org.jboss.ejb.client.NamingEJBClientInterceptor Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
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/*
* JBoss, Home of Professional Open Source.
* Copyright 2017 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed 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.jboss.ejb.client;
import static org.jboss.ejb.client.DiscoveryEJBClientInterceptor.addBlocklistedDestination;
import static org.jboss.ejb.client.DiscoveryEJBClientInterceptor.addInvocationBlocklistedDestination;
import static org.jboss.ejb.client.DiscoveryEJBClientInterceptor.isBlocklisted;
import static org.jboss.ejb.client.DiscoveryEJBClientInterceptor.shouldBlocklist;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.concurrent.ThreadLocalRandom;
import jakarta.ejb.NoSuchEJBException;
import org.jboss.ejb._private.Keys;
import org.jboss.ejb._private.Logs;
import org.jboss.ejb.client.annotation.ClientInterceptorPriority;
import org.wildfly.naming.client.NamingProvider;
import org.wildfly.naming.client.ProviderEnvironment;
/**
* Enterprise Beans client interceptor to discover a target location based on naming context information in the Enterprise Beans proxy.
*
* @author David M. Lloyd
*/
@ClientInterceptorPriority(NamingEJBClientInterceptor.PRIORITY)
public final class NamingEJBClientInterceptor implements EJBClientInterceptor {
/**
* This interceptor's priority.
*/
public static final int PRIORITY = ClientInterceptorPriority.JBOSS_AFTER + 50;
private static final AttachmentKey SKIP_MISSING_TARGET = new AttachmentKey<>();
public NamingEJBClientInterceptor() {
}
public void handleInvocation(final EJBClientInvocationContext context) throws Exception {
final NamingProvider namingProvider = context.getProxyAttachment(Keys.NAMING_PROVIDER_ATTACHMENT_KEY);
if (namingProvider != null) {
// make sure the naming provider is available to invocations
context.putAttachment(Keys.NAMING_PROVIDER_ATTACHMENT_KEY, namingProvider);
}
if (namingProvider == null || context.getDestination() != null || context.getLocator().getAffinity() != Affinity.NONE) {
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("NamingEJBClientInterceptor: calling handleInvocation: skipping missing target");
}
context.putAttachment(SKIP_MISSING_TARGET, Boolean.TRUE);
context.sendRequest();
} else {
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("NamingEJBClientInterceptor: calling handleInvocation: setting destination");
}
if (setDestination(context, namingProvider)) try {
context.sendRequest();
} catch (NoSuchEJBException | RequestSendFailedException e){
processMissingTarget(context, e);
throw e;
} else {
throw Logs.INVOCATION.noMoreDestinations();
}
}
}
public Object handleInvocationResult(final EJBClientInvocationContext context) throws Exception {
try {
return context.getResult();
} catch (NoSuchEJBException | RequestSendFailedException e){
if (context.getAttachment(SKIP_MISSING_TARGET) != Boolean.TRUE) {
processMissingTarget(context, e);
}
throw e;
} finally {
context.removeAttachment(SKIP_MISSING_TARGET);
}
}
public SessionID handleSessionCreation(final EJBSessionCreationInvocationContext context) throws Exception {
final NamingProvider namingProvider = context.getAttachment(Keys.NAMING_PROVIDER_ATTACHMENT_KEY);
if (namingProvider == null || context.getDestination() != null || context.getLocator().getAffinity() != Affinity.NONE) {
return context.proceed();
} else {
if (setDestination(context, namingProvider)) try {
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("NamingEJBClientInterceptor: called setNamingDestination: destination = %s", context.getDestination());
}
SessionID theSessionID = context.proceed();
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("NamingEJBClientInterceptor: returned from handleSessionCreation: sessionID = %s", theSessionID);
}
// we should setup session affinities here
if (context instanceof EJBSessionCreationInvocationContext) {
// this will convert strong=NONE to target or URI (if target not defined)
// this will also convert strong=Cluster and weak = NONE to strong=Cluster and weak = target or URI (if target not defined)
DiscoveryEJBClientInterceptor.setupSessionAffinities((EJBSessionCreationInvocationContext)context);
