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qbits.alia.component

Alia module bringing component and spec support. As a consumer, a CassandraRegistry record is provided.

CassandraRegistry instances are responsible for maintaining sessions to clusters.

Downstream consumers of this component can then provide a map of query functions and obtain a function which performs queries against the correct cluster and optional default query options.

See query-functions for details on how to use it.

Alia module bringing component and spec support.
As a consumer, a CassandraRegistry record is provided.

CassandraRegistry instances are responsible for maintaining
sessions to clusters.

Downstream consumers of this component can then provide
a map of query functions and obtain a function which
performs queries against the correct cluster and optional
default query options.

See `query-functions` for details on how to use it.
raw docstring

->optsclj

(->opts nick config code-opts)

This should provide a solid way to parameterize interaction with Cassandra. For each named query nick we determine what options to give to the query in the following way:

  • We fetch defaults from the configuration provided query options
  • We merge code-local defaults for this query
  • We merge query-specific defaults from configuration
This should provide a solid way to parameterize interaction with
Cassandra. For each named query `nick` we determine what options to
give to the query in the following way:

- We fetch defaults from the configuration provided query options
- We merge code-local defaults for this query
- We merge query-specific defaults from configuration
raw docstring

->queryclj

(->query nick session query-opts {:keys [statement opts]})

Get a function which executes a query, preparing the statement.

Get a function which executes a query, preparing the statement.
raw docstring

cassandra-registryclj

(cassandra-registry cluster-opts query-opts config)

A single cluster version of CassandraMultiClusterRegistry

A single cluster version of CassandraMultiClusterRegistry
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cluster-query-optsclj

(cluster-query-opts registry cluster-name)

Fetch query-options from configuration.

Fetch query-options from configuration.
raw docstring

keyspace-sessionclj

(keyspace-session registry k keyspace)

Retrieve a Session instance set to use a specific keyspace. keyspace may be a keyword or string.

Retrieve a `Session` instance set to use a specific keyspace.
keyspace may be a keyword or string.
raw docstring

query!clj

(query! {:keys [query-fn]} & args)

Convenience function against a QueryRegistry to execute a named query. See query-functions for the behavior of the query function

Convenience function against a QueryRegistry to execute a named query.
See `query-functions` for the behavior of the query function
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query-fn-mapclj

(query-fn-map session queries query-opts)

Yield a map of query nickname to function executing the query. Provided queries should be statements valid for alia/prepare.

Yield a map of query nickname to function executing the query.
Provided queries should be statements valid for `alia/prepare`.
raw docstring

query-functionsclj

(query-functions registry keyspace queries)
(query-functions registry cluster-name keyspace queries)

Given a cluster, keyspace, and query map, yield a function which executes queries by nickname. If no cluster-name is provided, assume a single-cluster registry and fetch the first from the registry.

The query function has three arities: 1, 2, and 3. The first argument is always the nickname, the optional second one is a vector of values to attach to the prepared query, the last one additional options to override when sending the query.

Here, options accept an addition :execute-fn key which determine which function should be used to send the query out, defaulting to alia/execute.

Each query can be configured with global configuration defaults, code-supplied defaults, and query-specific configuration overrides, processed in that order as documented in query.

Given a cluster, keyspace, and query map, yield a function
which executes queries by nickname. If no cluster-name
is provided, assume a single-cluster registry and fetch
the first from the registry.

The query function has three arities: 1, 2, and 3.
The first argument is always the nickname, the optional
second one is a vector of values to attach to the prepared
query, the last one additional options to override when
sending the query.

Here, options accept an addition `:execute-fn` key which
determine which function should be used to send the
query out, defaulting to `alia/execute`.

Each query can be configured with global configuration defaults,
code-supplied defaults, and query-specific configuration overrides,
processed in that order as documented in `query`.
raw docstring

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