tomcat 源码分析之service
service类提供服务的，可以配置多个它的初始化方法@Override
protected void initInternal() throws LifecycleException {
super.initInternal();
if (container != null) {
container.init();
}
// Initialize any Executors
for (Executor executor : findExecutors()) {
if (executor instanceof LifecycleMBeanBase) {
((LifecycleMBeanBase) executor).setDomain(getDomain());
}
executor.init();
}
// Initialize our defined Connectors
synchronized (connectors) {
for (Connector connector : connectors) {
try {
connector.init();
} catch (Exception e) {
String message = sm.getString(
"standardService.connector.initFailed", connector);
log.error(message, e);
if (Boolean.getBoolean("org.apache.catalina.startup.EXIT_ON_INIT_FAILURE"))
throw new LifecycleException(message);
}
}
}
}
从上面我们看到service包含多个Executor和connector，connection接受客户的请求然后交给executor处理
Executor的默认实现是StandardThreadExecutor
@Override
protected void startInternal() throws LifecycleException {
taskqueue = new TaskQueue(maxQueueSize);
TaskThreadFactory tf = new TaskThreadFactory(namePrefix,daemon,getThreadPriority());
executor = new ThreadPoolExecutor(getMinSpareThreads(), getMaxThreads(), maxIdleTime, TimeUnit.MILLISECONDS,taskqueue, tf);
executor.setThreadRenewalDelay(threadRenewalDelay);
if (prestartminSpareThreads) {
executor.prestartAllCoreThreads();
}
taskqueue.setParent(executor);
setState(LifecycleState.STARTING);
}
从上面我们看到其实是创建一个线程池由他负责处理请求。
下面是Connector的的构造方法
public Connector(String protocol) {
setProtocol(protocol);
// 初始化协议处理类默认是org.apache.coyote.http11.Http11Protocol
try {
Class<?> clazz = Class.forName(protocolHandlerClassName);
this.protocolHandler = (ProtocolHandler) clazz.newInstance();
} catch (Exception e) {
log.error(sm.getString(
"coyoteConnector.protocolHandlerInstantiationFailed"), e);
}
}
下面是他的初始化方法
@Override
protected void initInternal() throws LifecycleException {
super.initInternal();
//请求响应对象从连接器传送到容器需要一个桥梁
adapter = new CoyoteAdapter(this);
protocolHandler.setAdapter(adapter);
if( null == parseBodyMethodsSet ) {
setParseBodyMethods(getParseBodyMethods());
}
if (protocolHandler.isAprRequired() &&
!AprLifecycleListener.isAprAvailable()) {
throw new LifecycleException(
sm.getString("coyoteConnector.protocolHandlerNoApr",
getProtocolHandlerClassName()));
}
try {
protocolHandler.init();
} catch (Exception e) {
throw new LifecycleException
(sm.getString
("coyoteConnector.protocolHandlerInitializationFailed"), e);
}
// Initialize mapper listener
mapperListener.init();
}
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