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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2010, Red Hat Inc. or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.id.enhanced;
import java.io.Serializable;
import java.lang.reflect.Constructor;
import org.jboss.logging.Logger;
import org.hibernate.HibernateException;
import org.hibernate.id.IntegralDataTypeHolder;
import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.internal.util.ReflectHelper;
import org.hibernate.internal.util.StringHelper;
/**
* Factory for {@link Optimizer} instances.
*
* @author Steve Ebersole
*/
public class OptimizerFactory {
private static final CoreMessageLogger LOG = Logger.getMessageLogger(
CoreMessageLogger.class,
OptimizerFactory.class.getName()
);
public static enum StandardOptimizerDescriptor {
NONE( "none", NoopOptimizer.class ),
HILO( "hilo", HiLoOptimizer.class ),
LEGACY_HILO( "legacy-hilo", LegacyHiLoAlgorithmOptimizer.class ),
POOLED( "pooled", PooledOptimizer.class, true ),
POOLED_LO( "pooled-lo", PooledLoOptimizer.class, true );
private final String externalName;
private final Class optimizerClass;
private final boolean isPooled;
StandardOptimizerDescriptor(String externalName, Class optimizerClass) {
this( externalName, optimizerClass, false );
}
StandardOptimizerDescriptor(String externalName, Class optimizerClass, boolean pooled) {
this.externalName = externalName;
this.optimizerClass = optimizerClass;
this.isPooled = pooled;
}
public String getExternalName() {
return externalName;
}
public Class getOptimizerClass() {
return optimizerClass;
}
public boolean isPooled() {
return isPooled;
}
public static StandardOptimizerDescriptor fromExternalName(String externalName) {
if ( StringHelper.isEmpty( externalName ) ) {
LOG.debug( "No optimizer specified, using NONE as default" );
return NONE;
}
else if ( NONE.externalName.equals( externalName ) ) {
return NONE;
}
else if ( HILO.externalName.equals( externalName ) ) {
return HILO;
}
else if ( LEGACY_HILO.externalName.equals( externalName ) ) {
return LEGACY_HILO;
}
else if ( POOLED.externalName.equals( externalName ) ) {
return POOLED;
}
else if ( POOLED_LO.externalName.equals( externalName ) ) {
return POOLED_LO;
}
else {
LOG.debugf( "Unknown optimizer key [%s]; returning null assuming Optimizer impl class name", externalName );
return null;
}
}
}
/**
* Marker interface for optimizer which wish to know the user-specified initial value.
*
* Used instead of constructor injection since that is already a public understanding and
* because not all optimizers care.
*/
public static interface InitialValueAwareOptimizer {
/**
* Reports the user specified initial value to the optimizer.
*
* -1 is used to indicate that the user did not specify.
*
* @param initialValue The initial value specified by the user, or -1 to indicate that the
* user did not specify.
*/
public void injectInitialValue(long initialValue);
}
public static boolean isPooledOptimizer(String type) {
final StandardOptimizerDescriptor standardDescriptor = StandardOptimizerDescriptor.fromExternalName( type );
return standardDescriptor != null && standardDescriptor.isPooled();
}
private static Class[] CTOR_SIG = new Class[] { Class.class, int.class };
/**
* Builds an optimizer
*
* @param type The optimizer type, either a short-hand name or the {@link Optimizer} class name.
* @param returnClass The generated value java type
* @param incrementSize The increment size.
*
* @return The built optimizer
*
* @deprecated Use {@link #buildOptimizer(String, Class, int, long)} instead
*/
@Deprecated
@SuppressWarnings( {"UnnecessaryBoxing", "unchecked"})
public static Optimizer buildOptimizer(String type, Class returnClass, int incrementSize) {
final Class optimizerClass;
final StandardOptimizerDescriptor standardDescriptor = StandardOptimizerDescriptor.fromExternalName( type );
if ( standardDescriptor != null ) {
optimizerClass = standardDescriptor.getOptimizerClass();
}
else {
try {
optimizerClass = ReflectHelper.classForName( type );
}
catch( Throwable ignore ) {
LOG.unableToLocateCustomOptimizerClass( type );
return buildFallbackOptimizer( returnClass, incrementSize );
}
}
try {
Constructor ctor = optimizerClass.getConstructor( CTOR_SIG );
return ( Optimizer ) ctor.newInstance( returnClass, Integer.valueOf( incrementSize ) );
}
catch( Throwable ignore ) {
LOG.unableToInstantiateOptimizer( type );
}
return buildFallbackOptimizer( returnClass, incrementSize );
}
private static Optimizer buildFallbackOptimizer(Class returnClass, int incrementSize) {
return new NoopOptimizer( returnClass, incrementSize );
}
/**
* Builds an optimizer
*
* @param type The optimizer type, either a short-hand name or the {@link Optimizer} class name.
