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https://issues.apache.org/jira/browse/AVRO-285?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Doug Cutting updated AVRO-285:
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Attachment: AVRO-285.patch
Here's the first version of a patch that adds one-way message support to Java.
The JSON syntax is that, instead of a response type and an error list, a one
way message specifies '"one-way" true'. When this is specified, no response or
error are transmitted, although a handshake response still may be, depending on
the transport and its connection status. This is an incompatible extension to
protocols: if a client or server adds a one-way message then existing
implementations may fail to parse the remote protocol even if the one-way
message is never called.
With the HTTP transport, a handshake response is still always sent, as before,
so existing protocols work identically with existing implementations.
The previously non-standard socket transport is altered so that a handshake is
now only sent with requests until a successful handshake response is received.
Thereafter, as long as the connection remains open, requests and responses
contain no handshakes. Thus, for one-way messages, no response data at all is
transmitted once a connection is established.
The socket transport and one-way messages will be used to implement AVRO-512,
so the socket protocol must be now standardized and documented in the spec.
To do:
- add more unit tests
- document this in the spec, including the socket transport
- perhaps move the handshake test message from the Simple protocol to a new
protocol, so this change does not break other languages.
> request-only messages
> ---------------------
>
> Key: AVRO-285
> URL: https://issues.apache.org/jira/browse/AVRO-285
> Project: Avro
> Issue Type: New Feature
> Components: spec
> Reporter: Doug Cutting
> Attachments: AVRO-285.patch
>
>
> It might be useful to have a standard mechanism in Avro for transmitting
> messages that receive no response, not even an acknowledgement.
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