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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 javax.xml.stream.XMLStreamConstants.END_ELEMENT;
import static javax.xml.stream.XMLStreamConstants.START_ELEMENT;
import java.net.URI;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.ServiceConfigurationError;
import java.util.ServiceLoader;
import java.util.Set;
import org.jboss.ejb._private.Logs;
import org.jboss.ejb.client.legacy.LegacyPropertiesConfiguration;
import org.jboss.modules.Module;
import org.jboss.modules.ModuleLoadException;
import org.wildfly.client.config.ClientConfiguration;
import org.wildfly.client.config.ConfigXMLParseException;
import org.wildfly.client.config.ConfigurationXMLStreamReader;
import org.wildfly.common.Assert;
/**
* A one-time, configuration-based Enterprise Bean client context configurator.
*
* @author David M. Lloyd
* @author Joerg Baesner
*/
final class ConfigurationBasedEJBClientContextSelector {
private static final EJBClientContext configuredContext;
private static final String NS_EJB_CLIENT_3_0 = "urn:jboss:wildfly-client-ejb:3.0";
private static final String NS_EJB_CLIENT_3_1 = "urn:jboss:wildfly-client-ejb:3.1";
private static final String NS_EJB_CLIENT_3_2 = "urn:jboss:wildfly-client-ejb:3.2";
private static final String NS_INCORRECT = "urn:jboss:ejb-client:3.0";
private static final Set validNamespaces = new HashSet<>(Arrays.asList(NS_EJB_CLIENT_3_0, NS_EJB_CLIENT_3_1,
NS_EJB_CLIENT_3_2));
static {
configuredContext = loadConfiguration();
}
private ConfigurationBasedEJBClientContextSelector() {
}
private static EJBClientContext loadConfiguration() {
final ClientConfiguration clientConfiguration = ClientConfiguration.getInstance();
final ClassLoader classLoader = ConfigurationBasedEJBClientContextSelector.class.getClassLoader();
final EJBClientContext.Builder builder = new EJBClientContext.Builder();
loadTransportProviders(builder, classLoader);
if (clientConfiguration != null) try {
try (final ConfigurationXMLStreamReader streamReader = clientConfiguration.readConfiguration(validNamespaces)) {
parseEJBClientConfiguration(streamReader, builder);
}
} catch (ConfigXMLParseException e) {
throw new IllegalStateException(e);
}
LegacyPropertiesConfiguration.configure(builder);
return builder.build();
}
private static void parseEJBClientConfiguration(final ConfigurationXMLStreamReader streamReader, final EJBClientContext.Builder builder) throws ConfigXMLParseException {
if (streamReader.hasNext()) {
if (streamReader.nextTag() == START_ELEMENT) {
String namespaceURI = streamReader.getNamespaceURI();
// TODO: temporary
if (namespaceURI.equals(NS_INCORRECT)) {
throw new ConfigXMLParseException("The namespace \"" + NS_INCORRECT + "\" was incorrect; replace with \"" + NS_EJB_CLIENT_3_1 + "\"", streamReader);
}
if (! validNamespaces.contains(namespaceURI) || ! streamReader.getLocalName().equals("jboss-ejb-client")) {
throw streamReader.unexpectedElement();
}
parseEJBClientType(streamReader, builder);
return;
}
throw streamReader.unexpectedContent();
}
}
private static void parseEJBClientType(final ConfigurationXMLStreamReader streamReader, final EJBClientContext.Builder builder) throws ConfigXMLParseException {
if (streamReader.getAttributeCount() > 0) {
throw streamReader.unexpectedAttribute(0);
}
boolean gotInvocationTimeout = false;
boolean gotGlobalInterceptors = false;
boolean gotConnections = false;
boolean gotClusterNodeSelector = false;
boolean gotDeploymentNodeSelector = false;
boolean gotMaximumConnectedClusterNodes = false;
for (;;) {
final int next = streamReader.nextTag();
if (next == START_ELEMENT) {
String configuredNamespace = streamReader.getNamespaceURI();
if (! validNamespaces.contains(configuredNamespace)) {
throw streamReader.unexpectedElement();
}
final String localName = streamReader.getLocalName();
if (localName.equals("invocation-timeout") && ! gotInvocationTimeout && inValidNamespace(validNamespaces, configuredNamespace)) {
gotInvocationTimeout = true;
parseInvocationTimeoutType(streamReader, builder);
}
else if (localName.equals("global-interceptors") && ! gotGlobalInterceptors && inValidNamespace(validNamespaces, configuredNamespace)) {
gotGlobalInterceptors = true;
parseInterceptorsType(streamReader, builder);
}
else if (localName.equals("connections") && ! gotConnections && inValidNamespace(validNamespaces, configuredNamespace)) {
gotConnections = true;
parseConnectionsType(streamReader, builder);
}
