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Client library for EJB applications working against Wildfly - Java EE Variant
/*
* 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 javax.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();
}
}
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