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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.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.MessageFormat;
import org.apache.openjpa.conf.OpenJPAConfiguration;
import org.apache.openjpa.jdbc.conf.JDBCConfiguration;
import org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl;
import org.apache.openjpa.jdbc.identifier.DBIdentifier;
import org.apache.openjpa.jdbc.identifier.QualifiedDBIdentifier;
import org.apache.openjpa.jdbc.meta.ClassMapping;
import org.apache.openjpa.jdbc.schema.Schema;
import org.apache.openjpa.jdbc.schema.SchemaGroup;
import org.apache.openjpa.jdbc.schema.SchemaTool;
import org.apache.openjpa.jdbc.schema.Schemas;
import org.apache.openjpa.jdbc.schema.Sequence;
import org.apache.openjpa.jdbc.sql.DBDictionary;
import org.apache.openjpa.lib.conf.Configurable;
import org.apache.openjpa.lib.conf.Configuration;
import org.apache.openjpa.lib.conf.Configurations;
import org.apache.openjpa.lib.log.Log;
import org.apache.openjpa.lib.util.Localizer;
import org.apache.openjpa.lib.util.Options;
import org.apache.openjpa.util.MetaDataException;
import org.apache.openjpa.util.UserException;
///////////////////////////////////////////////////////////
// NOTE: Do not change property names; see SequenceMetaData
// and SequenceMapping for standard property names.
////////////////////////////////////////////////////////////
/**
* {@link JDBCSeq} implementation that uses a database sequence
* to generate numbers.
* Supports allocation (caching). In order for allocation to work properly, the database sequence must be defined
* with INCREMENT BY value equal to allocate * increment.
*
* @see JDBCSeq
* @see AbstractJDBCSeq
*/
public class NativeJDBCSeq
extends AbstractJDBCSeq
implements Configurable {
public static final String ACTION_DROP = "drop";
public static final String ACTION_ADD = "add";
public static final String ACTION_GET = "get";
private static Localizer _loc = Localizer.forPackage(NativeJDBCSeq.class);
private JDBCConfiguration _conf = null;
private DBIdentifier _seqName = DBIdentifier.newSequence("OPENJPA_SEQUENCE");
private int _increment = 1;
private int _initial = 1;
private int _allocate = 50;
private Sequence _seq = null;
private String _select = null;
private long _nextValue = 0;
private long _maxValue = -1;
private DBIdentifier _schema = DBIdentifier.NULL;
private boolean alterIncrementBy = false;
private boolean alreadyLoggedAlterSeqFailure = false;
/**
* The sequence name. Defaults to OPENJPA_SEQUENCE.
*/
// @GETTER
public String getSequence() {
return _seqName.getName();
}
/**
* The sequence name. Defaults to OPENJPA_SEQUENCE.
*/
public void setSequence(String seqName) {
_seqName = DBIdentifier.newSequence(seqName);
}
/**
* @see Sequence#getInitialValue
*/
public int getInitialValue() {
return _initial;
}
/**
* @see Sequence#setInitialValue
*/
public void setInitialValue(int initial) {
_initial = initial;
}
/**
* @see Sequence#getAllocate
*/
public int getAllocate() {
return _allocate;
}
/**
* @see Sequence#setAllocate
*/
public void setAllocate(int allocate) {
_allocate = allocate;
}
/**
* @see Sequence#getIncrement
*/
public int getIncrement() {
return _increment;
}
/**
* @see Sequence#setIncrement
*/
public void setIncrement(int increment) {
_increment = increment;
}
@Override
public void addSchema(ClassMapping mapping, SchemaGroup group) {
// sequence already exists?
