1. server的實(shí)例類(lèi)為：org.apache.catalina.core.StandardServer為頂層容器。

2.二級(jí)容器GlobalNamingResources，設(shè)置認(rèn)證用戶信息。

? <GlobalNamingResources>

??? <!-- Editable user database that can also be used by

???????? UserDatabaseRealm to authenticate users

??? -->

??? <Resource name="UserDatabase" auth="Container"

????????????? type="org.apache.catalina.UserDatabase"

????????????? description="User database that can be updated and saved"

????????????? factory="org.apache.catalina.users.MemoryUserDatabaseFactory"

????????????? pathname="conf/tomcat-users.xml" />

? </GlobalNamingResources>

3. 二級(jí)容器service，包括了多個(gè)connector和一個(gè)engine

? <!-- A "Service" is a collection of one or more "Connectors" that share

?????? a single "Container" Note:? A "Service" is not itself a "Container",

?????? so you may not define subcomponents such as "Valves" at this level.

?????? Documentation at /docs/config/service.html

?? -->

? <Service name="Catalina">
??? <Connector port="8080" protocol="HTTP/1.1"
?????????????? connectionTimeout="20000"
?????????????? redirectPort="8443" />
??? <!-- Define an AJP 1.3 Connector on port 8009 -->
??? <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />
??? <Engine name="Catalina" defaultHost="localhost" jvmRoute="jvm1">
??? -->
??? <Engine name="Catalina" defaultHost="localhost">

3. 三級(jí)容器Engine包括Realm和Host。

??? <Engine name="Catalina" defaultHost="localhost">

?

????? <!--For clustering, please take a look at documentation at:

????????? /docs/cluster-howto.html? (simple how to)

????????? /docs/config/cluster.html (reference documentation) -->

????? <!--

????? <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>

????? -->

?

?? ???<!-- Use the LockOutRealm to prevent attempts to guess user passwords

?????????? via a brute-force attack -->

????? <Realm className="org.apache.catalina.realm.LockOutRealm">

??????? <!-- This Realm uses the UserDatabase configured in the global JNDI

? ???????????resources under the key "UserDatabase".? Any edits

???????????? that are performed against this UserDatabase are immediately

???????????? available for use by the Realm.? -->

??????? <Realm className="org.apache.catalina.realm.UserDatabaseRealm"

?????????????? resourceName="UserDatabase"/>

????? </Realm>

?

????? <Host name="localhost"? appBase="webapps"

??????????? unpackWARs="true" autoDeploy="true">

?

??????? <!-- SingleSignOn valve, share authentication between web applications

???????????? Documentation at: /docs/config/valve.html -->

??????? <!--

??????? <Valve className="org.apache.catalina.authenticator.SingleSignOn" />

??????? -->

?

??????? <!-- Access log processes all example.

???????????? Documentation at: /docs/config/valve.html

???????????? Note: The pattern used is equivalent to using pattern="common" -->

??????? <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"

?????????????? prefix="localhost_access_log." suffix=".txt"

?????????????? pattern="%h %l %u %t &quot;%r&quot; %s %b" />

?

????? </Host>

??? </Engine>

實(shí)現(xiàn)類(lèi)關(guān)系

Event-Listerner事件監(jiān)聽(tīng)模式

事件監(jiān)聽(tīng)同步模式分兩個(gè)部分：Event Source和Event Listener：
Event Source：被監(jiān)聽(tīng)者的事件集合，可能是方法，提供事件的注冊(cè)加入和移除功能。類(lèi)似被觀察者的集合。
Event Listener：事件的監(jiān)聽(tīng)者，當(dāng)事件被觸發(fā)，所有監(jiān)聽(tīng)這個(gè)事件的監(jiān)聽(tīng)者將被通知，然后執(zhí)行自己的Action響應(yīng)動(dòng)作。

事件監(jiān)聽(tīng)異步模式在Source和Listener之間引入event queue，
event queue是一個(gè)基于事件的publish-subscribe. 它一種松耦合方式提供不同模塊和角色之間異步通訊。它比同步更加松耦合，這樣，我們就把Source-Listener改成了publish-queue-subscribe方式。

?

tomcat server容器解讀