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Tomcat7涓墍鏈夌殑榛樿瀹瑰櫒缁勪欢锛圫tandardEngine銆丼tandardHost銆丼tandardContext銆丼tandardWrapper锛夐兘浼氱户鎵跨埗绫籵rg.apache.catalina.core.ContainerBase锛屽湪杩欎簺瀹瑰櫒缁勪欢鍚姩鏃跺皢浼氳皟鐢ㄨ嚜宸卞唴閮ㄧ殑startInternal鏂规硶锛屽湪璇ユ柟娉曞唴閮ㄤ竴鑸細璋冪敤鐖剁被鐨剆tartInternal鏂规硶锛圫tandardContext绫荤殑瀹炵幇闄ゅ锛夛紝姣斿org.apache.catalina.core.StandardEngine绫讳腑鐨剆tartInternal鏂规硶锛?/p>
@Override
protected synchronized void startInternal() throws LifecycleException {
// Log our server identification information
if(log.isInfoEnabled())
log.info( "Starting Servlet Engine: " + ServerInfo.getServerInfo());
// Standard container startup
super.startInternal();
}
鏈€鍚庣殑super.startInternal()鍗宠皟鐢ㄧ埗绫籵rg.apache.catalina.core.ContainerBase鐨剆tartInternal鏂规硶锛屽湪璇ユ柟娉曟渶鍚庯細
// Start the Valves in our pipeline (including the basic), if any
if (pipeline instanceof Lifecycle)
((Lifecycle) pipeline).start();
setState(LifecycleState.STARTING);
// Start our thread
threadStart();
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// -------------------- Background Thread --------------------
/**
* Start the background thread that will periodically check for
* session timeouts.
*/
protected void threadStart() {
if (thread != null)
return;
if (backgroundProcessorDelay <= 0)
return;
threadDone = false;
String threadName = "ContainerBackgroundProcessor[" + toString() + "]";
thread = new Thread(new ContainerBackgroundProcessor(), threadName);
thread.setDaemon(true);
thread.start();
}
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/**
* Return a String representation of this component.
*/
@Override
public String toString() {
StringBuilder sb = new StringBuilder("StandardEngine[");
sb.append(getName());
sb.append("]");
return (sb.toString());
}
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浣嗚繖閲屾湁涓€涓棶棰橈紝鏃㈢劧StandardEngine銆丼tandardHost閮戒細璋冪敤super.startInternal()鏂规硶锛屾寜榛樿閰嶇疆锛屽悗鍙扮悊搴斾骇鐢熶袱涓悗鍙扮嚎绋嬶紝瀹為檯涓轰粈涔堝彧鏈変竴涓紵
鍥炲埌org.apache.catalina.core.ContainerBase鐨則hreadStart鏂规硶锛屽湪鍚姩绾跨▼浠ｇ爜涔嬪墠鏈変袱涓牎楠屾潯浠讹細
if (thread != null)
return;
if (backgroundProcessorDelay <= 0)
return;
瀹瑰櫒缁勪欢瀵硅薄鍒濆鍖栨椂thread涓簄ull锛宐ackgroundProcessorDelay鏄?1
/**
* The background thread.
*/
private Thread thread = null;
/**
* The processor delay for this component.
*/
protected int backgroundProcessorDelay = -1;
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public StandardEngine() {
super();
pipeline.setBasic(new StandardEngineValve());
/* Set the jmvRoute using the system property jvmRoute */
try {
setJvmRoute(System.getProperty("jvmRoute"));
} catch(Exception ex) {
log.warn(sm.getString("standardEngine.jvmRouteFail"));
}
// By default, the engine will hold the reloading thread
backgroundProcessorDelay = 10;
}
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thread = new Thread(new ContainerBackgroundProcessor(), threadName);
thread.setDaemon(true);
thread.start();
鎵€浠ヨ繖涓嚎绋嬪皢浼氭墽琛孋ontainerBase鐨勫唴閮ㄧ被ContainerBackgroundProcessor鐨剅un鏂规硶锛岀湅涓婥ontainerBackgroundProcessor鐨勫叏閮ㄥ疄鐜颁唬鐮侊細
/**
* Private thread class to invoke the backgroundProcess method
* of this container and its children after a fixed delay.