* @param returnClass The generated value java type
* @param incrementSize The increment size.
* @param explicitInitialValue The user supplied initial-value (-1 indicates the user did not specify).
*
* @return The built optimizer
*/
@SuppressWarnings({ "UnnecessaryBoxing", "deprecation" })
public static Optimizer buildOptimizer(String type, Class returnClass, int incrementSize, long explicitInitialValue) {
final Optimizer optimizer = buildOptimizer( type, returnClass, incrementSize );
if ( InitialValueAwareOptimizer.class.isInstance( optimizer ) ) {
( (InitialValueAwareOptimizer) optimizer ).injectInitialValue( explicitInitialValue );
}
return optimizer;
}
/**
* Common support for optimizer implementations.
*/
public static abstract class OptimizerSupport implements Optimizer {
protected final Class returnClass;
protected final int incrementSize;
/**
* Construct an optimizer
*
* @param returnClass The expected id class.
* @param incrementSize The increment size
*/
protected OptimizerSupport(Class returnClass, int incrementSize) {
if ( returnClass == null ) {
throw new HibernateException( "return class is required" );
}
this.returnClass = returnClass;
this.incrementSize = incrementSize;
}
/**
* Getter for property 'returnClass'. This is the Java
* class which is used to represent the id (e.g. {@link java.lang.Long}).
*
* @return Value for property 'returnClass'.
*/
@SuppressWarnings( {"UnusedDeclaration"})
public final Class getReturnClass() {
return returnClass;
}
@Override
public final int getIncrementSize() {
return incrementSize;
}
}
/**
* An optimizer that performs no optimization. The database is hit for
* every request.
*/
public static class NoopOptimizer extends OptimizerSupport {
private IntegralDataTypeHolder lastSourceValue;
public NoopOptimizer(Class returnClass, int incrementSize) {
super( returnClass, incrementSize );
}
@Override
public Serializable generate(AccessCallback callback) {
// IMPL NOTE : it is incredibly important that the method-local variable be used here to
// avoid concurrency issues.
IntegralDataTypeHolder value = null;
while ( value == null || value.lt( 1 ) ) {
value = callback.getNextValue();
}
lastSourceValue = value;
return value.makeValue();
}
@Override
public IntegralDataTypeHolder getLastSourceValue() {
return lastSourceValue;
}
@Override
public boolean applyIncrementSizeToSourceValues() {
return false;
}
}
/**
* Optimizer which applies a 'hilo' algorithm in memory to achieve
* optimization.
*
* A 'hilo' algorithm is simply a means for a single value stored in the
* database to represent a "bucket" of possible, contiguous values. The
* database value identifies which particular bucket we are on.
*
* This database value must be paired with another value that defines the
* size of the bucket; the number of possible values available.
* The {@link #getIncrementSize() incrementSize} serves this purpose. The
* naming here is meant more for consistency in that this value serves the
* same purpose as the increment supplied to the {@link PooledOptimizer}.
*
* The general algorithms used to determine the bucket are:
*
*
* As an example, consider a case with incrementSize of 20. Initially the
* database holds 1:
*
{@code upperLimit = (1 * 20) + 1 = 21}
*
{@code lowerLimit = 21 - 20 = 1}
*
* From there we increment the value from lowerLimit until we reach the
* upperLimit, at which point we would define a new bucket. The database
* now contains 2, though incrementSize remains unchanged:
*
{@code upperLimit = (2 * 20) + 1 = 41}
*
{@code lowerLimit = 41 - 20 = 21}
*
* And so on...
