dd.host.impl
Class HostHbStage

java.lang.Object
  |
  +--ostore.util.StandardStage
        |
        +--dd.host.impl.HostHbStage

All Implemented Interfaces:

EventHandlerIF, SingleThreadedEventHandlerIF

public class HostHbStage

extends StandardStage

implements SingleThreadedEventHandlerIF

HostHbStage handles the logic that modifies the local information stored about a particular host in the system.

Version:

$Id: HostHbStage.java,v 1.10 2004/05/29 08:26:46 hweather Exp $

Author:

Hakim Weatherspoon

See Also:

HostInfo, PtrMgr

Nested Class Summary

static class	HostHbStage.DeadMail DeadMail is mail delivered to every node in the system carrying news that a node recently died.
static class	HostHbStage.HostDbReq HostDbReq/HostHbStage.HostDbResp are used to tranfer the contents of the HostDb from an older leaf set member to a new node.
static class	HostHbStage.HostDbResp HostHbStage.HostDbReq/HostDbResp are used to tranfer the contents of the HostDb from an older leaf set member to a new node.
static class	HostHbStage.HostHb HostHb; that is, we are alive.
static class	HostHbStage.Ping Ping another node to test if the node is alive.
static class	HostHbStage.Pong Pong; that is, let another node know that we are alive.

Field Summary

short	_seq A sequence number to keep track of position of a HostDb transfer.
protected static long	appId Unique identifier for this stage.

Fields inherited from class ostore.util.StandardStage

classifier, DEBUG, event_types, inb_msg_types, logger, my_node_id, my_sink, outb_msg_types, resender, resender_tokens, serializable_types, sim_running, tag

Constructor Summary

HostHbStage()
Constructor: Creates a new HostHbStage stage.

Method Summary

void	dumpRevpointers(Map revs, int level) dumpRevpointers prints the specified level of the reverse pointers to standard error.
void	handleEvent(QueueElementIF item) Specified by seda.sandStorm.api.EventHandlerIF
void	init(ConfigDataIF config) Specified by seda.sandStorm.api.EventHandlerIF

Methods inherited from class ostore.util.StandardStage

BUG, BUG, BUG, destroy, dispatch, enqueue, handleEvents, now_ms, now_us

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

appId

protected static final long appId

Unique identifier for this stage.

_seq

public short _seq

A sequence number to keep track of position of a HostDb transfer.

Constructor Detail

HostHbStage

public HostHbStage()
            throws Exception

Constructor: Creates a new HostHbStage stage.

Method Detail

handleEvent

public void handleEvent(QueueElementIF item)
                 throws EventHandlerException

Specified by seda.sandStorm.api.EventHandlerIF

Specified by:

handleEvent in interface EventHandlerIF

EventHandlerException

init

public void init(ConfigDataIF config)
          throws Exception

Specified by seda.sandStorm.api.EventHandlerIF

Specified by:

init in interface EventHandlerIF

Overrides:

init in class StandardStage

Exception

dumpRevpointers

public void dumpRevpointers(Map revs,
                            int level)

dumpRevpointers prints the specified level of the reverse pointers to standard error.

Parameters:

revs - reverse pointers.

level - Level of reverse pointers.