*/
protected class ContainerBackgroundProcessor implements Runnable {
@Override
public void run() {
while (!threadDone) {
try {
Thread.sleep(backgroundProcessorDelay * 1000L);
} catch (InterruptedException e) {
// Ignore
}
if (!threadDone) {
Container parent = (Container) getMappingObject();
ClassLoader cl =
Thread.currentThread().getContextClassLoader();
if (parent.getLoader() != null) {
cl = parent.getLoader().getClassLoader();
}
processChildren(parent, cl);
}
}
}
protected void processChildren(Container container, ClassLoader cl) {
try {
if (container.getLoader() != null) {
Thread.currentThread().setContextClassLoader
(container.getLoader().getClassLoader());
}
container.backgroundProcess();
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
log.error("Exception invoking periodic operation: ", t);
} finally {
Thread.currentThread().setContextClassLoader(cl);
}
Container[] children = container.findChildren();
for (int i = 0; i < children.length; i++) {
if (children[i].getBackgroundProcessorDelay() <= 0) {
processChildren(children[i], cl);
}
}
}
}
鍦ㄥ畠鐨剅un鏂规硶鏆傚仠涓€娈垫椂闂翠箣鍚庝細璋冪敤processChildren鏂规硶锛岃€宲rocessChildren鏂规硶鍋氫簡涓や欢浜嬶紝涓€鏄皟鐢ㄥ鍣ㄧ粍浠惰嚜韬殑backgroundProcess鏂规硶锛岃€屾槸鍙栧嚭璇ュ鍣ㄧ粍浠剁殑鎵€鏈夊瓙瀹瑰櫒缁勪欢骞惰皟鐢ㄥ畠浠殑processChildren鏂规硶銆傚綊缁撹捣鏉ヨ繖涓嚎绋嬬殑瀹炵幇灏辨槸瀹氭湡閫氳繃閫掑綊鐨勬柟寮忚皟鐢ㄥ綋鍓嶅鍣ㄥ強鍏舵墍鏈夊瓙瀹瑰櫒鐨刡ackgroundProcess鏂规硶銆?/p>
鑰岃繖涓猙ackgroundProcess鏂规硶鍦–ontainerBase鍐呴儴宸茬粡缁欏嚭浜嗗疄鐜帮細
@Override
public void backgroundProcess() {
if (!getState().isAvailable())
return;
if (cluster != null) {
try {
cluster.backgroundProcess();
} catch (Exception e) {
log.warn(sm.getString("containerBase.backgroundProcess.cluster", cluster), e);
}
}
if (loader != null) {
try {
loader.backgroundProcess();
} catch (Exception e) {
log.warn(sm.getString("containerBase.backgroundProcess.loader", loader), e);
}
}
if (manager != null) {
try {
manager.backgroundProcess();
} catch (Exception e) {
log.warn(sm.getString("containerBase.backgroundProcess.manager", manager), e);
}
}
Realm realm = getRealmInternal();
if (realm != null) {
try {
realm.backgroundProcess();
} catch (Exception e) {
log.warn(sm.getString("containerBase.backgroundProcess.realm", realm), e);
}
}
Valve current = pipeline.getFirst();
