Class SessionPool (7.5.0)

Class used to manage connections to Spanner.

**You don't need to use this class directly, connections will be handled for you.**

{EventEmitter}

Constructs a new instance of the SessionPool class

Total number of available sessions. {number}

Total number of borrowed sessions. {number}

Flag to determine if Pool is full. {boolean}

Total size of pool. {number}

Number of sessions being created or prepared for a read/write transaction. {number}

Sum of read and write waiters. {number}

Attempts to borrow a session from the pool.

Moves a session into the borrowed group.

Borrows the first session from the inventory.

{Session}

Grabs the next available session.

Attempts to create a single session.

Batch creates sessions.

Attempts to delete a session, optionally creating a new one of the same type if the pool is still open and we're under the configured min value.

SessionPool#error

Deletes idle sessions that exceed the maxIdle configuration.

Fills the pool with the minimum number of sessions.

{Promise}

Retrieves a list of all the idle sessions.

Returns stack traces for sessions that have not been released.

{string[]}

Attempts to get a session.

Returns true if the pool has a usable session.

Checks to see whether or not session is expired.

Pings an individual session.

Makes a keep alive request to all the idle sessions.

Creates a transaction for a session.

Releases a session back into the pool.

SessionPool#available SessionPool#session-available

Starts housekeeping (pinging/evicting) of idle sessions.

Stops housekeeping.

Closes and the pool.

SessionPool#close

Formats stack trace objects into Node-like stack trace.

Retrieve a read session.

Retrieve a session.

Retrieve a read/write session.

Opens the pool, filling it to the configured number of read and write sessions.

SessionPool#open {Promise}

Releases session back into the pool.