ChannelInterceptorBase (Apache Tomcat 7.0.109 API Documentation)

java.lang.Object
- org.apache.catalina.tribes.group.ChannelInterceptorBase

All Implemented Interfaces:

ChannelInterceptor, Heartbeat, MembershipListener

Direct Known Subclasses:

ChannelCoordinator, DomainFilterInterceptor, EncryptInterceptor, FragmentationInterceptor, GroupChannel, GzipInterceptor, MessageDispatchInterceptor, NonBlockingCoordinator, OrderInterceptor, SimpleCoordinator, StaticMembershipInterceptor, TcpFailureDetector, TcpPingInterceptor, ThroughputInterceptor, TwoPhaseCommitInterceptor
```
public abstract class ChannelInterceptorBase
extends Object
implements ChannelInterceptor
```
Abstract class for the interceptor base class.

Author:

Filip Hanik

Nested Class Summary
- Nested classes/interfaces inherited from interface org.apache.catalina.tribes.ChannelInterceptor
  ChannelInterceptor.InterceptorEvent

Field Summary

Fields
Modifier and Type Field and Description

protected int optionFlag

Fields
Modifier and Type	Field and Description
`protected int`	`optionFlag`

Constructor Summary

Constructors
Constructor and Description

ChannelInterceptorBase()

Constructors
Constructor and Description
`ChannelInterceptorBase()`

Method Summary

Methods
Modifier and Type	Method and Description
`boolean`	`accept(ChannelMessage msg)`
`void`	`fireInterceptorEvent(ChannelInterceptor.InterceptorEvent event)`
`Channel`	`getChannel()` Return the channel that is related to this interceptor
`Member`	`getLocalMember(boolean incAlive)` Return the member that represents this node.
`Member`	`getMember(Member mbr)` Intercepts the `Channel.getMember(Member)` method
`Member[]`	`getMembers()` Get all current cluster members
`ChannelInterceptor`	`getNext()` Retrieve the next interceptor in the list
`int`	`getOptionFlag()` An interceptor can react to a message based on a set bit on the message options.
`ChannelInterceptor`	`getPrevious()` Retrieve the previous interceptor in the list
`boolean`	`hasMembers()` has members
`void`	`heartbeat()` The `heartbeat()` method gets invoked periodically to allow interceptors to clean up resources, time out object and perform actions that are unrelated to sending/receiving data.
`void`	`memberAdded(Member member)` A member was added to the group
`void`	`memberDisappeared(Member member)` A member was removed from the group If the member left voluntarily, the Member.getCommand will contain the Member.SHUTDOWN_PAYLOAD data
`void`	`messageReceived(ChannelMessage msg)` the `messageReceived` is invoked when a message is received.
`boolean`	`okToProcess(int messageFlags)`
`void`	`sendMessage(Member[] destination, ChannelMessage msg, InterceptorPayload payload)` The `sendMessage` method is called when a message is being sent to one more destinations.
`void`	`setChannel(Channel channel)` Set the channel that is related to this interceptor
`void`	`setNext(ChannelInterceptor next)` Set the next interceptor in the list of interceptors
`void`	`setOptionFlag(int optionFlag)` Sets the option flag
`void`	`setPrevious(ChannelInterceptor previous)` Set the previous interceptor in the list
`void`	`start(int svc)` Starts up the channel.
`void`	`stop(int svc)` Shuts down the channel.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - optionFlag
```
protected int optionFlag
```
- Constructor Detail
  - ChannelInterceptorBase
```
public ChannelInterceptorBase()
```
- Method Detail
  - okToProcess
```
public boolean okToProcess(int messageFlags)
```
  - setNext
```
public final void setNext(ChannelInterceptor next)
```
    Description copied from interface: ChannelInterceptor
    
    Set the next interceptor in the list of interceptors
    
    Specified by:
    
    setNext in interface ChannelInterceptor
    
    Parameters:
    next - ChannelInterceptor
  - getNext
```
public final ChannelInterceptor getNext()
```
    Description copied from interface: ChannelInterceptor
    