while (current != null) {
try {
current.backgroundProcess();
} catch (Exception e) {
log.warn(sm.getString("containerBase.backgroundProcess.valve", current), e);
}
current = current.getNext();
}
fireLifecycleEvent(Lifecycle.PERIODIC_EVENT, null);
}
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涓婇潰灏辨槸Tomcat7鐨勫悗鍙板鐞嗙嚎绋嬫墍浣滅殑浜嬫儏鐨勬杩帮紝鍦═omcat鐨勬棭鏈熺増鏈腑鏈変竴浜涘悗鍙板鐞嗙殑浜嬫儏鍘熸潵鏄湪鍚勪釜缁勪欢鍐呴儴鍒嗗埆鑷畾涔変竴涓嚎绋嬪苟鍚姩锛屽湪Tomcat5涓敼鎴愪簡鎵€鏈夊悗鍙板鐞嗗叡浜悓涓€绾跨▼鐨勬柟寮忋€?/p>
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鍥炲埌鏈枃瑕佽В绛旂殑闂锛寃eb搴旂敤濡備綍鍔犺浇鍒板鍣ㄤ腑鐨勶紵鍦–ontainerBase绫荤殑backgroundProcess鏂规硶鐨勬渶鍚庯細
fireLifecycleEvent(Lifecycle.PERIODIC_EVENT, null);
鍚戝鍣ㄦ敞鍐屼簡涓€涓狿ERIODIC_EVENT浜嬩欢銆傚墠闈㈣閬撻粯璁ょ殑ContainerBackgroundProcessor[StandardEngine[Catalina]]绾跨▼浼氬畾鏈燂紙榛樿涓?0绉掞級鎵цEngine銆丠ost銆丆ontext銆乄rapper鍚勫鍣ㄧ粍浠跺強涓庡畠浠浉鍏崇殑鍏跺畠缁勪欢鐨刡ackgroundProcess鏂规硶锛屾墍浠ヤ篃浼氬畾鏈熷悜Host缁勪欢鍙戝竷涓€涓狿ERIODIC_EVENT浜嬩欢锛岃繖閲岀湅涓婼tandardHost閮戒細鍏宠仈鐨勪竴涓洃鍚櫒org.apache.catalina.startup.HostConfig锛?/p>
鍦═omcat鍚姩瑙ｆ瀽xml鏃秓rg.apache.catalina.startup.Catalina绫荤殑386琛岋細digester.addRuleSet(new HostRuleSet("Server/Service/Engine/"))
鍦℉ostRuleSet绫荤殑addRuleInstances鏂规硶涓細
public void addRuleInstances(Digester digester) {
digester.addObjectCreate(prefix + "Host",
"org.apache.catalina.core.StandardHost",
"className");
digester.addSetProperties(prefix + "Host");
digester.addRule(prefix + "Host",
new CopyParentClassLoaderRule());
digester.addRule(prefix + "Host",
new LifecycleListenerRule
("org.apache.catalina.startup.HostConfig",
"hostConfigClass"));
digester.addSetNext(prefix + "Host",
"addChild",
"org.apache.catalina.Container");
绗?鍒?2琛岀湅鍒帮紝鎵€鏈塇ost鑺傜偣閮戒細娣诲姞涓€涓猳rg.apache.catalina.startup.HostConfig瀵硅薄浣滀负org.apache.catalina.core.StandardHost瀵硅薄鐨勭洃鍚櫒
锛夛紝鍦℉ostConfig鐨刲ifecycleEvent鏂规硶涓彲浠ョ湅鍒板鏋淗ost缁勪欢鏀跺埌浜哃ifecycle.PERIODIC_EVENT浜嬩欢鐨勫彂甯冩墍浣滃嚭鐨勫搷搴旓紙濡傛灉瀵筎omcat7鐨凩ifecycle鏈哄埗涓嶆竻妤氬彲浠ョ湅涓?a href="/blog/1920896" title="Tomcat7鍚姩鍒嗘瀽锛堜簲锛塋ifecycle鏈哄埗鍜屽疄鐜板師鐞? target="_blank">銆奣omcat7鍚姩鍒嗘瀽锛堜簲锛塋ifecycle鏈哄埗鍜屽疄鐜板師鐞嗐€?/a>锛夛細
public void lifecycleEvent(LifecycleEvent event) {
// Identify the host we are associated with
try {
host = (Host) event.getLifecycle();
if (host instanceof StandardHost) {
setCopyXML(((StandardHost) host).isCopyXML());
setDeployXML(((StandardHost) host).isDeployXML());
