Monthly Archives: November 2009

Metro Reliable Messaging Configuration Summary

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I finally found time to write up a summary of all features that can be configured in Metro Reliable Messaging. Please check the tables bellow. Enjoy… :-)

RM Configuration Namespace

PrefixNamespace
wsphttp://www.w3.org/ns/ws-policy
wsrmp10http://schemas.xmlsoap.org/ws/2005/02/rm/policy
wsrmphttp://docs.oasis-open.org/ws-rx/wsrmp/200702
net30rmphttp://schemas.microsoft.com/net/2005/02/rm/policy
net35rmphttp://schemas.microsoft.com/ws-rx/wsrmp/200702
sunrmphttp://sun.com/2006/03/rm
sunrmcphttp://sun.com/2006/03/rm/client
metrohttp://java.sun.com/xml/ns/metro/ws-rx/wsrmp/200702
This table contains XML namespaces used in WS-Policy assertions that are used to configure Metro Reliable Messaging

Reliable Messaging Configuration

Feature nameDescriptionWS-RM 1.0 compatible assertionWS-RM 1.1+ compatible assertion
Enable Reliable Messaging + version Specifies that WS-ReliableMessaging protocol MUST be used when sending messages.
Defines also the version of the WS-RM protocol to be used.
/wsrmp10:RMAssertion/wsrmp:RMAssertion
Sequence Inactivity Timeout Specifies the time interval beyond which either RM Source or RM Destination may
terminate the RM sequence due to inactivity. The default setting is 600,000 milliseconds
(10 minutes). A web service endpoint will always terminate session whose inactivity
timeout has expired. Specified in milliseconds.
/wsrmp10:RMAssertion/wsrmp10:InactivityTimeout/net35rmp:InactivityTimeout
Acknowledgement interval Specifies the duration after which the RM Destination will transmit an acknowledgement.
If omitted, there is no implied value. Specified in milliseconds.
/wsrmp10:RMAssertion/wsrmp10:AcknowledgementInterval/net35rmp:AcknowledgementInterval
Retransmission Interval Specifies how long the RM Source will wait after transmitting a message and before
retransmitting the message. If omitted, there is no implied value. Specified in
milliseconds.
 /wsrmp10:RMAssertion/wsrmp10:BaseRetransmissionInterval
/sunrmcp:ResendInterval
/metro:RetransmissionConfig/metro:Interval
Retransmission Interval Adjustment Algorithm Specifies that the retransmission interval will be adjusted using a specific
(e.g. exponential back-off) algorithm.

/wsrmp10:RMAssertion/wsrmp10:ExponentialBackoff

("Exponential backoff" algorithm only)

/metro:RetransmissionConfig/metro:Algorithm
Maximum Retransmission Count


A message is considered to be transferred if its delivery at the recipient
has been acknowledged by the recipient.


If an acknowledgment has not been received within a certain amount of time
for a message that has been transmitted, the infrastructure automatically
retransmits the message. The infrastructure tries to send the message for
at most a preconfigured number of times. Not receiving an acknowledgment
before this limit is reached is considered a fatal communication failure,
and causes the RM session to fail.

N/A/metro:RetransmissionConfig/metro:MaxRetries
Close sequence timeout By default, the call to proxy.close() will not return until all messages have been
acknowledged. RM close timeout is the interval (in milliseconds) that the client
runtime will block waiting for a call to close() to return. If there are still
unacknowledged messages after this interval is reached, and the call to close
has returned, an error will be logged about messages being lost.

/sunrmcp:CloseTimeout

(client side only)

