added connection provider for the jdbc backend

scm-backend-jdbc/src/main/java/sonia/scm/jdbc/DataSourceConnectionProvider.java

@@ -0,0 +1,129 @@
+/**
+ * Copyright (c) 2010, Sebastian Sdorra All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer. 2. Redistributions in
+ * binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other
+ * materials provided with the distribution. 3. Neither the name of SCM-Manager;
+ * nor the names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://bitbucket.org/sdorra/scm-manager
+ *
+ */
+
+
+
+package sonia.scm.jdbc;
+
+//~--- non-JDK imports --------------------------------------------------------
+
+import com.google.inject.Provider;
+import com.google.inject.Singleton;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import sonia.scm.BackendException;
+
+//~--- JDK imports ------------------------------------------------------------
+
+import java.sql.Connection;
+import java.sql.SQLException;
+
+
+import javax.naming.InitialContext;
+
+import javax.sql.DataSource;
+
+/**
+ * Provider for jdbc database connections. This provider uses jndi to get the
+ * {@link DataSource} from the application server.
+ *
+ * @author Sebastian Sdorra
+ */
+@Singleton
+public class DataSourceConnectionProvider implements Provider<Connection>
+{
+
+  /** jndi resource for the database connection */
+  public static final String JNDI_DATASOURCE =
+    "java:comp/env/jdbc/scm-mananger";
+
+  /**
+   * the logger for DataSourceConnectionProvider
+   */
+  private static final Logger logger =
+    LoggerFactory.getLogger(DataSourceConnectionProvider.class);
+
+  //~--- constructors ---------------------------------------------------------
+
+  /**
+   * Constructs ...
+   *
+   */
+  public DataSourceConnectionProvider()
+  {
+    try
+    {
+      InitialContext ic = new InitialContext();
+
+      dataSource = (DataSource) ic.lookup(JNDI_DATASOURCE);
+    }
+    catch (Exception ex)
+    {
+      throw new BackendException("could not fetch datasource", ex);
+    }
+  }
+
+  //~--- get methods ----------------------------------------------------------
+
+  /**
+   * Method description
+   *
+   *
+   * @return
+   */
+  @Override
+  public Connection get()
+  {
+    if (logger.isTraceEnabled())
+    {
+      logger.trace("return new database connection from datasource");
+    }
+
+    Connection connection = null;
+
+    try
+    {
+      connection = dataSource.getConnection();
+    }
+    catch (SQLException ex)
+    {
+      throw new BackendException(
+          "could not get database connection from datasource", ex);
+    }
+
+    return connection;
+  }
+
+  //~--- fields ---------------------------------------------------------------
+
+  /** Field description */
+  private DataSource dataSource;
+}