else if(localName.equals("deployment-node-selector") && ! gotDeploymentNodeSelector
&& inValidNamespace(new HashSet<>(Arrays.asList(NS_EJB_CLIENT_3_1, NS_EJB_CLIENT_3_2)),
configuredNamespace)) {
gotDeploymentNodeSelector = true;
parseDeploymentNodeSelectorType(streamReader, builder);
}
else if(localName.equals("cluster-node-selector") && ! gotClusterNodeSelector
&& inValidNamespace(new HashSet<>(Arrays.asList(NS_EJB_CLIENT_3_1, NS_EJB_CLIENT_3_2)), configuredNamespace)) {
gotClusterNodeSelector = true;
parseClusterNodeSelectorType(streamReader, builder);
}
else if (localName.equals("max-allowed-connected-nodes") && ! gotMaximumConnectedClusterNodes
&& inValidNamespace(Collections.singleton(NS_EJB_CLIENT_3_2), configuredNamespace)) {
gotMaximumConnectedClusterNodes = true;
parseMaximumAllowedClusterNodesType(streamReader, builder);
}
else {
throw streamReader.unexpectedElement();
}
} else if (next == END_ELEMENT) {
return;
} else {
throw Assert.unreachableCode();
}
}
}
private static boolean inValidNamespace(Set validNamespaces, String configuredNamespace) {
return validNamespaces.contains(configuredNamespace);
}
private static void parseInvocationTimeoutType(final ConfigurationXMLStreamReader streamReader, final EJBClientContext.Builder builder) throws ConfigXMLParseException {
final int attributeCount = streamReader.getAttributeCount();
int timeout = -1 ;
for (int i = 0; i < attributeCount; i++) {
if (streamReader.getAttributeNamespace(i) != null && ! streamReader.getAttributeNamespace(i).isEmpty()) {
throw streamReader.unexpectedAttribute(i);
}
final String name = streamReader.getAttributeLocalName(i);
if (name.equals("seconds")) {
timeout = streamReader.getIntAttributeValueResolved(i);
} else {
throw streamReader.unexpectedAttribute(i);
}
// convert timeout in seconds to ms
long timeoutInMs = timeout == -1 ? timeout : timeout * 1000;
builder.setInvocationTimeout(timeoutInMs);
}
final int next = streamReader.nextTag();
if (next == END_ELEMENT) {
return;
}
throw streamReader.unexpectedElement();
}
private static void parseInterceptorsType(final ConfigurationXMLStreamReader streamReader, final EJBClientContext.Builder builder) throws ConfigXMLParseException {
if (streamReader.getAttributeCount() > 0) {
throw streamReader.unexpectedAttribute(0);
}
for (;;) {
final int next = streamReader.nextTag();
if (next == START_ELEMENT) {
if (! validNamespaces.contains(streamReader.getNamespaceURI()) || ! streamReader.getLocalName().equals("interceptor")) {
throw streamReader.unexpectedElement();
}
parseInterceptorType(streamReader, builder);
} else if (next == END_ELEMENT) {
return;
} else {
throw Assert.unreachableCode();
}
}
}
private static void parseInterceptorType(final ConfigurationXMLStreamReader streamReader, final EJBClientContext.Builder builder) throws ConfigXMLParseException {
final Class interceptorClass = parseClassType(streamReader, EJBClientInterceptor.class);
builder.addInterceptor(interceptorClass);
}
private static void parseClusterNodeSelectorType(final ConfigurationXMLStreamReader streamReader, final EJBClientContext.Builder builder) throws ConfigXMLParseException {
final Class clusterNodeSelectorClass = parseClassType(streamReader, ClusterNodeSelector.class);
try {
builder.setClusterNodeSelector(clusterNodeSelectorClass.newInstance());
} catch (InstantiationException | IllegalAccessException e) {
throw new ConfigXMLParseException(e);
}
}
private static void parseDeploymentNodeSelectorType(final ConfigurationXMLStreamReader streamReader, final EJBClientContext.Builder builder) throws ConfigXMLParseException {
final Class deploymentNodeSelectorClass = parseClassType(streamReader, DeploymentNodeSelector.class);
try {
builder.setDeploymentNodeSelector(deploymentNodeSelectorClass.newInstance());
} catch (InstantiationException | IllegalAccessException e) {
throw new ConfigXMLParseException(e);
}
}
private static Class parseClassType(final ConfigurationXMLStreamReader streamReader, Class interfaceToImplement) throws ConfigXMLParseException {
final int attributeCount = streamReader.getAttributeCount();
String className = null;
String moduleName = null;
for (int i = 0; i < attributeCount; i++) {
if (streamReader.getAttributeNamespace(i) != null && ! streamReader.getAttributeNamespace(i).isEmpty()) {
throw streamReader.unexpectedAttribute(i);
}
final String name = streamReader.getAttributeLocalName(i);
if (name.equals("class")) {
className = streamReader.getAttributeValueResolved(i);
} else if (name.equals("moduleName")) {