/metro:CloseSequenceTimeout
Acknowledgement request interval Defines the suggested minimum time that the sender (RM Source) should allow to elapse
between sending consecutive Acknowledgement request messages to the RM Destination.
/sunrmcp:AckRequestInterval/metro:AckRequestInterval
Bind RM sequence to security token Defines the requirement that an RM Sequence MUST be bound to an explicit token that is
referenced from a wsse:SecurityTokenReference in the CreateSequence message.
N/A/wsrmp:RMAssertion/wsp:Policy/wsrmp:SequenceSTR
Bind RM sequence to secured transport Defines the requirement that an RM Sequence MUST be bound to the session(s) of the underlying
transport-level protocol used to carry the CreateSequence and CreateSequenceResponse message.
(When present, this assertion MUST be used in conjunction with the sp:TransportBinding assertion.)
N/A/wsrmp:RMAssertion/wsp:Policy/wsrmp:SequenceTransportSecurity
Exactly once delivery Each message is to be delivered exactly once; if a message cannot be delivered then an error
MUST be raised by the RM Source and/or RM Destination. The requirement on an RM Source is that
it SHOULD retry transmission of every message sent by the Application Source until it receives
an acknowledgement from the RM Destination. The requirement on the RM Destination is that it
SHOULD retry the transfer to the Application Destination of any message that it accepts from
the RM Source until that message has been successfully delivered, and that it MUST NOT deliver
a duplicate of a message that has already been delivered.
default/wsrmp:RMAssertion/wsp:Policy/wsrmp:DeliveryAssurance/wsp:Policy/wsrmp:ExactlyOnce
At Most once delivery Each message is to be delivered at most once. The RM Source MAY retry transmission of unacknowledged
messages, but is NOT REQUIRED to do so. The requirement on the RM Destination is that it MUST filter
out duplicate messages, i.e. that it MUST NOT deliver a duplicate of a message that has already been
delivered.
N/A/wsrmp:RMAssertion/wsp:Policy/wsrmp:DeliveryAssurance/wsp:Policy/wsrmp:AtMostOnce
At Least once delivery Each message is to be delivered at least once, or else an error MUST be raised by the RM Source
and/or RM Destination. The requirement on an RM Source is that it SHOULD retry transmission of
every message sent by the Application Source until it receives an acknowledgement from the
RM Destination. The requirement on the RM Destination is that it SHOULD retry the transfer to the
Application Destination of any message that it accepts from the RM Source, until that message
has been successfully delivered. There is no requirement for the RM Destination to apply
duplicate message filtering.
/sunrmcp:AllowDuplicates/wsrmp:RMAssertion/wsp:Policy/wsrmp:DeliveryAssurance/wsp:Policy/wsrmp:AtLeastOnce
InOrder delivery Messages from each individual Sequence are to be delivered in the same order they have been sent
by the Application Source. The requirement on an RM Source is that it MUST ensure that the ordinal
position of each message in the Sequence (as indicated by a message Sequence number) is consistent
with the order in which the messages have been sent from the Application Source. The requirement
on the RM Destination is that it MUST deliver received messages for each Sequence in the order
indicated by the message numbering. This DeliveryAssurance can be used in combination with any
of the AtLeastOnce, AtMostOnce or ExactlyOnce assertions, and the requirements of those assertions
MUST also be met. In particular if the AtLeastOnce or ExactlyOnce assertion applies and the
RM Destination detects a gap in the Sequence then the RM Destination MUST NOT deliver any subsequent
messages from that Sequence until the missing messages are received or until the Sequence is closed.
/sunrmp:Ordered/wsrmp:RMAssertion/wsp:Policy/wsrmp:DeliveryAssurance/wsp:Policy/wsrmp:InOrder
Flow Control Enables or disables the flow control feature. When enabled, this feature works in conjunction with
the Max Buffer Size setting to determine the maximum number of messages for sequence that can be
stored at the endpoint awaiting delivery to the application. Messages may have to be withheld from
the application if ordered delivery is required and some of their predecessors have not arrived. If
the number of stored messages reaches the threshold specified in the Max Buffer Size setting, incoming
messages belonging to the sequence are ignored.
/net30rmp:RmFlowControl/net30rmp:RmFlowControl
Maximum Flow Control Buffer Size If Flow control is enabled, this value specifies the number of request messages that will be
buffered in the RM session. The default setting is 32. For more information, see the description
of the Flow Control option.
/net30rmp:RmFlowControl/net30rmp:MaxReceiveBufferSize/net30rmp:RmFlowControl/net30rmp:MaxReceiveBufferSize
Maximum concurrent RM sessions Specifies how many concurrently active RM sessions (measured based on inbound RM sequences) the SequenceManager
dedicated to the WS Endpoint accepts before starting to refuse new requests for sequence creation.
N/A/metro:MaxConcurrentSessions
Reliable Messaging Persistence Specifies whether the runtime should use persistent sequence and message storage or not.
N/A/metro:Persistent
Sequence manager maintenace task execution period Specifies the period (in milliseconds) of a sequence maintenance task execution. Sequence maintenance
task takes care of terminating inactive sequences and removing the terminated sequences from the
sequence repository.
N/A/metro:MaintenanceTaskPeriod
This table contains summary information about all features that can be configured within Metro Reliable Messaging domain

This information is now available via official Metro User Guide too.