*
* Note, 'value' always (after init) holds the next value to return
*/
public static class HiLoOptimizer extends OptimizerSupport {
private IntegralDataTypeHolder lastSourceValue;
private IntegralDataTypeHolder upperLimit;
private IntegralDataTypeHolder value;
public HiLoOptimizer(Class returnClass, int incrementSize) {
super( returnClass, incrementSize );
if ( incrementSize < 1 )
throw new HibernateException( "increment size cannot be less than 1" );
if ( LOG.isTraceEnabled() ) {
LOG.tracev( "Creating hilo optimizer with [incrementSize={0}; returnClass={1}]", incrementSize, returnClass.getName() );
}
}
@Override
public synchronized Serializable generate(AccessCallback callback) {
if ( lastSourceValue == null ) {
// first call, so initialize ourselves. we need to read the database
// value and set up the 'bucket' boundaries
lastSourceValue = callback.getNextValue();
while ( lastSourceValue.lt( 1 ) ) {
lastSourceValue = callback.getNextValue();
}
// upperLimit defines the upper end of the bucket values
upperLimit = lastSourceValue.copy().multiplyBy( incrementSize ).increment();
// initialize value to the low end of the bucket
value = upperLimit.copy().subtract( incrementSize );
}
else if ( ! upperLimit.gt( value ) ) {
lastSourceValue = callback.getNextValue();
upperLimit = lastSourceValue.copy().multiplyBy( incrementSize ).increment();
}
return value.makeValueThenIncrement();
}
@Override
public IntegralDataTypeHolder getLastSourceValue() {
return lastSourceValue;
}
@Override
public boolean applyIncrementSizeToSourceValues() {
return false;
}
/**
* Getter for property 'lastValue'.
*
* Exposure intended for testing purposes.
*
* @return Value for property 'lastValue'.
*/
public IntegralDataTypeHolder getLastValue() {
return value.copy().decrement();
}
/**
* Getter for property 'upperLimit'.
*
* Exposure intended for testing purposes.
*
* @return Value for property 'upperLimit'.
*/
public IntegralDataTypeHolder getHiValue() {
return upperLimit;
}
}
public static class LegacyHiLoAlgorithmOptimizer extends OptimizerSupport {
private long maxLo;
private long lo;
private IntegralDataTypeHolder hi;
private IntegralDataTypeHolder lastSourceValue;
private IntegralDataTypeHolder value;
public LegacyHiLoAlgorithmOptimizer(Class returnClass, int incrementSize) {
super( returnClass, incrementSize );
if ( incrementSize < 1 )
throw new HibernateException( "increment size cannot be less than 1" );
if ( LOG.isTraceEnabled() ) {
LOG.tracev( "Creating hilo optimizer (legacy) with [incrementSize={0}; returnClass={1}]", incrementSize, returnClass.getName() );
}
maxLo = incrementSize;
lo = maxLo+1;
}
@Override
public synchronized Serializable generate(AccessCallback callback) {
if ( lo > maxLo ) {
lastSourceValue = callback.getNextValue();
lo = lastSourceValue.eq( 0 ) ? 1 : 0;
hi = lastSourceValue.copy().multiplyBy( maxLo+1 );
}
value = hi.copy().add( lo++ );
return value.makeValue();
}
@Override
public IntegralDataTypeHolder getLastSourceValue() {
return lastSourceValue.copy();
}
@Override
public boolean applyIncrementSizeToSourceValues() {
return false;
}
/**
* Getter for property 'lastValue'.
*
* Exposure intended for testing purposes.
*
* @return Value for property 'lastValue'.
*/
@SuppressWarnings( {"UnusedDeclaration"})
public IntegralDataTypeHolder getLastValue() {
return value;
}
}
/**
* Optimizer which uses a pool of values, storing the next low value of the
* range in the database.
*
* Note that this optimizer works essentially the same as the
* {@link HiLoOptimizer} except that here the bucket ranges are actually
* encoded into the database structures.
