96 lines
2.5 KiB
Plaintext
96 lines
2.5 KiB
Plaintext
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head 1.4;
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access;
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symbols;
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locks; strict;
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comment @# @;
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1.4
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date 2007.01.09.00.00.00; author MoinMoin; state Exp;
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branches;
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next 1.3;
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1.3
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date 2007.01.09.00.00.00; author MoinMoin; state Exp;
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branches;
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next 1.2;
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1.2
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date 2007.01.09.00.00.00; author MoinMoin; state Exp;
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branches;
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next 1.1;
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1.1
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date 2007.01.09.00.00.00; author MoinMoin; state Exp;
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branches;
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next ;
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desc
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@Initial revision
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@
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1.4
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log
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@Revision 4
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@
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text
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@---+ MessageBrokerService
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A MessageBrokerService is a service distributing messages to other services and pooling their responses. It has a single AccessPoint. A MessageBroker will be used for portals but can also be used in a cascading way to create local networks, e. g. for special interest groups. In this way it serves as a gateway to a complete network of distributed services with (potentially) its own registry of services.
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Making the protocol compliant with MessageBrokers would not be a trivial task,
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and probably other more generic protocols would better support query
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distribution. Such protocols could already exist, but we have not
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investigated with more details.
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Therefore we do not specify a complete protocol for brokers now, but we think they are the generalized form of a ProviderService for which a protocol is being specified.
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---+++++ Suggestions for a Broker Service Protocol
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Based on the ProviderService protocol there are some additional complications:
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* Brokers can be cascading, therefore ...
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* how to adress destinations in the header? Do we need to be able to pass on a message to only a subset of other services somewhere down the line/tree of services?
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* how to avoid vicious circles MessageBrokerService loops in the forwarding of messages?
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---+++++ Current Protocols
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Although the DiGIR protocol has some elements
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especifically related to that service (e.g. "responseWrapper" element
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and multiple destinations), it is not validating all messages
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exchanged between clients and the "portal" engine, and it seems the
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protocol is not officialy supposed to cover these types of messages.
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BioCASE on its turn uses a java API for that purpose.
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@
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1.3
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log
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@Revision 3
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@
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text
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@d5 6
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a10 1
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We do not specify a complete protocol for brokers now, but we think they are the generalized form of a ProviderService for which a protocol is being specified.
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d18 8
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@
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1.2
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log
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@Revision 2
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@
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text
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@a10 1
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* broker responses contain lists of responses from datasources or other brokers
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@
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1.1
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log
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@Initial revision
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@
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text
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@d13 1
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@
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