Links Top Level Elements Executors Connectors Containers Nested Components Cluster Elements web.xml Other | Apache Tomcat Configuration ReferenceThe Channel Interceptor object| Introduction |
Apache Tribes supports an interceptor architecture to intercept both messages and membership notifications.
This architecture allows decoupling of logic and opens the way for some very kewl feature add ons.
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| Available Interceptors |
org.apache.catalina.tribes.group.interceptors.TcpFailureDetectororg.apache.catalina.tribes.group.interceptors.ThroughputInterceptororg.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptororg.apache.catalina.tribes.group.interceptors.MessageDispatchInterceptororg.apache.catalina.tribes.group.interceptors.NonBlockingCoordinatororg.apache.catalina.tribes.group.interceptors.OrderInterceptororg.apache.catalina.tribes.group.interceptors.SimpleCoordinatororg.apache.catalina.tribes.group.interceptors.StaticMembershipInterceptororg.apache.catalina.tribes.group.interceptors.TwoPhaseCommitInterceptororg.apache.catalina.tribes.group.interceptors.DomainFilterInterceptororg.apache.catalina.tribes.group.interceptors.FragmentationInterceptororg.apache.catalina.tribes.group.interceptors.GzipInterceptororg.apache.catalina.tribes.group.interceptors.TcpPingInterceptor
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| Static Membership |
In addition to dynamic discovery, Apache Tribes also supports static membership, with membership verification.
To achieve this add the org.apache.catalina.tribes.group.interceptors.StaticMembershipInterceptor
underneath the org.apache.catalina.tribes.group.interceptors.TcpFailureDetector interceptor.
Inside the StaticMembershipInterceptor you can add the static members you wish to have.
The TcpFailureDetector will do a health check on the static members,and also monitor them for crashes
so they will have the same level of notification mechanism as the members that are automatically discovered.
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<Interceptor className="org.apache.catalina.tribes.group.interceptors.StaticMembershipInterceptor">
<Member className="org.apache.catalina.tribes.membership.StaticMember"
port="5678"
securePort="-1"
host="tomcat01.mydomain.com"
domain="staging-cluster"
uniqueId="{0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}"/>
</Interceptor>
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| Attributes |
| Common Attributes |
| Attribute | Description |
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className |
Required, as there is no default
| optionFlag |
If you want the interceptor to trigger on certain message depending on the message's option flag,
you can setup the interceptors flag here.
The default value is 0, meaning this interceptor will trigger on all messages.
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| org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor Attributes |
| Attribute | Description |
|---|
className |
Required, This dispatcher uses JDK 1.5 java.util.concurrent package
| optionFlag |
The default and hard coded value is 8 (org.apache.catalina.tribes.Channel.SEND_OPTIONS_ASYNCHRONOUS).
The dispatcher will trigger on this value only, as it is predefined by Tribes.
The other attributes are inherited from its base class org.apache.catalina.tribes.group.interceptors.MessageDispatchInterceptor.
| maxThreads |
The maximum number of threads in this pool, default is 10.
| maxSpareThreads |
The number of threads to keep in the pool, default is 2.
| keepAliveTime |
Maximum number of milliseconds of until Idle thread terminates. Default value is 5000(5 seconds).
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| org.apache.catalina.tribes.group.interceptors.MessageDispatchInterceptor Attributes |
| Attribute | Description |
|---|
className |
Required, Same implementation as MessageDispatch15Interceptor, but with JDK 1.4 compliance.
| optionFlag |
The default and hard coded value is 8 (org.apache.catalina.tribes.Channel.SEND_OPTIONS_ASYNCHRONOUS).
The dispatcher will trigger on this value only, as it is predefined by Tribes.
| alwaysSend |
What behavior should be executed when the dispatch queue is full. If true (default), then the message is
is sent synchronously, if false an error is thrown.
| maxQueueSize |
Size in bytes of the dispatch queue, the default value is 1024*1024*64 (64MB) sets the maximum queue size for the dispatch queue
if the queue fills up, one can trigger the behavior, if alwaysSend is set to true, the message will be sent synchronously
if the flag is false, an error is thrown
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| org.apache.catalina.tribes.group.interceptors.TcpFailureDetector Attributes |
| Attribute | Description |
|---|
connectTimeout |
Specifies the timeout, in milliseconds, to use when attempting a TCP connection
to the suspect node. Default is 1000.
| performSendTest |
If true is set, send a test message to the suspect node. Default is true.
| performReadTest |
If true is set, read the response of the test message that sent. Default is false.
Note: if performSendTest is false, this attribute will have no effect.
| readTestTimeout |
Specifies the timeout, in milliseconds, to use when performing a read test
to the suspicious node. Default is 5000.
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| org.apache.catalina.tribes.group.interceptors.TcpPingInterceptor Attributes |
| Attribute | Description |
|---|
interval |
If useThread == true, defines the interval of sending a ping message.
default is 1000 ms.
| useThread |
Flag of whether to start a thread for sending a ping message.
If set to true, this interceptor will start a local thread for sending a ping message.
if set to false, channel heartbeat will send a ping message.
default is false.
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| Nested element StaticMember Attributes |
| Attribute | Description |
|---|
className |
Only one implementation available:org.apache.catalina.tribes.membership.StaticMember
| port |
The port that this static member listens to for cluster messages
| securePort |
The secure port this static member listens to for encrypted cluster messages
default value is -1, this value means the member is not listening on a secure port
| host |
The host (or network interface) that this static member listens for cluster messages.
Three different type of values are possible:
1. IP address in the form of "216.123.1.23"
2. Hostnames like "tomcat01.mydomain.com" or "tomcat01" as long as they resolve correctly
3. byte array in string form, for example {216,123,12,3}
| domain |
The logical cluster domain for this this static member listens for cluster messages.
Two different type of values are possible:
1. Regular string values like "staging-domain" or "tomcat-cluster" will be converted into bytes
using ISO-8859-1 encoding.
2. byte array in string form, for example {216,123,12,3}
| uniqueId |
A universally uniqueId for this static member.
The values must be 16 bytes in the following form:
1. byte array in string form, for example {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}
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