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HHH-8947 Optimize performance of ServiceRegistry for intense lookup, small contents and almost no writes

This commit is contained in:
Sanne Grinovero 2014-02-07 18:56:57 +00:00 committed by Brett Meyer
parent cb58f0bd68
commit 324d5536e4
3 changed files with 347 additions and 1 deletions
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2
hibernate-core/src/main/java/org/hibernate/service/internal/AbstractServiceRegistryImpl.java
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@ -63,7 +63,7 @@ public abstract class AbstractServiceRegistryImpl
private final ServiceRegistryImplementor parent;
private final boolean allowCrawling;
private final ConcurrentHashMap<Class,ServiceBinding> serviceBindingMap = CollectionHelper.concurrentMap( 20 );
private final ConcurrentServiceBinding<Class,ServiceBinding> serviceBindingMap = new ConcurrentServiceBinding<Class,ServiceBinding>();
private ConcurrentHashMap<Class,Class> roleXref;
// IMPL NOTE : the list used for ordered destruction. Cannot used map above because we need to

221
hibernate-core/src/main/java/org/hibernate/service/internal/ConcurrentServiceBinding.java Normal file
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@ -0,0 +1,221 @@
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2014, 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.service.internal;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Since Service lookup is a very hot operation and essentially it's a read only
* data structure, to achieve threadsafety we can use immutability.
* For our use case we just need reference equality, and the expectation is that a limited
* number of elements will be contained in this custom collection (<32).
* So the following structure is functionally equivalent to an Identity based ConcurrentMap,
* but heavily tuned for reads, at cost of structural reorganization at writes.
* The implementation is a binary tree basing the comparison order on the identityHashCode
* of each key.
*
* @author Sanne Grinovero
*/
public class ConcurrentServiceBinding<K,V> {
@SuppressWarnings({ "unchecked", "rawtypes" })
private static final Node EMPTY_LEAF = new Node( new Entry( 0, null, null ), null, null );
@SuppressWarnings("unchecked")
private volatile Node<K,V> treeRoot = EMPTY_LEAF;
@SuppressWarnings("unchecked")
public synchronized void clear() {
treeRoot = EMPTY_LEAF;
}
public synchronized void put(final K key, final V value) {
final int code = hashKey( key );
final Entry<K,V> newEntry = new Entry<K, V>( code, key, value );
final ArrayList<Entry<K, V>> list = convertToArrayList( treeRoot, key );
list.add( newEntry );
Collections.sort( list );
final int size = list.size();
@SuppressWarnings("unchecked")
Entry<K, V>[] array = list.toArray( new Entry[size] );
treeRoot = treeFromRange( array, 0, size );
}
private Node<K, V> treeFromRange(final Entry<K, V>[] array, final int minInclusive, final int maxExclusive) {
if ( minInclusive == maxExclusive ) {
return null;
}
//find the midpoint, rounding down to avoid the exclusion range:
int mid = ( minInclusive + maxExclusive ) / 2;
//shift to the right to make sure we won't have left children with the same hash:
while ( mid > minInclusive && array[mid].hash == array[mid-1].hash ) {
mid--;
}
return new Node( array[mid], treeFromRange( array, minInclusive, mid ), treeFromRange( array, mid + 1, maxExclusive ) );
}
public V get(final K key) {
final int hash = hashKey( key );
final Node<K,V> root = treeRoot;
return root.get( key, hash );
}
protected int hashKey(final K key) {
return System.identityHashCode( key );
}
public Iterable<V> values() {
@SuppressWarnings("rawtypes")
ArrayList<V> list = new ArrayList();
treeRoot.collectAllValuesInto( list );
return list;
}
private final ArrayList<Entry<K, V>> convertToArrayList(final Node<K, V> treeRoot, K exceptKey) {
@SuppressWarnings("rawtypes")
ArrayList<Entry<K, V>> list = new ArrayList();
if ( treeRoot != EMPTY_LEAF ) {
treeRoot.collectAllEntriesInto( list, exceptKey );
}
return list;
}
private static final class Entry<K,V> implements Comparable<Entry<K,V>> {
private final int hash;
private final K key;
private final V value;
Entry(int keyHashCode, K key, V value) {
this.hash = keyHashCode;
this.key = key;
this.value = value;
}
@Override
public int compareTo(Entry o) {
//Sorting by the identity hashcode
//Note: this class has a natural ordering that is inconsistent with equals.
return ( hash < o.hash ) ? -1 : ( (hash == o.hash) ? 0 : 1 );
}
@Override
public boolean equals(Object obj) {
//A ClassCastException is really not expected here,
//as it's an internal private class,
//so just let it happen as a form of assertion.
final Entry<K,V> other = (Entry<K,V>)obj;
//Reference equality on the key only!
return other.key == this.key;
}
@Override
public String toString() {
return "<" + key + ", " + value + ">";
}
}
private static final class Node<K,V> {
private final Entry<K,V> entry;
private final Node<K, V> left;
private final Node<K, V> right;
Node(Entry<K,V> entry, Node<K,V> left, Node<K,V> right) {
this.entry = entry;
this.left = left;
this.right = right;
}
public V get(final K key, final int hash) {
if ( entry.key == key ) {
return entry.value;
}
//Note that same-hashcode childs need to be on the right
//as we don't test for equality, nor want to chase both
//branches:
else if ( hash < this.entry.hash ) {
return left == null ? null : left.get( key, hash );
}
else {
return right == null ? null : right.get( key, hash );
}
}
public void collectAllEntriesInto(final List<Entry<K,V>> list, final K exceptKey) {
if ( entry != null && exceptKey != entry.key ) {
list.add( entry );
}
if ( left != null ) {
left.collectAllEntriesInto( list, exceptKey );
}
if ( right != null ) {
right.collectAllEntriesInto( list, exceptKey );
}
}
public void collectAllValuesInto(final List<V> list) {
if ( entry != null && entry.value != null ) {
list.add( entry.value );
}
if ( left != null ) {
left.collectAllValuesInto( list );
}
if ( right != null ) {
right.collectAllValuesInto( list );
}
}
/**
* Helper to visualize the tree via toString
*/
private void renderToStringBuilder(final StringBuilder sb, final int indent) {
sb.append( entry );
appendIndented( sb, indent, "L-> ", left );
appendIndented( sb, indent, "R-> ", right );
}
private void appendIndented(final StringBuilder sb, final int indent, final String label, Node<K, V> node) {
if ( node == null ) {
return;
}
sb.append( "\n" );
for ( int i = 0; i < indent; i++ ) {
sb.append( "\t" );
}
sb.append( label );
node.renderToStringBuilder( sb, indent + 1 );
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
renderToStringBuilder( sb, 0 );
return sb.toString();
}
}
}