    Retrieve the next interceptor in the list
    
    Specified by:
    
    getNext in interface ChannelInterceptor
    
    Returns:
    ChannelInterceptor - returns the next interceptor in the list or null if no more interceptors exist
  - setPrevious
```
public final void setPrevious(ChannelInterceptor previous)
```
    Description copied from interface: ChannelInterceptor
    
    Set the previous interceptor in the list
    
    Specified by:
    
    setPrevious in interface ChannelInterceptor
    
    Parameters:
    previous - ChannelInterceptor
  - setOptionFlag
```
public void setOptionFlag(int optionFlag)
```
    Description copied from interface: ChannelInterceptor
    
    Sets the option flag
    
    Specified by:
    
    setOptionFlag in interface ChannelInterceptor
    
    Parameters:
    optionFlag - int
    See Also:
    ChannelInterceptor.getOptionFlag()
  - getPrevious
```
public final ChannelInterceptor getPrevious()
```
    Description copied from interface: ChannelInterceptor
    
    Retrieve the previous interceptor in the list
    
    Specified by:
    
    getPrevious in interface ChannelInterceptor
    
    Returns:
    ChannelInterceptor - returns the previous interceptor in the list or null if no more interceptors exist
  - getOptionFlag
```
public int getOptionFlag()
```
    Description copied from interface: ChannelInterceptor
    
    An interceptor can react to a message based on a set bit on the message options.
    When a message is sent, the options can be retrieved from ChannelMessage.getOptions() and if the bit is set, this interceptor will react to it.
    A simple evaluation if an interceptor should react to the message would be:
    boolean react = (getOptionFlag() == (getOptionFlag() & ChannelMessage.getOptions()));
    The default option is 0, meaning there is no way for the application to trigger the interceptor. The interceptor itself will decide.
    
    Specified by:
    
    getOptionFlag in interface ChannelInterceptor
    
    Returns:
    int
    See Also:
    ChannelMessage.getOptions()
  - sendMessage
```
public void sendMessage(Member[] destination,
               ChannelMessage msg,
               InterceptorPayload payload)
                 throws ChannelException
```
    Description copied from interface: ChannelInterceptor
    
    The sendMessage method is called when a message is being sent to one more destinations. The interceptor can modify any of the parameters and then pass on the message down the stack by invoking getNext().sendMessage(destination,msg,payload)
    Alternatively the interceptor can stop the message from being sent by not invoking getNext().sendMessage(destination,msg,payload)
    If the message is to be sent asynchronous the application can be notified of completion and errors by passing in an error handler attached to a payload object.
    The ChannelMessage.getAddress contains Channel.getLocalMember, and can be overwritten to simulate a message sent from another node.
    
    Specified by:
    
    sendMessage in interface ChannelInterceptor
    
    Parameters:
    destination - Member[] - the destination for this message
    msg - ChannelMessage - the message to be sent
    payload - InterceptorPayload - the payload, carrying an error handler and future useful data, can be null
    
    Throws:
    
    ChannelException - if a serialization error happens.
    See Also:
    ErrorHandler, InterceptorPayload
  - messageReceived
```
public void messageReceived(ChannelMessage msg)
```
    Description copied from interface: ChannelInterceptor
    
    the messageReceived is invoked when a message is received. ChannelMessage.getAddress() is the sender, or the reply-to address if it has been overwritten.
    
    Specified by:
    
    messageReceived in interface ChannelInterceptor
    
    Parameters:
    msg - ChannelMessage
  - accept
```
public boolean accept(ChannelMessage msg)
```
  - memberAdded
```
public void memberAdded(Member member)
```
    Description copied from interface: MembershipListener
    
    A member was added to the group
    
    Specified by:
    
    memberAdded in interface MembershipListener
    
    Parameters:
    member - Member - the member that was added
  - memberDisappeared
```
public void memberDisappeared(Member member)
```
    Description copied from interface: MembershipListener
    
    A member was removed from the group
    If the member left voluntarily, the Member.getCommand will contain the Member.SHUTDOWN_PAYLOAD data
    
    Specified by:
    
    memberDisappeared in interface MembershipListener
    
    Parameters:
    member - Member
    See Also:
    Member.SHUTDOWN_PAYLOAD
  - heartbeat
```
public void heartbeat()
```
    Description copied from interface: ChannelInterceptor
    
    The heartbeat() method gets invoked periodically to allow interceptors to clean up resources, time out object and perform actions that are unrelated to sending/receiving data.
    
