title | component | reviewed | related | redirects | |||
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Learning Transport |
LearningTransport |
2017-05-01 |
|
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The Learning Transport simulates queuing infrastructure by storing all message actions in the local file system. All files and directories are relative to the current solution directory.
include: learning-warning
Added in Version 6.3.
include: learning-usages
Currently ServiceControl (and hence ServicePulse and ServiceInsight) are not supported.
The learning transport simulates a multicast transport this means that routing configuration isn't needed in order to publish events.
See the native pubsub documentation for further details.
snippet: LearningTransport
The transport supports the following Transport Transaction Modes:
- Sends atomic with Receive (Default)
- Receive Only
- Unreliable (Transactions Disabled)
By default the transport runs with concurrency limited to 1. See the tuning for details on how to configure concurrency levels.
Note: Production transports will run with higher concurrency setting by default
By default all data is stored in a .learningtransport
directory that exists at the solution root.
To configure the storage location:
snippet: StorageDirectory
WARNING: When using source control the storage directory should be excluded and never committed.
To simulate a real transport, the serialized message size supported by the learning transport is limited to 64 kB. To remove this restriction:
snippet: NoPayloadSizeRestriction
Native publish and subscribe is simulated by storing subscriber metadata in a .events
folder in the root storage directory. Subscribers will write their address to a file named {storage directory}\.events\{message type fullname}\{endpointname}.subscription
. Publishers will send copies of each published event to all registered subscribers.
The serialized contents of a message.
- Serialization is done using the configured Serializer.
- File convention is
[MessageId].body.txt
.
A serialized representation of a messages metadata.
- First line is the path to the Message Body File.
- Remaining lines are the json serialized headers of the message.
- File convention is
[MessageId].metadata.txt
.
When a message fails processing both its metadata and body files will be moved to the "error" directory. The name of the directory will be derived from configured error queue address. The default error queue name, and hence directory name, is "error".
Each endpoint will have a corresponding directory under .learningtransport
with the following structure
Each incoming messages will have a corresponding Metadata File at the root of the endpoint directory.
Each incoming messages will have a corresponding Body in this directory.
Used to store messages that have been send with a Delayed Delivery. One directory per time stamp (of a second granularity) with the format yyyyMMddHHmmss
. Each timestamp directory can contain multiple Metadata Files.
Transaction directory used to mark a message as being processed. Also prevents duplicate processing.
Used to temporarily store outgoing message that are sent during the processing of another message.