doobie.contrib.h2.H2Transactor.scala Maven / Gradle / Ivy

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H2 support for doobie.

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package doobie.contrib.h2

import doobie.imports._

import org.h2.jdbcx.JdbcConnectionPool

import scalaz.{ Catchable, Monad }
import scalaz.syntax.id._
import scalaz.syntax.monad._

/** Module for a `Transactor` backed by an H2 `JdbcConnectionPool`. */
object h2transactor {

  /** A `Transactor` backed by an H2 `JdbcConnectionPool`. */
  final class H2Transactor[M[_]: Monad : Catchable : Capture] private (ds: JdbcConnectionPool) extends Transactor[M] {
    
    protected val connect = Capture[M].apply(ds.getConnection)

    /** A program that shuts down this `H2Transactor`. */
    val dispose: M[Unit] = Capture[M].apply(ds.dispose)

    /** Returns the number of active (open) connections of the underlying `JdbcConnectionPool`. */
    val getActiveConnections: M[Int] = Capture[M].apply(ds.getActiveConnections)

    /** Gets the maximum time in seconds to wait for a free connection. */
    val getLoginTimeout: M[Int] = Capture[M].apply(ds.getLoginTimeout)

    /** Gets the maximum number of connections to use. */
    val getMaxConnections: M[Int] = Capture[M].apply(ds.getMaxConnections)

    /** Sets the maximum time in seconds to wait for a free connection. */
    def setLoginTimeout(seconds: Int): M[Unit] = Capture[M].apply(ds.setLoginTimeout(seconds))

    /** Sets the maximum number of connections to use from now on. */
    def setMaxConnections(max: Int): M[Unit] = Capture[M].apply(ds.setMaxConnections(max))

  }

  object H2Transactor {
    
    /** Constructs a program that yields a `H2Transactor` configured with the given info. */
    def apply[M[_]: Monad : Catchable : Capture](url: String, user: String, pass: String): M[H2Transactor[M]] =
      Capture[M].apply(new H2Transactor(JdbcConnectionPool.create(url, user, pass)))

  }

}