[server] db stuff, new interface, ...

1 files changed, 74 insertions, 0 deletions

diff --git a/dozentenmodulserver/src/main/java/sql/MysqlConnection.java b/dozentenmodulserver/src/main/java/sql/MysqlConnection.java
new file mode 100644
index 00000000..dbbddfe1
--- /dev/null
+++ b/dozentenmodulserver/src/main/java/sql/MysqlConnection.java
@@ -0,0 +1,74 @@
+package sql;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.log4j.Logger;
+
+public class MysqlConnection implements AutoCloseable {
+
+	private static final Logger LOGGER = Logger.getLogger(MysqlConnection.class);
+
+	private static final int CONNECTION_TIMEOUT_MS = 5 * 60 * 1000;
+
+	private final long deadline = System.currentTimeMillis() + CONNECTION_TIMEOUT_MS;
+
+	private final Connection rawConnection;
+
+	private boolean hasPendingQueries = false;
+
+	private List<MysqlStatement> openStatements = new ArrayList<>();
+
+	MysqlConnection(Connection rawConnection) {
+		this.rawConnection = rawConnection;
+	}
+
+	public MysqlStatement prepareStatement(String sql) throws SQLException {
+		hasPendingQueries = true;
+		MysqlStatement statement = new MysqlStatement(rawConnection, sql);
+		openStatements.add(statement);
+		return statement;
+	}
+
+	public void commit() throws SQLException {
+		rawConnection.commit();
+		hasPendingQueries = false;
+	}
+
+	public void rollback() throws SQLException {
+		rawConnection.rollback();
+		hasPendingQueries = false;
+	}
+
+	boolean isValid() {
+		return System.currentTimeMillis() < deadline;
+	}
+
+	@Override
+	public void close() {
+		if (hasPendingQueries) {
+			LOGGER.warn("Mysql connection had uncommited queries on .close()");
+			try {
+				rawConnection.rollback();
+			} catch (SQLException e) {
+				LOGGER.warn("Rolling back uncommited queries failed!", e);
+			}
+			for (MysqlStatement statement : openStatements) {
+				statement.close();
+			}
+			openStatements.clear();
+		}
+		SQL.returnConnection(this);
+	}
+
+	void release() {
+		try {
+			rawConnection.close();
+		} catch (SQLException e) {
+			// Nothing meaningful to do
+		}
+	}
+
+}