40 lines
1.9 KiB
Markdown
40 lines
1.9 KiB
Markdown
# Tasks
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Tasks are stored internally as a key/value map with string keys and values.
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All fields are optional: the `Create` operation creates an empty task.
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Display layers should apply appropriate defaults where necessary.
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## Atomicity
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The synchronization process does not support read-modify-write operations.
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For example, suppose tags are updated by reading a list of tags, adding a tag, and writing the result back.
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This would be captured as an `Update` operation containing the amended list of tags.
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Suppose two such `Update` operations are made in different replicas and must be reconciled:
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* `Update("d394be59-60e6-499e-b7e7-ca0142648409", "tags", "oldtag,newtag1", "2020-11-23T14:21:22Z")`
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* `Update("d394be59-60e6-499e-b7e7-ca0142648409", "tags", "oldtag,newtag2", "2020-11-23T15:08:57Z")`
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The result of this reconciliation will be `oldtag,newtag2`, while the user almost certainly intended `oldtag,newtag1,newtag2`.
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The key names given below avoid this issue, allowing user updates such as adding a tag or deleting a dependency to be represented in a single `Update` operation.
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## Representations
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Integers are stored in decimal notation.
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Timestamps are stored as UNIX epoch timestamps, in the form of an integer.
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## Keys
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The following keys, and key formats, are defined:
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* `status` - one of `P` for a pending task (the default), `C` for completed or `D` for deleted
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* `description` - the one-line summary of the task
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* `modified` - the time of the last modification of this task
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* `start.<timestamp>` - either an empty string (representing work on the task to the task that has not been stopped) or a timestamp (representing the time that work stopped)
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* `tag.<tag>` - indicates this task has tag `<tag>` (value is an empty string)
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The following are not yet implemented:
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* `dep.<uuid>` - indicates this task depends on `<uuid>` (value is an empty string)
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* `annotation.<timestamp>` - value is an annotation created at the given time
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