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Code Issues Releases Wiki Activity

Don't use instanceof in a parse(IQ|PacketExtension)

Browse source 
Instead of using instanceof *every time* we parse an IQ or
PacketExtension, we now check the type of the Provider only once when
adding it.
This commit is contained in:
Florian Schmaus 2014-09-26 10:42:38 +02:00
parent 7977f119e8
commit 47dd63e6b2
2 changed files with 76 additions and 44 deletions
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78
smack-core/src/main/java/org/jivesoftware/smack/provider/ProviderManager.java
View file

@ -17,13 +17,15 @@
package org.jivesoftware.smack.provider;
import java.util.Collection;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.jivesoftware.smack.SmackConfiguration;
import org.jivesoftware.smack.packet.IQ;
import org.jivesoftware.smack.packet.PacketExtension;
import org.jxmpp.util.XmppStringUtils;
/**
@ -107,8 +109,10 @@ import org.jxmpp.util.XmppStringUtils;
*/
public final class ProviderManager {
private static final Map<String, Object> extensionProviders = new ConcurrentHashMap<String, Object>();
private static final Map<String, Object> iqProviders = new ConcurrentHashMap<String, Object>();
private static final Map<String, PacketExtensionProvider> extensionProviders = new ConcurrentHashMap<String, PacketExtensionProvider>();
private static final Map<String, IQProvider> iqProviders = new ConcurrentHashMap<String, IQProvider>();
private static final Map<String, Class<?>> extensionIntrospectionProviders = new ConcurrentHashMap<String, Class<?>>();
private static final Map<String, Class<?>> iqIntrospectionProviders = new ConcurrentHashMap<String, Class<?>>();
private static final Map<String, StreamFeatureProvider> streamFeatureProviders = new ConcurrentHashMap<String, StreamFeatureProvider>();
static {
@ -122,13 +126,13 @@ public final class ProviderManager {
public static void addLoader(ProviderLoader loader) {
if (loader.getIQProviderInfo() != null) {
for (IQProviderInfo info : loader.getIQProviderInfo()) {
iqProviders.put(getKey(info.getElementName(), info.getNamespace()), info.getProvider());
addIQProvider(info.getElementName(), info.getNamespace(), info.getProvider());
}
}
if (loader.getExtensionProviderInfo() != null) {
for (ExtensionProviderInfo info : loader.getExtensionProviderInfo()) {
extensionProviders.put(getKey(info.getElementName(), info.getNamespace()), info.getProvider());
addExtensionProvider(info.getElementName(), info.getNamespace(), info.getProvider());
}
}
}
@ -153,11 +157,16 @@ public final class ProviderManager {
* @param namespace the XML namespace.
* @return the IQ provider.
*/
public static Object getIQProvider(String elementName, String namespace) {
public static IQProvider getIQProvider(String elementName, String namespace) {
String key = getKey(elementName, namespace);
return iqProviders.get(key);
}
public static Class<?> getIQIntrospectionProvider(String elementName, String namespace) {
String key = getKey(elementName, namespace);
return iqIntrospectionProviders.get(key);
}
/**
* Returns an unmodifiable collection of all IQProvider instances. Each object
* in the collection will either be an IQProvider instance, or a Class object
@ -165,8 +174,11 @@ public final class ProviderManager {
*
* @return all IQProvider instances.
*/
public static Collection<Object> getIQProviders() {
return Collections.unmodifiableCollection(iqProviders.values());
public static List<Object> getIQProviders() {
List<Object> providers = new ArrayList<Object>(iqProviders.size() + iqIntrospectionProviders.size());
providers.addAll(iqProviders.values());
providers.addAll(iqIntrospectionProviders.values());
return Collections.unmodifiableList(providers);
}
/**
@ -181,14 +193,16 @@ public final class ProviderManager {
public static void addIQProvider(String elementName, String namespace,
Object provider)
{
if (!(provider instanceof IQProvider || (provider instanceof Class &&
IQ.class.isAssignableFrom((Class<?>)provider))))
{
// First remove existing providers
String key = removeIQProvider(elementName, namespace);
if (provider instanceof IQProvider) {
iqProviders.put(key, (IQProvider) provider);
} else if (provider instanceof Class && IQ.class.isAssignableFrom((Class<?>) provider)) {
iqIntrospectionProviders.put(key, (Class<?>) provider);
} else {
throw new IllegalArgumentException("Provider must be an IQProvider " +
"or a Class instance sublcassing IQ.");
"or a Class instance sublcassing IQ.");
}
String key = getKey(elementName, namespace);
iqProviders.put(key, provider);
}
/**
@ -198,10 +212,13 @@ public final class ProviderManager {
*
* @param elementName the XML element name.
* @param namespace the XML namespace.
* @return the key of the removed IQ Provider
*/
public static void removeIQProvider(String elementName, String namespace) {
public static String removeIQProvider(String elementName, String namespace) {
String key = getKey(elementName, namespace);
iqProviders.remove(key);
iqIntrospectionProviders.remove(key);
return key;
}
/**
@ -223,11 +240,16 @@ public final class ProviderManager {
* @param namespace namespace associated with extension provider.
* @return the extenion provider.
*/
public static Object getExtensionProvider(String elementName, String namespace) {
public static PacketExtensionProvider getExtensionProvider(String elementName, String namespace) {
String key = getKey(elementName, namespace);
return extensionProviders.get(key);
}
public static Class<?> getExtensionIntrospectionProvider(String elementName, String namespace) {
String key = getKey(elementName, namespace);
return extensionIntrospectionProviders.get(key);
}
/**
* Adds an extension provider with the specified element name and name space. The provider
* will override any providers loaded through the classpath. The provider must be either
@ -240,12 +262,16 @@ public final class ProviderManager {
public static void addExtensionProvider(String elementName, String namespace,
Object provider)
{
if (!(provider instanceof PacketExtensionProvider || provider instanceof Class)) {
// First remove existing providers
String key = removeExtensionProvider(elementName, namespace);
if (provider instanceof PacketExtensionProvider) {
extensionProviders.put(key, (PacketExtensionProvider) provider);
} else if (provider instanceof Class && PacketExtension.class.isAssignableFrom((Class<?>) provider)) {
extensionIntrospectionProviders.put(key, (Class<?>) provider);
} else {
throw new IllegalArgumentException("Provider must be a PacketExtensionProvider " +
"or a Class instance.");
"or a Class instance.");
}
String key = getKey(elementName, namespace);
extensionProviders.put(key, provider);
}
/**
@ -255,10 +281,13 @@ public final class ProviderManager {
*
* @param elementName the XML element name.
* @param namespace the XML namespace.
* @return the key of the removed packet extension provider
*/
public static void removeExtensionProvider(String elementName, String namespace) {
public static String removeExtensionProvider(String elementName, String namespace) {
String key = getKey(elementName, namespace);
extensionProviders.remove(key);
extensionIntrospectionProviders.remove(key);
return key;
}
/**
@ -268,8 +297,11 @@ public final class ProviderManager {
*
* @return all PacketExtensionProvider instances.
*/
public static Collection<Object> getExtensionProviders() {
return Collections.unmodifiableCollection(extensionProviders.values());
public static List<Object> getExtensionProviders() {
List<Object> providers = new ArrayList<Object>(extensionProviders.size() + extensionIntrospectionProviders.size());
providers.addAll(extensionProviders.values());
providers.addAll(extensionIntrospectionProviders.values());
return Collections.unmodifiableList(providers);
}
public static StreamFeatureProvider getStreamFeatureProvider(String elementName, String namespace) {

