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/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.activemq.store.jdbc;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.LinkedList;
import java.util.List;
import javax.sql.DataSource;
import org.apache.activemq.util.IOExceptionSupport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Helps keep track of the current transaction/JDBC connection.
*/
public class TransactionContext {
private static final Logger LOG = LoggerFactory.getLogger(TransactionContext.class);
private final DataSource dataSource;
private final JDBCPersistenceAdapter persistenceAdapter;
private Connection connection;
private boolean inTx;
private PreparedStatement addMessageStatement;
private PreparedStatement removedMessageStatement;
private PreparedStatement updateLastAckStatement;
// a cheap dirty level that we can live with
private int transactionIsolation = Connection.TRANSACTION_READ_UNCOMMITTED;
private LinkedList completions = new LinkedList();
public TransactionContext(JDBCPersistenceAdapter persistenceAdapter) throws IOException {
this.persistenceAdapter = persistenceAdapter;
this.dataSource = persistenceAdapter.getDataSource();
}
public Connection getConnection() throws IOException {
if (connection == null) {
try {
connection = dataSource.getConnection();
if (persistenceAdapter.isChangeAutoCommitAllowed()) {
boolean autoCommit = !inTx;
if (connection.getAutoCommit() != autoCommit) {
LOG.trace("Setting auto commit to {} on connection {}", autoCommit, connection);
connection.setAutoCommit(autoCommit);
}
}
} catch (SQLException e) {
JDBCPersistenceAdapter.log("Could not get JDBC connection: ", e);
inTx = false;
close();
IOException ioe = IOExceptionSupport.create(e);
persistenceAdapter.getBrokerService().handleIOException(ioe);
throw ioe;
}
try {
connection.setTransactionIsolation(transactionIsolation);
} catch (Throwable e) {
// ignore
LOG.trace("Cannot set transaction isolation to " + transactionIsolation + " due " + e.getMessage()
+ ". This exception is ignored.", e);
}
}
return connection;
}
public void executeBatch() throws SQLException {
try {
executeBatch(addMessageStatement, "Failed add a message");
} finally {
addMessageStatement = null;
try {
executeBatch(removedMessageStatement, "Failed to remove a message");
} finally {
removedMessageStatement = null;
try {
executeBatch(updateLastAckStatement, "Failed to ack a message");
} finally {
updateLastAckStatement = null;
}
}
}
}
private void executeBatch(PreparedStatement p, String message) throws SQLException {
if (p == null) {
return;
}
try {
int[] rc = p.executeBatch();
for (int i = 0; i < rc.length; i++) {
int code = rc[i];
if (code < 0 && code != Statement.SUCCESS_NO_INFO) {
throw new SQLException(message + ". Response code: " + code);
}
}
} finally {
try {
p.close();
} catch (Throwable e) {
}
}
}
public void close() throws IOException {
if (!inTx) {
try {
/**
* we are not in a transaction so should not be committing ??
* This was previously commented out - but had adverse affects
* on testing - so it's back!
*
*/
try {
executeBatch();
} finally {
if (connection != null && !connection.getAutoCommit()) {
connection.commit();
}
}
} catch (SQLException e) {
JDBCPersistenceAdapter.log("Error while closing connection: ", e);
IOException ioe = IOExceptionSupport.create(e);
persistenceAdapter.getBrokerService().handleIOException(ioe);
throw ioe;
} finally {
try {
if (connection != null) {
connection.close();
}
} catch (Throwable e) {
// ignore
LOG.trace("Closing connection failed due: " + e.getMessage() + ". This exception is ignored.", e);
} finally {
connection = null;
}
for (Runnable completion: completions) {
completion.run();
}
}
}
}
public void begin() throws IOException {
if (inTx) {
throw new IOException("Already started.");
}
inTx = true;
connection = getConnection();
}
public void commit() throws IOException {
if (!inTx) {
throw new IOException("Not started.");
}
try {
executeBatch();
if (!connection.getAutoCommit()) {
connection.commit();
}
} catch (SQLException e) {
JDBCPersistenceAdapter.log("Commit failed: ", e);
try {
doRollback();
} catch (Exception ignored) {}
IOException ioe = IOExceptionSupport.create(e);
persistenceAdapter.getBrokerService().handleIOException(ioe);
throw ioe;
} finally {
inTx = false;
close();
}
}
public void rollback() throws IOException {
if (!inTx) {
throw new IOException("Not started.");
}
try {
doRollback();
} catch (SQLException e) {
JDBCPersistenceAdapter.log("Rollback failed: ", e);
throw IOExceptionSupport.create(e);
} finally {
inTx = false;
close();
}
}
private void doRollback() throws SQLException {
if (addMessageStatement != null) {
addMessageStatement.close();
addMessageStatement = null;
}
if (removedMessageStatement != null) {
removedMessageStatement.close();
removedMessageStatement = null;
}
if (updateLastAckStatement != null) {
updateLastAckStatement.close();
updateLastAckStatement = null;
}
connection.rollback();
}
public PreparedStatement getAddMessageStatement() {
return addMessageStatement;
}
public void setAddMessageStatement(PreparedStatement addMessageStatement) {
this.addMessageStatement = addMessageStatement;
}
public PreparedStatement getUpdateLastAckStatement() {
return updateLastAckStatement;
}
public void setUpdateLastAckStatement(PreparedStatement ackMessageStatement) {
this.updateLastAckStatement = ackMessageStatement;
}
public PreparedStatement getRemovedMessageStatement() {
return removedMessageStatement;
}
public void setRemovedMessageStatement(PreparedStatement removedMessageStatement) {
this.removedMessageStatement = removedMessageStatement;
}
public void setTransactionIsolation(int transactionIsolation) {
this.transactionIsolation = transactionIsolation;
}
public void onCompletion(Runnable runnable) {
completions.add(runnable);
}
}