtocolHandlerClassName ("org.apache.coyote.http11.Http11AprProtocol"); } } else { if ("HTTP/1.1".equals(protocol)) { setProtocolHandlerClassName ("org.apache.coyote.http11.Http11Protocol"); } else if ("AJP/1.3".equals(protocol)) { setProtocolHandlerClassName ("org.apache.jk.server.JkCoyoteHandler"); } else if (protocol != null) { setProtocolHandlerClassName(protocol); } }
}
根據server.xml配置的connector協議實例化相應的Protocol.
5.Http11Protocol.init()
public void init() throws Exception {
endpoint.setName(getName());
endpoint.setHandler(cHandler);
// Verify the validity of the configured socket factory
try {
if (isSSLEnabled()) {
sslImplementation =
SSLImplementation.getInstance(sslImplementationName);
socketFactory = sslImplementation.getServerSocketFactory();
endpoint.setServerSocketFactory(socketFactory);
} else if (socketFactoryName != null) {
socketFactory = (ServerSocketFactory) Class.forName(socketFactoryName).newInstance();
endpoint.setServerSocketFactory(socketFactory);
}
} catch (Exception ex) {
log.error(sm.getString("http11protocol.socketfactory.initerror"),
ex);
throw ex;
}
if (socketFactory!=null) {
Iterator<String> attE = attributes.keySet().iterator();
while( attE.hasNext() ) {
String key = attE.next();
Object v=attributes.get(key);
socketFactory.setAttribute(key, v);
}
}
try {
endpoint.init();
} catch (Exception ex) {
log.error(sm.getString("http11protocol.endpoint.initerror"), ex);
throw ex;
}
if (log.isInfoEnabled())
log.info(sm.getString("http11protocol.init", getName()));
}
這裏判斷服務器是否打開SSL,如果沒有，就調用JIoEndpoint.init()
6.JIoEndpoint.init()
/**
* 創建server socket
*/
public void init()
throws Exception {
if (initialized)
return;
// Initialize thread count defaults for acceptor
if (acceptorThreadCount == 0) {
acceptorThreadCount = 1;
}
if (serverSocketFactory == null) {
serverSocketFactory = ServerSocketFactory.getDefault();
}
if (serverSocket == null) {
try {
if (address == null) {
serverSocket = serverSocketFactory.createSocket(port, backlog);
} else {
serverSocket = serverSocketFactory.createSocket(port, backlog, address);
}
} catch (BindException be) {
if (address == null)
throw new BindException(be.getMessage() + "<null>:" + port);
else
throw new BindException(be.getMessage() + " " +
address.toString() + ":" + port);
}
}
//if( serverTimeout >= 0 )
// serverSocket.setSoTimeout( serverTimeout );
initialized = true;
}這裏還不能監聽客戶端，沒有accept