QualifiedDBIdentifier path = QualifiedDBIdentifier.getPath(_seqName);
if (group.isKnownSequence(path))
return;
DBIdentifier schemaName = getSchemaIdentifier();
if (DBIdentifier.isEmpty(schemaName)) {
schemaName = path.getSchemaName();
if (DBIdentifier.isEmpty(schemaName))
schemaName = Schemas.getNewTableSchemaIdentifier(_conf);
}
// create table in this group
Schema schema = group.getSchema(schemaName);
if (schema == null)
schema = group.addSchema(schemaName);
schema.importSequence(_seq);
}
@Override
public JDBCConfiguration getConfiguration() {
return _conf;
}
public void setConfiguration(Configuration conf) {
_conf = (JDBCConfiguration) conf;
}
public void startConfiguration() {
}
public void endConfiguration() {
buildSequence();
DBDictionary dict = _conf.getDBDictionaryInstance();
String format = dict.nextSequenceQuery;
if (format == null) {
throw new MetaDataException(_loc.get("no-seq-sql", _seqName));
}
String name = dict.getFullName(_seq);
// Increment step is needed for Firebird which uses non-standard sequence fetch syntax.
// Use String.valueOf to get rid of possible locale-specific number formatting.
_select = MessageFormat.format(format, new Object[]{name, String.valueOf(_allocate * _increment)});
type = dict.nativeSequenceType;
}
@Override
protected synchronized Object nextInternal(JDBCStore store, ClassMapping mapping)
throws SQLException {
if (!alterIncrementBy) {
allocateInternal(0, store, mapping);
alterIncrementBy = true;
}
if (_nextValue >= _maxValue) {
allocateInternal(0, store, mapping);
}
long result = _nextValue;
_nextValue += _increment;
return result;
}
/**
* Allocate additional sequence values.
* @param additional ignored - the allocation size is fixed and determined by allocate and increment properties.
* @param store used to obtain connection
* @param mapping ignored
*/
@Override
protected synchronized void allocateInternal(int additional, JDBCStore store, ClassMapping mapping)
throws SQLException {
Connection conn = getConnection(store);
try {
if (!alterIncrementBy) {
DBDictionary dict = _conf.getDBDictionaryInstance();
// If this fails, we will warn the user at most one time and set _allocated and _increment to 1 so
// as to not potentially insert records ahead of what the database thinks is the next sequence value.
if (updateSql(conn, dict.getAlterSequenceSQL(_seq)) == -1) {
if (!alreadyLoggedAlterSeqFailure) {
Log log = _conf.getLog(OpenJPAConfiguration.LOG_RUNTIME);
if (log.isWarnEnabled()) {
log.warn(_loc.get("fallback-no-seq-cache", _seqName));
}
}
alreadyLoggedAlterSeqFailure = true;
_allocate = 1;
}
}
_nextValue = getSequence(conn);
_maxValue = _nextValue + _allocate * _increment;
} finally {
closeConnection(conn);
}
}
/**
* Creates the sequence object.
*/
private void buildSequence() {
QualifiedDBIdentifier path = QualifiedDBIdentifier.getPath(_seqName);
DBIdentifier seqName = path.getIdentifier();
// JPA 2 added schema as a configurable attribute on
// sequence generator. OpenJPA <= 1.x allowed this via
// schema.sequence on the sequence name. Specifying a schema
// name on the annotation or in the orm will override the old
// behavior.
DBIdentifier schemaName = _schema;
if (DBIdentifier.isEmpty(schemaName)) {
schemaName = path.getSchemaName();
if (DBIdentifier.isEmpty(schemaName))
schemaName = Schemas.getNewTableSchemaIdentifier(_conf);
}
// build the sequence in one of the designated schemas
SchemaGroup group = new SchemaGroup();
Schema schema = group.addSchema(schemaName);
_seq = schema.addSequence(seqName);
_seq.setInitialValue(_initial);
_seq.setIncrement(_increment);
_seq.setAllocate(_allocate);
}
/**
* Creates the sequence in the DB.
*/
public void refreshSequence()
throws SQLException {
Log log = _conf.getLog(OpenJPAConfiguration.LOG_RUNTIME);
if (log.isInfoEnabled())
log.info(_loc.get("make-native-seq"));
// create the sequence
SchemaTool tool = new SchemaTool(_conf);
tool.setIgnoreErrors(true);
tool.createSequence(_seq);
}
/**
* Drops the sequence in the DB.
