org.activiti.MultiTenantSqlSessionFactory.java Source code

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Here is the source code for org.activiti.MultiTenantSqlSessionFactory.java

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/* Licensed 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.activiti;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Map;

import org.activiti.tenant.TenantInfoHolder;
import org.apache.ibatis.exceptions.ExceptionFactory;
import org.apache.ibatis.executor.ErrorContext;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.Environment;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ExecutorType;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.TransactionIsolationLevel;
import org.apache.ibatis.session.defaults.DefaultSqlSession;
import org.apache.ibatis.transaction.Transaction;
import org.apache.ibatis.transaction.TransactionFactory;
import org.apache.ibatis.transaction.managed.ManagedTransactionFactory;

/**
 * @author Joram Barrez
 */
public class MultiTenantSqlSessionFactory implements SqlSessionFactory {

    protected TenantInfoHolder tenantInfoHolder;

    /** Maps {tenantId, Coniguration */
    protected Map<String, Configuration> configMapping = new HashMap<String, Configuration>();

    public MultiTenantSqlSessionFactory(TenantInfoHolder tenantInfoHolder) {
        this.tenantInfoHolder = tenantInfoHolder;
    }

    public void addConfig(String tenantId, Configuration configuration) {
        configMapping.put(tenantId, configuration);
    }

    public Configuration getConfiguration() {
        return configMapping.get(tenantInfoHolder.getCurrentTenantId());
    }

    public SqlSession openSession() {
        return openSessionFromDataSource(getConfiguration().getDefaultExecutorType(), null, false);
    }

    public SqlSession openSession(boolean autoCommit) {
        return openSessionFromDataSource(getConfiguration().getDefaultExecutorType(), null, autoCommit);
    }

    public SqlSession openSession(ExecutorType execType) {
        return openSessionFromDataSource(execType, null, false);
    }

    public SqlSession openSession(TransactionIsolationLevel level) {
        return openSessionFromDataSource(getConfiguration().getDefaultExecutorType(), level, false);
    }

    public SqlSession openSession(ExecutorType execType, TransactionIsolationLevel level) {
        return openSessionFromDataSource(execType, level, false);
    }

    public SqlSession openSession(ExecutorType execType, boolean autoCommit) {
        return openSessionFromDataSource(execType, null, autoCommit);
    }

    public SqlSession openSession(Connection connection) {
        return openSessionFromConnection(getConfiguration().getDefaultExecutorType(), connection);
    }

    public SqlSession openSession(ExecutorType execType, Connection connection) {
        return openSessionFromConnection(execType, connection);
    }

    private SqlSession openSessionFromDataSource(ExecutorType execType, TransactionIsolationLevel level,
            boolean autoCommit) {
        Transaction tx = null;
        try {
            final Environment environment = getConfiguration().getEnvironment();
            final TransactionFactory transactionFactory = getTransactionFactoryFromEnvironment(environment);
            tx = transactionFactory.newTransaction(environment.getDataSource(), level, autoCommit);
            final Executor executor = getConfiguration().newExecutor(tx, execType, autoCommit);
            return new DefaultSqlSession(getConfiguration(), executor);
        } catch (Exception e) {
            closeTransaction(tx); // may have fetched a connection so lets call close()
            throw ExceptionFactory.wrapException("Error opening session.  Cause: " + e, e);
        } finally {
            ErrorContext.instance().reset();
        }
    }

    private SqlSession openSessionFromConnection(ExecutorType execType, Connection connection) {
        try {
            final Environment environment = getConfiguration().getEnvironment();
            final TransactionFactory transactionFactory = getTransactionFactoryFromEnvironment(environment);
            final Transaction tx = transactionFactory.newTransaction(connection);
            final Executor executor = getConfiguration().newExecutor(tx, execType, connection.getAutoCommit());
            return new DefaultSqlSession(getConfiguration(), executor);
        } catch (Exception e) {
            throw ExceptionFactory.wrapException("Error opening session.  Cause: " + e, e);
        } finally {
            ErrorContext.instance().reset();
        }
    }

    private TransactionFactory getTransactionFactoryFromEnvironment(Environment environment) {
        if (environment == null || environment.getTransactionFactory() == null) {
            return new ManagedTransactionFactory();
        }
        return environment.getTransactionFactory();
    }

    private void closeTransaction(Transaction tx) {
        if (tx != null) {
            try {
                tx.close();
            } catch (SQLException ignore) {
                // Intentionally ignore. Prefer previous error.
            }
        }
    }

}