org.apache.openjpa.jdbc.kernel.AbstractJDBCSeq Maven / Gradle / Ivy
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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.openjpa.jdbc.kernel;
import java.sql.Connection;
import java.sql.SQLException;
import javax.sql.DataSource;
import org.apache.openjpa.jdbc.conf.JDBCConfiguration;
import org.apache.openjpa.jdbc.meta.ClassMapping;
import org.apache.openjpa.jdbc.schema.SchemaGroup;
import org.apache.openjpa.jdbc.sql.SQLExceptions;
import org.apache.openjpa.kernel.StoreContext;
import org.apache.openjpa.kernel.StoreManager;
import org.apache.openjpa.meta.ClassMetaData;
import org.apache.openjpa.util.OpenJPAException;
import org.apache.openjpa.util.StoreException;
/**
* Abstract sequence implementation. Handles obtaining the proper
* connection to used based on whether the sequence is transactional and
* whether a second datasource is configured.
*
* @author Abe White
*/
public abstract class AbstractJDBCSeq
implements JDBCSeq {
protected int type = TYPE_DEFAULT;
protected Object current = null;
/**
* Records the sequence type.
*/
@Override
public void setType(int type) {
this.type = type;
}
@Override
public Object next(StoreContext ctx, ClassMetaData meta) {
JDBCStore store = getStore(ctx);
try {
Object currentLocal = nextInternal(store, (ClassMapping) meta);
current = currentLocal;
return currentLocal;
} catch (OpenJPAException ke) {
throw ke;
} catch (SQLException se) {
throw SQLExceptions.getStore(se, store.getDBDictionary());
} catch (Exception e) {
throw new StoreException(e);
}
}
@Override
public Object current(StoreContext ctx, ClassMetaData meta) {
JDBCStore store = getStore(ctx);
try {
return currentInternal(store, (ClassMapping) meta);
} catch (OpenJPAException ke) {
throw ke;
} catch (SQLException se) {
throw SQLExceptions.getStore(se, store.getDBDictionary());
} catch (Exception e) {
throw new StoreException(e);
}
}
@Override
public void allocate(int additional, StoreContext ctx, ClassMetaData meta) {
JDBCStore store = getStore(ctx);
try {
allocateInternal(additional, store, (ClassMapping) meta);
} catch (OpenJPAException ke) {
throw ke;
} catch (SQLException se) {
throw SQLExceptions.getStore(se, store.getDBDictionary());
} catch (Exception e) {
throw new StoreException(e);
}
}
/**
* No-op.
*/
@Override
public void addSchema(ClassMapping mapping, SchemaGroup group) {
}
/**
* No-op.
*/
@Override
public void close() {
}
/**
* Return the next sequence object.
*/
protected abstract Object nextInternal(JDBCStore store,
ClassMapping mapping)
throws Exception;
/**
* Return the {@link JDBCConfiguration} for this sequence.
*/
public abstract JDBCConfiguration getConfiguration();
/**
* Return the current sequence object. By default returns the last
* sequence value used, or null if no sequence values have been requested
* yet. Default implementation is not threadsafe.
*/
protected Object currentInternal(JDBCStore store, ClassMapping mapping)
throws Exception {
return current;
}
/**
* Allocate additional sequence values. Does nothing by default.
*/
protected void allocateInternal(int additional, JDBCStore store,
ClassMapping mapping)
throws Exception {
}
/**
* Extract the store from the given context.
*/
private JDBCStore getStore(StoreContext ctx) {
return (JDBCStore) ctx.getStoreManager().getInnermostDelegate();
}
/**
* Return the connection to use based on the type of sequence. This
* connection will automatically be closed; do not close it.
*
* @return If the sequence type is TYPE_TRANSACTIONAL or
* TYPE_CONTIGUOUS the connection from the {@link StoreManager}
* will be returned.
*
* Otherwise a new connection will be obtained using DataSource2 from the
* current configuration. In this case autocommit is set to false prior to
* returning the connection.
*/
protected Connection getConnection(JDBCStore store)
throws SQLException {
if (type == TYPE_TRANSACTIONAL || type == TYPE_CONTIGUOUS) {
// Also increments ref count.
return store.getConnection();
}
else {
JDBCConfiguration conf = store.getConfiguration();
DataSource ds = conf.getDataSource2(store.getContext());
Connection conn = ds.getConnection();
if (conn.getAutoCommit())
conn.setAutoCommit(false);
return conn;
}
}
/**
* Close the current connection. If the sequence is
* TYPE_TRANSACTIONAL or TYPE_CONTIGUOUS
* we will decrement the ref count. Otherwise the connection will be
* committed and then closed.
*/
protected void closeConnection(Connection conn) {
if (conn == null)
return;
if (type == TYPE_TRANSACTIONAL || type == TYPE_CONTIGUOUS) {
// The seq is part of the business transaction however we need
// to decrement the ref count so that the connection may be
// closed appropriately.
try {
conn.close();
}
catch(SQLException se) {
throw SQLExceptions.getStore(se);
}
return;
}
else {
try {
conn.commit();
} catch (SQLException se) {
throw SQLExceptions.getStore(se);
} finally {
try { conn.close(); } catch (SQLException se) {}
}
}
}
/**
* Detect whether or not OpenJPA should suspend the transaction in
* a managed environment.
*/
protected boolean suspendInJTA() {
return getConfiguration().isConnectionFactoryModeManaged() &&
getConfiguration().getConnectionFactory2() == null;
}
}