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149 changes: 149 additions & 0 deletions
149
obp-api/src/main/scala/bootstrap/liftweb/CustomDBVendor.scala
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,149 @@ | ||
| package bootstrap.liftweb | ||
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| import java.sql.{Connection, DriverManager} | ||
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| import net.liftweb.common.{Box, Failure, Full, Logger} | ||
| import net.liftweb.db.ConnectionManager | ||
| import net.liftweb.util.ConnectionIdentifier | ||
| import net.liftweb.util.Helpers.tryo | ||
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| /** | ||
| * The standard DB vendor. | ||
| * | ||
| * @param driverName the name of the database driver | ||
| * @param dbUrl the URL for the JDBC data connection | ||
| * @param dbUser the optional username | ||
| * @param dbPassword the optional db password | ||
| */ | ||
| class CustomDBVendor(driverName: String, | ||
| dbUrl: String, | ||
| dbUser: Box[String], | ||
| dbPassword: Box[String]) extends CustomProtoDBVendor { | ||
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| private val logger = Logger(classOf[CustomDBVendor]) | ||
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| protected def createOne: Box[Connection] = { | ||
| tryo{t:Throwable => logger.error("Cannot load database driver: %s".format(driverName), t)}{Class.forName(driverName);()} | ||
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| (dbUser, dbPassword) match { | ||
| case (Full(user), Full(pwd)) => | ||
| tryo{t:Throwable => logger.error("Unable to get database connection. url=%s, user=%s".format(dbUrl, user),t)}(DriverManager.getConnection(dbUrl, user, pwd)) | ||
| case _ => | ||
| tryo{t:Throwable => logger.error("Unable to get database connection. url=%s".format(dbUrl),t)}(DriverManager.getConnection(dbUrl)) | ||
| } | ||
| } | ||
| } | ||
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| trait CustomProtoDBVendor extends ConnectionManager { | ||
| private val logger = Logger(classOf[CustomProtoDBVendor]) | ||
| private var pool: List[Connection] = Nil | ||
| private var poolSize = 0 | ||
| private var tempMaxSize = maxPoolSize | ||
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| /** | ||
| * Override and set to false if the maximum pool size can temporarily be expanded to avoid pool starvation | ||
| */ | ||
| protected def allowTemporaryPoolExpansion = true | ||
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| /** | ||
| * Override this method if you want something other than | ||
| * 20 connections in the pool | ||
| */ | ||
| protected def maxPoolSize = 20 | ||
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| /** | ||
| * The absolute maximum that this pool can extend to | ||
| * The default is 40. Override this method to change. | ||
| */ | ||
| protected def doNotExpandBeyond = 30 | ||
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| /** | ||
| * The logic for whether we can expand the pool beyond the current size. By | ||
| * default, the logic tests allowTemporaryPoolExpansion && poolSize <= doNotExpandBeyond | ||
| */ | ||
| protected def canExpand_? : Boolean = allowTemporaryPoolExpansion && poolSize <= doNotExpandBeyond | ||
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| /** | ||
| * How is a connection created? | ||
| */ | ||
| protected def createOne: Box[Connection] | ||
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| /** | ||
| * Test the connection. By default, setAutoCommit(false), | ||
| * but you can do a real query on your RDBMS to see if the connection is alive | ||
| */ | ||
| protected def testConnection(conn: Connection) { | ||
| conn.setAutoCommit(false) | ||
| } | ||
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| def newConnection(name: ConnectionIdentifier): Box[Connection] = | ||
| synchronized { | ||
| pool match { | ||
| case Nil if poolSize < tempMaxSize => | ||
| val ret = createOne | ||
| ret.foreach(_.setAutoCommit(false)) | ||
| poolSize = poolSize + 1 | ||
| logger.debug("Created new pool entry. name=%s, poolSize=%d".format(name, poolSize)) | ||
| ret | ||
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| case Nil => | ||
| val curSize = poolSize | ||
| logger.trace("No connection left in pool, waiting...") | ||
| wait(50L*poolSize ) | ||
| // if we've waited 50 ms and the pool is still empty, temporarily expand it | ||
| if (pool.isEmpty && poolSize == curSize && canExpand_?) { | ||
| tempMaxSize += 1 | ||
| logger.debug("Temporarily expanding pool. name=%s, tempMaxSize=%d".format(name, tempMaxSize)) | ||
| newConnection(name) | ||
| }else{ | ||
| logger.error(s"The poolSize is expanding to tempMaxSize ($tempMaxSize), we can not create new connection, need to restart OBP now.") | ||
| Failure(s"Database may be down, please check database connection! OBP already create $tempMaxSize connections, because all connections are occupied!") | ||
| } | ||
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| case x :: xs => | ||
| logger.trace("Found connection in pool, name=%s".format(name)) | ||
| pool = xs | ||
| try { | ||
| this.testConnection(x) | ||
| Full(x) | ||
| } catch { | ||
| case e: Exception => try { | ||
| logger.debug("Test connection failed, removing connection from pool, name=%s".format(name)) | ||
| poolSize = poolSize - 1 | ||
| tryo(x.close) | ||
| newConnection(name) | ||
| } catch { | ||
| case e: Exception => newConnection(name) | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| def releaseConnection(conn: Connection): Unit = synchronized { | ||
| if (tempMaxSize > maxPoolSize) { | ||
| tryo {conn.close()} | ||
| tempMaxSize -= 1 | ||
| poolSize -= 1 | ||
| } else { | ||
| pool = conn :: pool | ||
| } | ||
| logger.debug("Released connection. poolSize=%d".format(poolSize)) | ||
| notifyAll | ||
| } | ||
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| def closeAllConnections_!(): Unit = _closeAllConnections_!(0) | ||
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| private def _closeAllConnections_!(cnt: Int): Unit = synchronized { | ||
| logger.info("Closing all connections") | ||
| if (poolSize <= 0 || cnt > 10) () | ||
| else { | ||
| pool.foreach {c => tryo(c.close); poolSize -= 1} | ||
| pool = Nil | ||
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| if (poolSize > 0) wait(250) | ||
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| _closeAllConnections_!(cnt + 1) | ||
| } | ||
| } | ||
| } |
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