    Specified by:
    
    heartbeat in interface ChannelInterceptor
    
    Specified by:
    
    heartbeat in interface Heartbeat
  - hasMembers
```
public boolean hasMembers()
```
    has members
    
    Specified by:
    
    hasMembers in interface ChannelInterceptor
    
    Returns:
    boolean - if the channel has members in its membership group
    See Also:
    Channel.hasMembers()
  - getMembers
```
public Member[] getMembers()
```
    Get all current cluster members
    
    Specified by:
    
    getMembers in interface ChannelInterceptor
    
    Returns:
    all members or empty array
    See Also:
    Channel.getMembers()
  - getMember
```
public Member getMember(Member mbr)
```
    Description copied from interface: ChannelInterceptor
    
    Intercepts the Channel.getMember(Member) method
    
    Specified by:
    
    getMember in interface ChannelInterceptor
    
    Parameters:
    mbr - Member
    
    Returns:
    Member
    See Also:
    Channel.getMember(Member)
  - getLocalMember
```
public Member getLocalMember(boolean incAlive)
```
    Return the member that represents this node.
    
    Specified by:
    
    getLocalMember in interface ChannelInterceptor
    
    Parameters:
    incAlive - boolean
    
    Returns:
    Member
    See Also:
    Channel.getLocalMember(boolean)
  - start
```
public void start(int svc)
           throws ChannelException
```
    Starts up the channel. This can be called multiple times for individual services to start The svc parameter can be the logical or value of any constants
    
    Specified by:
    
    start in interface ChannelInterceptor
    
    Parameters:
    svc - int value of
    DEFAULT - will start all services
    MBR_RX_SEQ - starts the membership receiver
    MBR_TX_SEQ - starts the membership broadcaster
    SND_TX_SEQ - starts the replication transmitter
    SND_RX_SEQ - starts the replication receiver
    
    Throws:
    
    ChannelException - if a startup error occurs or the service is already started.
    See Also:
    Channel
  - stop
```
public void stop(int svc)
          throws ChannelException
```
    Shuts down the channel. This can be called multiple times for individual services to shutdown The svc parameter can be the logical or value of any constants
    
    Specified by:
    
    stop in interface ChannelInterceptor
    
    Parameters:
    svc - int value of
    DEFAULT - will shutdown all services
    MBR_RX_SEQ - stops the membership receiver
    MBR_TX_SEQ - stops the membership broadcaster
    SND_TX_SEQ - stops the replication transmitter
    SND_RX_SEQ - stops the replication receiver
    
    Throws:
    
    ChannelException - if a startup error occurs or the service is already started.
    See Also:
    Channel
  - fireInterceptorEvent
```
public void fireInterceptorEvent(ChannelInterceptor.InterceptorEvent event)
```
    Specified by:
    
    fireInterceptorEvent in interface ChannelInterceptor
  - getChannel
```
public Channel getChannel()
```
    Return the channel that is related to this interceptor
    
    Returns:
    Channel
  - setChannel
```
public void setChannel(Channel channel)
```
    Set the channel that is related to this interceptor
    
    Parameters:
    channel -

Class ChannelInterceptorBase

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.catalina.tribes.ChannelInterceptor

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

optionFlag

Constructor Detail

ChannelInterceptorBase

Method Detail

okToProcess

setNext

getNext

setPrevious

setOptionFlag

getPrevious

getOptionFlag

sendMessage

messageReceived

accept

memberAdded

memberDisappeared

heartbeat

hasMembers

getMembers

getMember

getLocalMember

start

stop

fireInterceptorEvent

getChannel

setChannel