*/
public void dropSequence()
throws SQLException {
Log log = _conf.getLog(OpenJPAConfiguration.LOG_RUNTIME);
if (log.isInfoEnabled())
log.info(_loc.get("drop-native-seq"));
// drop the table
SchemaTool tool = new SchemaTool(_conf);
tool.setIgnoreErrors(true);
tool.dropSequence(_seq);
}
/**
* Return the next sequence value.
*/
private long getSequence(Connection conn)
throws SQLException {
DBDictionary dict = _conf.getDBDictionaryInstance();
PreparedStatement stmnt = null;
ResultSet rs = null;
try {
stmnt = conn.prepareStatement(_select);
dict.setTimeouts(stmnt, _conf, false);
rs = stmnt.executeQuery();
if (rs.next())
return rs.getLong(1);
// no row !?
throw new UserException(_loc.get("invalid-seq-sql", _select));
} finally {
// clean up our resources
if (rs != null)
try { rs.close(); } catch (SQLException se) {}
if (stmnt != null)
try { stmnt.close(); } catch (SQLException se) {}
}
}
private int updateSql(Connection conn, String sql) throws SQLException {
DBDictionary dict = _conf.getDBDictionaryInstance();
PreparedStatement stmnt = null;
int rc = -1;
try {
stmnt = conn.prepareStatement(sql);
dict.setTimeouts(stmnt, _conf, false);
rc = stmnt.executeUpdate();
} catch (Exception e) {
// tolerate exception when attempting to alter increment,
// however, caller should check rc and not cache sequence values if rc != -1.
} finally {
// clean up our resources
if (stmnt != null) {
try {
stmnt.close();
} catch (SQLException se) {
}
}
}
return rc;
}
/////////
// Main
/////////
/**
* Usage: java org.apache.openjpa.jdbc.schema.NativeJDBCSequence [option]*
* -action/-a <add | drop | get>
* Where the following options are recognized.
*
*
-properties/-p <properties file or resource>: The
* path or resource name of an OpenJPA properties file containing
* information such as connection data as
* outlined in {@link JDBCConfiguration}. Optional.
*
-<property name> <property value>: All bean
* properties of the OpenJPA {@link JDBCConfiguration} can be set by
* using their names and supplying a value.
*
* The various actions are as follows.
*
*
add: Create the sequence.
*
drop: Drop the sequence.
*
get: Print the next sequence value.
*
*/
public static void main(String[] args)
throws Exception {
Options opts = new Options();
final String[] arguments = opts.setFromCmdLine(args);
boolean ret = Configurations.runAgainstAllAnchors(opts,
new Configurations.Runnable() {
public boolean run(Options opts) throws Exception {
JDBCConfiguration conf = new JDBCConfigurationImpl();
try {
return NativeJDBCSeq.run(conf, arguments, opts);
} finally {
conf.close();
}
}
});
if (!ret)
System.out.println(_loc.get("native-seq-usage"));
}
/**
* Run the tool. Returns false if invalid options were given.
*/
public static boolean run(JDBCConfiguration conf, String[] args,
Options opts)
throws Exception {
String action = opts.removeProperty("action", "a", null);
Configurations.populateConfiguration(conf, opts);
return run(conf, args, action);
}
/**
* Run the tool. Returns false if an invalid option was given.
*/
public static boolean run(JDBCConfiguration conf, String[] args,
String action)
throws Exception {
if (args.length != 0)
return false;
NativeJDBCSeq seq = new NativeJDBCSeq();
String props = Configurations.getProperties(conf.getSequence());
Configurations.configureInstance(seq, conf, props);
if (ACTION_DROP.equals(action))
seq.dropSequence();
else if (ACTION_ADD.equals(action))
seq.refreshSequence();
else if (ACTION_GET.equals(action)) {
Connection conn = conf.getDataSource2(null).getConnection();
try {
long cur = seq.getSequence(conn);
System.out.println(cur);
} finally {
try { conn.close(); } catch (SQLException se) {}
}
} else
return false;
return true;
}
/**
* @deprecated
*/
public void setSchema(String schema) {
_schema = DBIdentifier.newSchema(schema);
}
/**
* @deprecated
*/
public String getSchema() {
return _schema.getName();
}
public DBIdentifier getSchemaIdentifier() {
return _schema;
}
}