setUnpackWARs(((StandardHost) host).isUnpackWARs());
}
} catch (ClassCastException e) {
log.error(sm.getString("hostConfig.cce", event.getLifecycle()), e);
return;
}
// Process the event that has occurred
if (event.getType().equals(Lifecycle.PERIODIC_EVENT)) {
check();
} else if (event.getType().equals(Lifecycle.START_EVENT)) {
start();
} else if (event.getType().equals(Lifecycle.STOP_EVENT)) {
stop();
}
}
绗?7琛岋紝濡傛灉鍙戝竷鐨勪簨浠舵槸PERIODIC_EVENT灏嗕細鎵цcheck鏂规硶銆傜19琛岋紝濡傛灉鍙戝竷鐨勪簨浠舵槸START_EVENT鍒欐墽琛宻tart鏂规硶銆俢heck鏂规硶鍜宻tart鏂规硶鏈€鍚庨兘浼氳皟鐢╠eployApps()鏂规硶锛岀湅涓嬭繖鏂规硶鐨勫疄鐜帮細
/**
* Deploy applications for any directories or WAR files that are found
* in our "application root" directory.
*/
protected void deployApps() {
File appBase = appBase();
File configBase = configBase();
String[] filteredAppPaths = filterAppPaths(appBase.list());
// Deploy XML descriptors from configBase
deployDescriptors(configBase, configBase.list());
// Deploy WARs
deployWARs(appBase, filteredAppPaths);
// Deploy expanded folders
deployDirectories(appBase, filteredAppPaths);
}
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鏈枃鍓嶉潰鎻愬埌榛樿鎯呭喌涓嬬粍浠跺惎鍔ㄧ殑鏃跺€欎細鍙戝竷涓€涓狶ifecycle.START_EVENT浜嬩欢锛堝湪org.apache.catalina.core.ContainerBase绫荤殑startInternal鏂规硶鍊掓暟绗簩琛岋級锛屽洖鍒癏ostConfig鐨刲ifecycleEvent鏂规硶涓紝鎵€浠ラ粯璁ゅ惎鍔ㄦ椂灏嗕細鎵цHostConfig鐨剆tart鏂规硶锛屽湪璇ユ柟娉曠殑鏈€鍚庯細
if (host.getDeployOnStartup())
deployApps();
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褰撶劧锛屽鏋滃湪server.xml涓璈ost鑺傜偣鐨刣eployOnStartup灞炴€ц缃负false锛屽垯瀹瑰櫒鍚姩鏃朵笉浼氬姞杞藉簲鐢紝鍚姩瀹屼箣鍚庝笉鑳界珛鍗虫彁渚泈eb搴旂敤鐨勬湇鍔°€備絾鍥犱负鏈変笂闈㈡彁鍒扮殑鍚庡彴澶勭悊绾跨▼鍦ㄨ繍琛岋紝浼氬畾鏈熸墽琛孒ostConfig鐨刢heck鏂规硶锛?/p>
/**
* Check status of all webapps.
*/
protected void check() {
if (host.getAutoDeploy()) {
// Check for resources modification to trigger redeployment
DeployedApplication[] apps =
deployed.values().toArray(new DeployedApplication[0]);
for (int i = 0; i < apps.length; i++) {
if (!isServiced(apps[i].name))
checkResources(apps[i]);
}
// Check for old versions of applications that can now be undeployed
if (host.getUndeployOldVersions()) {
checkUndeploy();
}
// Hotdeploy applications
deployApps();
}
}
濡傛灉Host鑺傜偣鐨刟utoDeploy灞炴€ф槸true锛堥粯璁よ缃嵆涓簍rue锛夛紝鍙互鐪嬪埌check鏂规硶鏈€鍚庡悓鏍蜂細鍔犺浇web搴旂敤銆?/p>