org.eclipse.persistence.sequencing.QuerySequence Maven / Gradle / Ivy
Show all versions of org.eclipse.persistence.core Show documentation
/*
* Copyright (c) 1998, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// Oracle - initial API and implementation from Oracle TopLink
// 06/30/2011-2.3.1 Guy Pelletier
// - 341940: Add disable/enable allowing native queries
package org.eclipse.persistence.sequencing;
import java.util.Vector;
import java.math.BigDecimal;
import org.eclipse.persistence.sessions.Record;
import org.eclipse.persistence.queries.*;
import org.eclipse.persistence.internal.databaseaccess.Accessor;
import org.eclipse.persistence.internal.sessions.AbstractSession;
/**
*
* Purpose: An generic query sequence mechanism.
*
* Description
* This sequence allows the sequence operations to be customized through user defined queries.
* A select and update query can be set which can use custom SQL or stored procedures to define the sequencing mechanism.
* If a single stored procedure is used that does the update and select only the select query needs to be set.
*/
public class QuerySequence extends StandardSequence {
protected ValueReadQuery selectQuery;
protected DataModifyQuery updateQuery;
protected boolean shouldAcquireValueAfterInsert;
protected boolean shouldUseTransaction;
protected boolean shouldSkipUpdate;
protected boolean shouldSelectBeforeUpdate;
protected boolean wasSelectQueryCreated;
protected boolean wasUpdateQueryCreated;
public QuerySequence() {
super();
}
/**
* Create a new sequence with the name.
*/
public QuerySequence(String name) {
super(name);
}
/**
* Create a new sequence with the name and sequence pre-allocation size.
*/
public QuerySequence(String name, int size) {
super(name, size);
}
public QuerySequence(String name, int size, int initialValue) {
super(name, size, initialValue);
}
public QuerySequence(boolean shouldAcquireValueAfterInsert, boolean shouldUseTransaction) {
super();
setShouldAcquireValueAfterInsert(shouldAcquireValueAfterInsert);
setShouldUseTransaction(shouldUseTransaction);
}
public QuerySequence(String name, boolean shouldAcquireValueAfterInsert, boolean shouldUseTransaction) {
super(name);
setShouldAcquireValueAfterInsert(shouldAcquireValueAfterInsert);
setShouldUseTransaction(shouldUseTransaction);
}
public QuerySequence(String name, int size, boolean shouldAcquireValueAfterInsert, boolean shouldUseTransaction) {
super(name, size);
setShouldAcquireValueAfterInsert(shouldAcquireValueAfterInsert);
setShouldUseTransaction(shouldUseTransaction);
}
public QuerySequence(String name, int size, int initialValue,
boolean shouldAcquireValueAfterInsert, boolean shouldUseTransaction) {
super(name, size, initialValue);
setShouldAcquireValueAfterInsert(shouldAcquireValueAfterInsert);
setShouldUseTransaction(shouldUseTransaction);
}
public boolean equals(Object obj) {
if (obj instanceof QuerySequence && super.equals(obj)) {
QuerySequence other = (QuerySequence)obj;
return (getSelectQuery() == other.getSelectQuery()) && (getUpdateQuery() == other.getUpdateQuery()) && (shouldAcquireValueAfterInsert() == other.shouldAcquireValueAfterInsert()) && (shouldUseTransaction() == other.shouldUseTransaction()) && (shouldSkipUpdate() == other.shouldSkipUpdate()) && (shouldSelectBeforeUpdate() == other.shouldSelectBeforeUpdate());
} else {
return false;
}
}
@Override
public int hashCode() {
int result = super.hashCode();
ValueReadQuery selectQuery = getSelectQuery();
DataModifyQuery updateQuery = getUpdateQuery();
result = 31 * result + (selectQuery != null ? selectQuery.hashCode() : 0);
result = 31 * result + (updateQuery != null ? updateQuery.hashCode() : 0);
result = 31 * result + (shouldAcquireValueAfterInsert() ? 1 : 0);
result = 31 * result + (shouldUseTransaction() ? 1 : 0);
result = 31 * result + (shouldSkipUpdate() ? 1 : 0);
result = 31 * result + (shouldSelectBeforeUpdate() ? 1 : 0);
return result;
}
/**
* PUBLIC:
*/
public boolean shouldAcquireValueAfterInsert() {
return shouldAcquireValueAfterInsert;
}
/**
* PUBLIC:
*/
public void setShouldAcquireValueAfterInsert(boolean shouldAcquireValueAfterInsert) {
this.shouldAcquireValueAfterInsert = shouldAcquireValueAfterInsert;
}
/**
* PUBLIC:
*/
public boolean shouldUseTransaction() {
return shouldUseTransaction;
}
/**
* PUBLIC:
*/
public void setShouldUseTransaction(boolean shouldUseTransaction) {
this.shouldUseTransaction = shouldUseTransaction;
}
/**
* PUBLIC:
*/
public void setSelectQuery(ValueReadQuery query) {
selectQuery = query;
}
/**
* PUBLIC:
*/
public ValueReadQuery getSelectQuery() {
return selectQuery;
}
/**
* PUBLIC:
*/
public void setUpdateQuery(DataModifyQuery query) {
updateQuery = query;
}
/**
* PUBLIC:
*/
public DataModifyQuery getUpdateQuery() {
return updateQuery;
}
/**
* PUBLIC:
*/