*
* Note if you prefer that the database value be interpreted as the bottom end of our current range,
* then use the {@link PooledLoOptimizer} strategy
*/
public static class PooledOptimizer extends OptimizerSupport implements InitialValueAwareOptimizer {
private IntegralDataTypeHolder hiValue;
private IntegralDataTypeHolder value;
private long initialValue = -1;
public PooledOptimizer(Class returnClass, int incrementSize) {
super( returnClass, incrementSize );
if ( incrementSize < 1 ) {
throw new HibernateException( "increment size cannot be less than 1" );
}
if ( LOG.isTraceEnabled() ) {
LOG.tracev( "Creating pooled optimizer with [incrementSize={0}; returnClass={1}]", incrementSize, returnClass.getName() );
}
}
@Override
public synchronized Serializable generate(AccessCallback callback) {
if ( hiValue == null ) {
value = callback.getNextValue();
// unfortunately not really safe to normalize this
// to 1 as an initial value like we do the others
// because we would not be able to control this if
// we are using a sequence...
if (value.lt(1)) LOG.pooledOptimizerReportedInitialValue(value);
// the call to obtain next-value just gave us the initialValue
if ( ( initialValue == -1 && value.lt( incrementSize ) ) || value.eq( initialValue ) ) {
hiValue = callback.getNextValue();
}
else {
hiValue = value;
value = hiValue.copy().subtract( incrementSize );
}
}
else if ( ! hiValue.gt( value ) ) {
hiValue = callback.getNextValue();
value = hiValue.copy().subtract( incrementSize );
}
return value.makeValueThenIncrement();
}
@Override
public IntegralDataTypeHolder getLastSourceValue() {
return hiValue;
}
@Override
public boolean applyIncrementSizeToSourceValues() {
return true;
}
/**
* Getter for property 'lastValue'.
*
* Exposure intended for testing purposes.
*
* @return Value for property 'lastValue'.
*/
public IntegralDataTypeHolder getLastValue() {
return value.copy().decrement();
}
@Override
public void injectInitialValue(long initialValue) {
this.initialValue = initialValue;
}
}
public static class PooledLoOptimizer extends OptimizerSupport {
private IntegralDataTypeHolder lastSourceValue; // last value read from db source
private IntegralDataTypeHolder value; // the current generator value
public PooledLoOptimizer(Class returnClass, int incrementSize) {
super( returnClass, incrementSize );
if ( incrementSize < 1 ) {
throw new HibernateException( "increment size cannot be less than 1" );
}
if ( LOG.isTraceEnabled() ) {
LOG.tracev( "Creating pooled optimizer (lo) with [incrementSize={0}; returnClass=]", incrementSize, returnClass.getName() );
}
}
@Override
public synchronized Serializable generate(AccessCallback callback) {
if ( lastSourceValue == null || ! value.lt( lastSourceValue.copy().add( incrementSize ) ) ) {
lastSourceValue = callback.getNextValue();
value = lastSourceValue.copy();
// handle cases where initial-value is less that one (hsqldb for instance).
while ( value.lt( 1 ) ) {
value.increment();
}
}
return value.makeValueThenIncrement();
}
@Override
public IntegralDataTypeHolder getLastSourceValue() {
return lastSourceValue;
}
@Override
public boolean applyIncrementSizeToSourceValues() {
return true;
}
}
/**
* @deprecated Use {@link StandardOptimizerDescriptor#getExternalName()} via {@link StandardOptimizerDescriptor#NONE}
*/
@Deprecated
@SuppressWarnings( {"UnusedDeclaration"})
public static final String NONE = StandardOptimizerDescriptor.NONE.getExternalName();
/**
* @deprecated Use {@link StandardOptimizerDescriptor#getExternalName()} via {@link StandardOptimizerDescriptor#HILO}
*/
@Deprecated
@SuppressWarnings( {"UnusedDeclaration"})
public static final String HILO = StandardOptimizerDescriptor.HILO.getExternalName();
/**
* @deprecated Use {@link StandardOptimizerDescriptor#getExternalName()} via {@link StandardOptimizerDescriptor#LEGACY_HILO}
*/
@Deprecated
@SuppressWarnings( {"UnusedDeclaration"})
public static final String LEGACY_HILO = "legacy-hilo";
/**
* @deprecated Use {@link StandardOptimizerDescriptor#getExternalName()} via {@link StandardOptimizerDescriptor#POOLED}
*/
@Deprecated
@SuppressWarnings( {"UnusedDeclaration"})
public static final String POOL = "pooled";
/**
* @deprecated Use {@link StandardOptimizerDescriptor#getExternalName()} via {@link StandardOptimizerDescriptor#POOLED_LO}
*/
@Deprecated
@SuppressWarnings( {"UnusedDeclaration"})
public static final String POOL_LO = "pooled-lo";
}