42
smack-core/src/main/java/org/jivesoftware/smack/util/PacketParserUtils.java
View file

@ -543,23 +543,25 @@ public class PacketParserUtils {
// Otherwise, see if there is a registered provider for
// this element name and namespace.
else {
Object provider = ProviderManager.getIQProvider(elementName, namespace);
IQProvider provider = ProviderManager.getIQProvider(elementName, namespace);
if (provider != null) {
if (provider instanceof IQProvider) {
iqPacket = ((IQProvider)provider).parseIQ(parser);
iqPacket =provider.parseIQ(parser);
} else {
Class<?> introspectionProvider = ProviderManager.getIQIntrospectionProvider(
elementName, namespace);
if (introspectionProvider != null) {
iqPacket = (IQ) PacketParserUtils.parseWithIntrospection(
elementName, introspectionProvider,
parser);
}
else if (provider instanceof Class) {
iqPacket = (IQ)PacketParserUtils.parseWithIntrospection(elementName,
(Class<?>)provider, parser);
// Only handle unknown IQs of type result. Types of 'get' and 'set' which are not understood
// have to be answered with an IQ error response. See the code a few lines below
else if (IQ.Type.result == type){
// No Provider found for the IQ stanza, parse it to an UnparsedIQ instance
// so that the content of the IQ can be examined later on
iqPacket = new UnparsedResultIQ(parseContent(parser));
}
}
// Only handle unknown IQs of type result. Types of 'get' and 'set' which are not understood
// have to be answered with an IQ error response. See the code a few lines below
else if (IQ.Type.result == type){
// No Provider found for the IQ stanza, parse it to an UnparsedIQ instance
// so that the content of the IQ can be examined later on
iqPacket = new UnparsedResultIQ(parseContent(parser));
}
}
}
else if (eventType == XmlPullParser.END_TAG) {
@ -885,15 +887,13 @@ public class PacketParserUtils {
public static PacketExtension parsePacketExtension(String elementName, String namespace,
XmlPullParser parser) throws Exception {
// See if a provider is registered to handle the extension.
Object provider = ProviderManager.getExtensionProvider(elementName, namespace);
PacketExtensionProvider provider = ProviderManager.getExtensionProvider(elementName, namespace);
if (provider != null) {
if (provider instanceof PacketExtensionProvider) {
return ((PacketExtensionProvider)provider).parseExtension(parser);
}
else if (provider instanceof Class) {
return (PacketExtension)parseWithIntrospection(
elementName, (Class<?>)provider, parser);
}
return provider.parseExtension(parser);
}
Class<?> introspectionProvider = ProviderManager.getExtensionIntrospectionProvider(elementName, namespace);
if (introspectionProvider != null) {
return (PacketExtension)parseWithIntrospection(elementName, introspectionProvider, parser);
}
// No providers registered, so use a default extension.
DefaultPacketExtension extension = new DefaultPacketExtension(elementName, namespace);