125
hibernate-core/src/test/java/org/hibernate/service/internal/ConcurrentServiceBindingTest.java Normal file
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@ -0,0 +1,125 @@
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2014, 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.service.internal;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Set;
import org.hibernate.engine.jdbc.connections.internal.ConnectionProviderInitiator;
import org.hibernate.service.spi.ServiceBinding;
import org.hibernate.testing.TestForIssue;
import org.junit.Assert;
import org.junit.Test;
/**
* Unit Test for ConcurrentServiceBinding
*
* @author Sanne Grinovero
*/
@TestForIssue(jiraKey="HHH-8947")
public class ConcurrentServiceBindingTest {
private Class[] testTypes = new Class[]{ String.class, Integer.class, ServiceBinding.class, ConnectionProviderInitiator.class, HashMap.class,
ConcurrentServiceBindingTest.class, Long.class, Test.class, Set.class, HashSet.class };
@Test
public void normalImplementationTest() {
final ConcurrentServiceBinding<Class, String> binder = new ConcurrentServiceBinding<Class, String>();
verifyBehaviour( binder );
}
@Test
public void allKeysCollisions() {
final ConcurrentServiceBinding<Class, String> binder = new ConcurrentServiceBinding<Class, String>() {
protected int hashKey(final Class key) {
return 15;
}
};
verifyBehaviour( binder );
}
@Test
public void someKeysCollisions() {
final Set<Class> collidingClasses = new HashSet<Class>();
collidingClasses.add( String.class );
collidingClasses.add( ServiceBinding.class );
collidingClasses.add( ConnectionProviderInitiator.class );
final Set<Class> classedWhichHit = new HashSet<Class>();
final ConcurrentServiceBinding<Class, String> binder = new ConcurrentServiceBinding<Class, String>() {
protected int hashKey(final Class key) {
if ( collidingClasses.contains( key ) ) {
classedWhichHit.add( key );
return 15;
}
else {
return System.identityHashCode( key );
}
}
};
verifyBehaviour( binder );
Assert.assertEquals( 3, classedWhichHit.size() );//to verify the test is being applied as expected
}
private void verifyBehaviour(ConcurrentServiceBinding<Class, String> binder) {
isEmpty( binder );
HashSet<Class> addedTypes = new HashSet<Class>();
for ( Class newtype : testTypes ) {
addedTypes.add( newtype );
binder.put( newtype, newtype.toString() );
containsExactly( binder, addedTypes );
}
binder.clear();
isEmpty( binder );
}
private void containsExactly(ConcurrentServiceBinding<Class, String> binder, HashSet<Class> addedTypes) {
for ( Class knownType : addedTypes ) {
final String value = binder.get( knownType );
Assert.assertNotNull( value );
Assert.assertEquals( knownType.toString(), value );
int countElements = 0;
boolean present = false;
for ( String each : binder.values() ) {
countElements++;
if ( each.equals( knownType.toString() ) ) {
Assert.assertFalse( "should have been unique", present );
present = true;
}
}
Assert.assertEquals( addedTypes.size(), countElements );
Assert.assertTrue( present );
}
}
private void isEmpty(ConcurrentServiceBinding<Class, String> binder) {
for ( String value : binder.values() ) {
Assert.fail( "Expected it to be empty" );
}
for ( Class type : testTypes ) {
Assert.assertNull( binder.get( type ) );
}
}
}