add connection pool to Database object

src/main/scala/servlet/AutoUpdateListener.scala

@@ -10,7 +10,7 @@ import util.Directory._
 import util.ControlUtil._
 import util.JDBCUtil._
 import org.eclipse.jgit.api.Git
-import util.Directory
+import util.{DatabaseConfig, Directory}
 
 object AutoUpdate {
   
@@ -208,10 +208,7 @@ class AutoUpdateListener extends ServletContextListener {
     }
     org.h2.Driver.load()
 
-    val context = event.getServletContext
-    context.setInitParameter("db.url", s"jdbc:h2:${DatabaseHome};MVCC=true")
-
-    defining(getConnection(event.getServletContext)){ conn =>
+    defining(getConnection()){ conn =>
       logger.debug("Start schema update")
       try {
         defining(getCurrentVersion()){ currentVersion =>
@@ -239,16 +236,10 @@ class AutoUpdateListener extends ServletContextListener {
   def contextDestroyed(sce: ServletContextEvent): Unit = {
   }
 
-  private def getConnection(servletContext: ServletContext): Connection =
+  private def getConnection(): Connection =
     DriverManager.getConnection(
-      servletContext.getInitParameter("db.url"),
-      servletContext.getInitParameter("db.user"),
-      servletContext.getInitParameter("db.password"))
-
-  private def getDatabase(servletContext: ServletContext): scala.slick.jdbc.JdbcBackend.Database =
-    slick.jdbc.JdbcBackend.Database.forURL(
-      servletContext.getInitParameter("db.url"),
-      servletContext.getInitParameter("db.user"),
-      servletContext.getInitParameter("db.password"))
+      DatabaseConfig.url,
+      DatabaseConfig.user,
+      DatabaseConfig.password)
 
 }

src/main/scala/servlet/TransactionFilter.scala

@@ -1,27 +1,29 @@
 package servlet
 
 import javax.servlet._
-import org.slf4j.LoggerFactory
 import javax.servlet.http.HttpServletRequest
-import util.Keys
+import com.mchange.v2.c3p0.ComboPooledDataSource
+import org.slf4j.LoggerFactory
+import slick.jdbc.JdbcBackend.{Database => SlickDatabase, Session}
+import util.{DatabaseConfig, Keys}
 
 /**
  * Controls the transaction with the open session in view pattern.
  */
 class TransactionFilter extends Filter {
-  
+
   private val logger = LoggerFactory.getLogger(classOf[TransactionFilter])
-  
+
   def init(config: FilterConfig) = {}
-  
+
   def destroy(): Unit = {}
-  
+
   def doFilter(req: ServletRequest, res: ServletResponse, chain: FilterChain): Unit = {
     if(req.asInstanceOf[HttpServletRequest].getRequestURI().startsWith("/assets/")){
       // assets don't need transaction
       chain.doFilter(req, res)
     } else {
-      Database(req.getServletContext) withTransaction { session =>
+      Database() withTransaction { session =>
         logger.debug("begin transaction")
         req.setAttribute(Keys.Request.DBSession, session)
         chain.doFilter(req, res)
@@ -34,12 +36,24 @@ class TransactionFilter extends Filter {
 
 object Database {
 
-  def apply(context: ServletContext): slick.jdbc.JdbcBackend.Database =
-    slick.jdbc.JdbcBackend.Database.forURL(context.getInitParameter("db.url"),
-        context.getInitParameter("db.user"),
-        context.getInitParameter("db.password"))
+  private val logger = LoggerFactory.getLogger(Database.getClass)
 
-  def getSession(req: ServletRequest): slick.jdbc.JdbcBackend#Session =
-    req.getAttribute(Keys.Request.DBSession).asInstanceOf[slick.jdbc.JdbcBackend#Session]
+  private val db: SlickDatabase = {
+    val datasource = new ComboPooledDataSource
+
+    datasource.setDriverClass(DatabaseConfig.driver)
+    datasource.setJdbcUrl(DatabaseConfig.url)
+    datasource.setUser(DatabaseConfig.user)
+    datasource.setPassword(DatabaseConfig.password)
+
+    logger.debug("load database connection pool")
+
+    SlickDatabase.forDataSource(datasource)
+  }
+
+  def apply(): SlickDatabase = db
+
+  def getSession(req: ServletRequest): Session =
+    req.getAttribute(Keys.Request.DBSession).asInstanceOf[Session]
 
 }