moduleName = streamReader.getAttributeValueResolved(i);
} else {
throw streamReader.unexpectedAttribute(i);
}
}
if (className == null) {
throw streamReader.missingRequiredAttribute(null, "class");
}
ClassLoader cl;
if (moduleName != null) {
try {
cl = ModuleLoadDelegate.loadModule(moduleName);
} catch (LinkageError e) {
throw Logs.MAIN.noJBossModules(streamReader);
}
} else {
cl = ConfigurationBasedEJBClientContextSelector.class.getClassLoader();
}
final Class clazz;
try {
clazz = Class.forName(className, false, cl).asSubclass(interfaceToImplement);
} catch (ClassNotFoundException | ClassCastException e) {
throw new ConfigXMLParseException(e);
}
final int next = streamReader.nextTag();
if (next == END_ELEMENT) {
return clazz;
}
throw streamReader.unexpectedElement();
}
static final class ModuleLoadDelegate {
static ClassLoader loadModule(String moduleName) throws ConfigXMLParseException {
try {
return Module.getModuleFromCallerModuleLoader(moduleName).getClassLoader();
} catch (ModuleLoadException e) {
throw new ConfigXMLParseException(e);
}
}
}
private static void parseConnectionsType(final ConfigurationXMLStreamReader streamReader, final EJBClientContext.Builder builder) throws ConfigXMLParseException {
if (streamReader.getAttributeCount() > 0) {
throw streamReader.unexpectedAttribute(0);
}
for (;;) {
final int next = streamReader.nextTag();
if (next == START_ELEMENT) {
if (! validNamespaces.contains(streamReader.getNamespaceURI())) {
throw streamReader.unexpectedElement();
}
final String localName = streamReader.getLocalName();
if (localName.equals("connection")) {
parseConnectionType(streamReader, builder);
} else {
throw streamReader.unexpectedElement();
}
} else if (next == END_ELEMENT) {
return;
} else {
throw Assert.unreachableCode();
}
}
}
private static void parseConnectionType(final ConfigurationXMLStreamReader streamReader, final EJBClientContext.Builder builder) throws ConfigXMLParseException {
URI uri = null;
final int attributeCount = streamReader.getAttributeCount();
for (int i = 0; i < attributeCount; i ++) {
if (streamReader.getAttributeNamespace(i) != null && ! streamReader.getAttributeNamespace(i).isEmpty() || ! streamReader.getAttributeLocalName(i).equals("uri") || uri != null) {
throw streamReader.unexpectedAttribute(i);
}
uri = streamReader.getURIAttributeValueResolved(i);
}
if (uri == null) {
throw streamReader.missingRequiredAttribute(null, "uri");
}
final int next = streamReader.nextTag();
if (next == START_ELEMENT) {
if (! validNamespaces.contains(streamReader.getNamespaceURI())) {
throw streamReader.unexpectedElement();
}
final String localName = streamReader.getLocalName();
if (localName.equals("interceptors")) {
// todo...
streamReader.skipContent();
}
} else if (next == END_ELEMENT) {
final EJBClientConnection.Builder connBuilder = new EJBClientConnection.Builder();
connBuilder.setDestination(uri);
builder.addClientConnection(connBuilder.build());
return;
} else {
throw Assert.unreachableCode();
}
}
private static void parseMaximumAllowedClusterNodesType(final ConfigurationXMLStreamReader streamReader, final EJBClientContext.Builder builder) throws ConfigXMLParseException {
final int attributeCount = streamReader.getAttributeCount();
int maximumConnectedClusterNodes;
for (int i = 0; i < attributeCount; i++) {
if (streamReader.getAttributeNamespace(i) != null && ! streamReader.getAttributeNamespace(i).isEmpty()) {
throw streamReader.unexpectedAttribute(i);
}
final String name = streamReader.getAttributeLocalName(i);
if (name.equals("nodes")) {
maximumConnectedClusterNodes = streamReader.getIntAttributeValueResolved(i);
} else {
throw streamReader.unexpectedAttribute(i);
}
builder.setMaximumConnectedClusterNodes(maximumConnectedClusterNodes);
}
final int next = streamReader.nextTag();
if (next == END_ELEMENT) {
return;
}
throw streamReader.unexpectedElement();
}
private static void loadTransportProviders(final EJBClientContext.Builder builder, final ClassLoader classLoader) {
final ServiceLoader serviceLoader = ServiceLoader.load(EJBTransportProvider.class, classLoader);
Iterator iterator = serviceLoader.iterator();
for (;;) try {
if (! iterator.hasNext()) break;
final EJBTransportProvider transportProvider = iterator.next();
builder.addTransportProvider(transportProvider);
} catch (ServiceConfigurationError ignored) {
Logs.MAIN.error("Failed to load service", ignored);
}
}
static EJBClientContext get() {
return configuredContext;
}
}
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