public void setShouldSkipUpdate(boolean shouldSkipUpdate) {
this.shouldSkipUpdate = shouldSkipUpdate;
}
/**
* PUBLIC:
*/
public boolean shouldSkipUpdate() {
return shouldSkipUpdate;
}
/**
* PUBLIC:
*/
public void setShouldSelectBeforeUpdate(boolean shouldSelectBeforeUpdate) {
this.shouldSelectBeforeUpdate = shouldSelectBeforeUpdate;
}
/**
* PUBLIC:
*/
public boolean shouldSelectBeforeUpdate() {
return shouldSelectBeforeUpdate;
}
/**
* INTERNAL:
*/
protected ValueReadQuery buildSelectQuery() {
return null;
}
/**
* INTERNAL:
*/
protected DataModifyQuery buildUpdateQuery() {
return null;
}
/**
* INTERNAL:
*/
protected ValueReadQuery buildSelectQuery(String seqName, Integer size) {
return null;
}
/**
* INTERNAL:
*/
protected DataModifyQuery buildUpdateQuery(String seqName, Number sizeOrNewValue) {
return null;
}
/**
* INTERNAL:
*/
public void onConnect() {
super.onConnect();
if (getSelectQuery() == null) {
setSelectQuery(buildSelectQuery());
wasSelectQueryCreated = getSelectQuery() != null;
if (wasSelectQueryCreated) {
getSelectQuery().setName(getName());
}
}
if ((getUpdateQuery() == null) && !shouldSkipUpdate()) {
setUpdateQuery(buildUpdateQuery());
wasUpdateQueryCreated = getUpdateQuery() != null;
if (wasUpdateQueryCreated) {
getUpdateQuery().setName(getName());
}
}
}
/**
* INTERNAL:
*/
public void onDisconnect() {
if (wasSelectQueryCreated) {
setSelectQuery(null);
wasSelectQueryCreated = false;
}
if (wasUpdateQueryCreated) {
setUpdateQuery(null);
wasUpdateQueryCreated = false;
}
super.onDisconnect();
}
/**
* INTERNAL:
*/
protected Number updateAndSelectSequence(Accessor accessor, AbstractSession writeSession, String seqName, int size) {
Integer sizeInteger = Integer.valueOf(size);
if (shouldSkipUpdate()) {
return (Number)select(accessor, writeSession, seqName, sizeInteger);
} else {
if (shouldSelectBeforeUpdate()) {
Object result = select(accessor, writeSession, seqName, sizeInteger);
BigDecimal currentValue;
if (result instanceof Number) {
currentValue = BigDecimal.valueOf(((Number)result).longValue());
} else if (result instanceof String) {
currentValue = new BigDecimal((String)result);
} else if (result instanceof Record) {
Object val = ((Record)result).get("text()");
currentValue = new BigDecimal((String)val);
} else {
// DatabaseException.errorPreallocatingSequenceNumbers() is thrown by the superclass
return null;
}
// Increment value
BigDecimal newValue = currentValue.add(new BigDecimal(size));
update(accessor, writeSession, seqName, newValue);
return newValue;
} else {
update(accessor, writeSession, seqName, sizeInteger);
return (Number)select(accessor, writeSession, seqName, sizeInteger);
}
}
}
/**
* INTERNAL:
*/
protected Object select(Accessor accessor, AbstractSession writeSession, String seqName, Integer size) {
ValueReadQuery query = getSelectQuery();
if (query != null) {
if (accessor != null) {
// PERF: Prepare the query before being cloned.
// Also BUG: SQLCall could not be prepared concurrently by different queries.
// Setting user define allow custom SQL query to be prepared without translation row.
query.setIsUserDefined(true);
query.checkPrepare(writeSession, null);
query = (ValueReadQuery)query.clone();
query.setAccessor(accessor);
}
} else {
query = buildSelectQuery(seqName, size);
if (accessor != null) {
query.setAccessor(accessor);
}
}
Vector args = createArguments(query, seqName, size);
query.setIsUserDefinedSQLCall(false);
if (args != null) {
return writeSession.executeQuery(query, args);
} else {
return writeSession.executeQuery(query);
}
}
/**
* INTERNAL:
*/
protected void update(Accessor accessor, AbstractSession writeSession, String seqName, Number sizeOrNewValue) {
DataModifyQuery query = getUpdateQuery();
if (query != null) {
if (accessor != null) {
// PERF: Prepare the query before being cloned.
// Also BUG: SQLCall could not be prepared concurrently by different queries.
// Setting user define allow custom SQL query to be prepared without translation row.
query.setIsUserDefined(true);
query.checkPrepare(writeSession, null);
query = (DataModifyQuery)query.clone();
query.setAccessor(accessor);
}
} else {
query = buildUpdateQuery(seqName, sizeOrNewValue);
if (query == null) {
return;
}
if (accessor != null) {
query.setAccessor(accessor);
}
}
Vector args = createArguments(query, seqName, sizeOrNewValue);
query.setIsUserDefinedSQLCall(false);
if (args != null) {
writeSession.executeQuery(query, args);
} else {
writeSession.executeQuery(query);
}
}
/**
* INTERNAL:
*/
protected Vector createArguments(DatabaseQuery query, String seqName, Number sizeOrNewValue) {
int nArgs = query.getArguments().size();
if (nArgs > 0) {
Vector args = new Vector(nArgs);
args.addElement(seqName);
if (nArgs > 1) {
args.addElement(sizeOrNewValue);
}
return args;
} else {
return null;
}
}
}