Improvements to HTTP session #353
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lutovich
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HTTP driver uses transactional Cypher endpoint instead of Bolt. It used to simply submit queries via `POST db/data/transaction/commit` in auto-commit mode. This made it impossible to cancel such queries because transaction id was not known. Canceling is needed in `Session#close()` to terminate all ongoing queries and transactions. `Session#close()` is used by neo4j-browser to terminate running queries. This commit makes `Session#close()` terminate all ongoing transactions and thus cancel all running queries. `Session#run()` now does not submit query directly via `POST db/data/transaction/commit`. Instead, it first starts a transaction via `POST db/data/transaction` and gets id of the newly started transaction. Then a query is submitted via `POST db/data/transaction/XXX` where `XXX` is the transaction id. After a successful query, separate commit request is issued via `POST db/data/transaction/XXX/commit`. After a failed query, rollback is issued via `DELETE db/data/transaction/XXX`. Transaction id is thus known during the query execution and can be used by `Session#close()` to rollback the transaction via `DELETE db/data/transaction/XXX`.
This commit makes experimental HTTP driver able to receive spatial 2D and 3D points and return them as `Point` objects in records. Note that no metadata is returned by the REST endpoint for nested points (in lists or maps) so they will not be converted to `Point` objects.
There currently exists no way for the REST endpoint to accept spatial and temporal types as query parameters. This commit makes driver fail fast so that given spatial or temporal objects are not misinterpreted as maps.
All temporal values are exposed as ISO strings, not temporal objects, as with bolt.
This will rollback all open transactions and cancel running queries.
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ali-ince
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Apr 18, 2018
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Session#close()terminates ongoing transactions/queries to align with RESET message in Bolt