jgroup.relacs.mss
Interface MssConstants

All Known Implementing Classes:

Daemon, FragmentHeader, MsgFactory, MsgJG, MsgMcast, MsgRouting, Mss, MssHost, RoutingTable

public interface MssConstants

The MssConstants interface declares a number of constants mainly relevant for the mss level.

Since:

Jgroup 1.2

Author:

Hein Meling, Alberto Montresor, Salvatore Cammarata

Field Summary

static int	ALL Constant used to indicate that all members of a cluster should receive a message.
static int	EHANDLER_PRIORITY
static int	HEADER_SIZE Header size for network level packets (fragments).
static int	MINIMUM_ALIVE_VALUE If the alive counter of a host is greater or equal to this value, the host is considered to be alive.
static int	MSS_HEADER_SIZE Header size for mss level Jgroup (MsgJG) messages.
static int	MSSUSER_PRIORITY
static boolean	NACKSUPPRESSION Enabling (setting it to true) NACK suppression sends only a single NACK for each cluster.
static int	NI_PRIORITY
static int	OVERHEAD_SIZE The overall overhead for each packet sent to the network.
static boolean	ROUTING_ENABLED Setting this to true enables routing of messages through intermediate clusters, if a node (or cluster) is not directly connected to the destination cluster.
static int	TRAILER_SIZE There is currently no trailer added for each of the mss level packets.
static int	UNDEF Used to indicate that an int value is undefined.
static int	UNREACHABLE If the alive counter of a host is equal to this value, the host is considered to be unreachable.

Field Detail

NACKSUPPRESSION

static final boolean NACKSUPPRESSION

Enabling (setting it to true) NACK suppression sends only a single NACK for each cluster. Otherwise cluster.size messages will be sent for each missing message, for each of the clusters that are missing the message.

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Constant Field Values

ROUTING_ENABLED

static final boolean ROUTING_ENABLED

Setting this to true enables routing of messages through intermediate clusters, if a node (or cluster) is not directly connected to the destination cluster. FIXME NOTE: There is currently a problem with the routing mechanism, so don't turn it on.

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Constant Field Values

MSSUSER_PRIORITY

static final int MSSUSER_PRIORITY

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EHANDLER_PRIORITY

static final int EHANDLER_PRIORITY

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NI_PRIORITY

static final int NI_PRIORITY

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UNREACHABLE

static final int UNREACHABLE

If the alive counter of a host is equal to this value, the host is considered to be unreachable.

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MINIMUM_ALIVE_VALUE

static final int MINIMUM_ALIVE_VALUE

If the alive counter of a host is greater or equal to this value, the host is considered to be alive.

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Constant Field Values

ALL

static final int ALL

Constant used to indicate that all members of a cluster should receive a message.

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UNDEF

static final int UNDEF

Used to indicate that an int value is undefined.

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MSS_HEADER_SIZE

static final int MSS_HEADER_SIZE

Header size for mss level Jgroup (MsgJG) messages. Mss messages contains a static header and a dynamic trailer of unspecified size, whose size is determined at runtime. The content of the header includes a message tag, message identifer, pointer to the trailer's position in the message stream etc. The content of the trailer cannot be accessed until all message fragments (packets) have been received.

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Constant Field Values

HEADER_SIZE

static final int HEADER_SIZE

Header size for network level packets (fragments). Messages sent from the mss level may be split into several smaller fragments (or packets). Each of these fragments will be attached a header of the size given below. This fragment header comes in addition to the payload limit specified in the config.xml file. The header contains information about the message type, broadcast, fragment identifier (fid), sender and incarnation identifier.

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TRAILER_SIZE

static final int TRAILER_SIZE

There is currently no trailer added for each of the mss level packets.

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OVERHEAD_SIZE

static final int OVERHEAD_SIZE

The overall overhead for each packet sent to the network.

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Constant Field Values