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("NamingEJBClientInterceptor: called DiscoveryEJBClientInterceptor.setupSessionAffinities");
}
}
return theSessionID;
} catch (NoSuchEJBException | RequestSendFailedException e) {
processMissingTarget(context, e);
throw e;
} else {
throw Logs.INVOCATION.noMoreDestinations();
}
}
}
private static boolean setDestination(final AbstractInvocationContext context, final NamingProvider namingProvider) {
if (namingProvider != null) {
final URI destination = context.getDestination();
if (destination == null) {
final EJBLocator locator = context.getLocator();
if (locator.getAffinity() == Affinity.NONE) {
final Affinity weakAffinity = context.getWeakAffinity();
if (weakAffinity == Affinity.NONE) {
return setNamingDestination(context, namingProvider);
}
}
}
}
return true;
}
static boolean setNamingDestination(final AbstractInvocationContext context, final NamingProvider namingProvider) {
final ProviderEnvironment providerEnvironment = namingProvider.getProviderEnvironment();
final List providerUris = providerEnvironment.getProviderUris();
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("NamingEJBClientInterceptor: calling setNamingDestination: providerURIs = %s, invocationContext type = %s", providerUris.toString(), context.getClass().getName());
}
// select the subset of providerURIs that agree with TransactionInterceptor's choices
List uris = findPreferredURIs(context, providerUris);
// if there are none, use all non-blocklisted providerURIs instead
if (uris == null) {
uris = new ArrayList<>(providerUris.size());
for (URI uri : providerUris) {
if (!isBlocklisted(context, uri)) {
uris.add(uri);
}
}
}
final int size = uris.size();
if (size == 0) {
// we can't discover the location; fail
return false;
} else if (size == 1) {
context.setDestination(uris.get(0));
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("NamingEJBClientInterceptor: setting destination: (size == 1), destination = %s", context.getDestination());
}
return true;
} else {
context.setDestination(uris.get(ThreadLocalRandom.current().nextInt(size)));
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("NamingEJBClientInterceptor: setting destination: (size > 1), destination = %s", context.getDestination());
}
}
if (context instanceof EJBSessionCreationInvocationContext) {
DiscoveryEJBClientInterceptor.setupSessionAffinities((EJBSessionCreationInvocationContext)context);
}
return true;
}
private static List findPreferredURIs(AbstractInvocationContext context, List uris) {
Collection attachment = context.getAttachment(TransactionInterceptor.PREFERRED_DESTINATIONS);
if (attachment == null) {
return null;
}
HashSet preferred = new HashSet<>(attachment);
List result = null;
for (URI check : uris) {
if (preferred.contains(check) && !isBlocklisted(context, check)) {
if (result == null) {
result = new ArrayList<>(preferred.size());
}
result.add(check);
}
}
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("NamingEJBClientInterceptor: computing preferred URIs: URIs = %s, preferred URIs = %s", uris, result);
}
return result;
}
private void processMissingTarget(final AbstractInvocationContext context, Exception cause) {
final URI destination = context.getDestination();
if (destination == null || context.getTargetAffinity() == Affinity.LOCAL) {
// some later interceptor cleared it out on us
return;
}
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("NamingEJBClientInterceptor: missing target, *** retrying ***: locator = %s", context.getLocator());
}
// Oops, we got some wrong information!
if(shouldBlocklist(cause)){
addBlocklistedDestination(destination);
} else {
addInvocationBlocklistedDestination(context, destination);
}
final EJBLocator locator = context.getLocator();
if (! (locator.getAffinity() instanceof ClusterAffinity)) {
// it *was* "none" affinity, but it has been relocated; locate it back again
context.setLocator(locator.withNewAffinity(Affinity.NONE));
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("NamingEJBClientInterceptor: resetting strong affinity = %s", context.getLocator().getAffinity());
}
}
// clear the weak affinity so that cluster invocations can be re-targeted.
context.setWeakAffinity(Affinity.NONE);
context.setTargetAffinity(null);
context.setDestination(null);
context.requestRetry();
}
}