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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 java.io.Serializable;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.rmi.RemoteException;
import java.security.PrivilegedAction;
import java.util.concurrent.Future;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Supplier;
import javax.ejb.EJBException;
import javax.ejb.EJBHome;
import javax.ejb.EJBObject;
import org.jboss.ejb._private.Logs;
import org.wildfly.common.Assert;
import org.wildfly.discovery.Discovery;
import org.wildfly.security.auth.client.AuthenticationContext;
import static java.security.AccessController.doPrivileged;
/**
* @param the proxy view type
* @author David M. Lloyd
*/
final class EJBInvocationHandler extends Attachable implements InvocationHandler, Serializable {
private static final long serialVersionUID = 946555285095057230L;
private static final Supplier DISCOVERY_SUPPLIER = doPrivileged((PrivilegedAction>) Discovery.getContextManager()::getPrivilegedSupplier);
private static final int MAX_RETRIES = SecurityUtils.getInteger(SystemProperties.MAX_RETRIES, 8);
private final transient boolean async;
private transient String toString;
private transient String toStringProxy;
private final AtomicReference> locatorRef;
private volatile Affinity weakAffinity = Affinity.NONE;
// -1 = use global value
private volatile long invocationTimeout = -1L;
/**
* The sticky authentication context supplier for this proxy.
*/
private volatile Supplier authenticationContextSupplier;
/**
* Construct a new instance.
*
* @param locator the initial Enterprise Beans locator (not {@code null})
* @param authenticationContextSupplier the sticky authentication context supplier, or {@code null} to always capture the current context
*/
EJBInvocationHandler(final EJBLocator locator, final Supplier authenticationContextSupplier) {
Assert.checkNotNullParam("locator", locator);
this.authenticationContextSupplier = authenticationContextSupplier;
this.locatorRef = new AtomicReference<>(locator);
async = false;
if (locator instanceof StatefulEJBLocator) {
// set the weak affinity to the node on which the session was created
setWeakAffinity(locator.getAffinity());
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("EJBInvocationHandler: setting weak affinity = %s", locator.getAffinity());
}
}
}
/**
* Construct a new asynchronous instance.
*
* @param other the synchronous invocation handler
*/
EJBInvocationHandler(final EJBInvocationHandler other) {
super(other);
final EJBLocator locator = other.locatorRef.get();
locatorRef = new AtomicReference<>(locator);
authenticationContextSupplier = other.authenticationContextSupplier;
async = true;
if (locator instanceof StatefulEJBLocator) {
// set the weak affinity to the node on which the session was created
setWeakAffinity(locator.getAffinity());
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("EJBInvocationHandler(constructor): setting weak affinity = %s", locator.getAffinity());
}
}
}
public Object invoke(final Object rawProxy, final Method method, final Object... args) throws Exception {
final T proxy = locatorRef.get().getViewType().cast(rawProxy);
final EJBProxyInformation.ProxyMethodInfo methodInfo = locatorRef.get().getProxyInformation().getProxyMethodInfo(method);
return invoke(proxy, methodInfo, args);
}
EJBProxyInformation.ProxyMethodInfo getProxyMethodInfo(EJBMethodLocator methodLocator) {
return locatorRef.get().getProxyInformation().getProxyMethodInfo(methodLocator);
}
Object invoke(final Object proxy, final EJBProxyInformation.ProxyMethodInfo methodInfo, final Object... args) throws Exception {
final Method method = methodInfo.getMethod();
switch (methodInfo.getMethodType()) {
case EJBProxyInformation.MT_EQUALS:
case EJBProxyInformation.MT_IS_IDENTICAL: {
assert args.length == 1; // checked by EJBProxyInformation
if (args[0] instanceof Proxy) {
final InvocationHandler handler = Proxy.getInvocationHandler(args[0]);
if (handler instanceof EJBInvocationHandler) {
return Boolean.valueOf(equals(handler));
}
}
return Boolean.FALSE;
}
case EJBProxyInformation.MT_HASH_CODE: {
// TODO: cache instance?
return Integer.valueOf(locatorRef.get().hashCode());
}
case EJBProxyInformation.MT_TO_STRING: {
final String s = toStringProxy;
return s != null ? s : (toStringProxy = String.format("Proxy for remote EJB %s", locatorRef.get()));
}
case EJBProxyInformation.MT_GET_PRIMARY_KEY: {
if (locatorRef.get().isEntity()) {
return locatorRef.get().narrowAsEntity(EJBObject.class).getPrimaryKey();
}
throw new RemoteException("Cannot invoke getPrimaryKey() on " + proxy);
}
case EJBProxyInformation.MT_GET_HANDLE: {
// TODO: cache instance
return EJBHandle.create(locatorRef.get().narrowTo(EJBObject.class));
}
case EJBProxyInformation.MT_GET_HOME_HANDLE: {
if (locatorRef.get() instanceof EJBHomeLocator) {
// TODO: cache instance
return EJBHomeHandle.create(locatorRef.get().narrowAsHome(EJBHome.class));
}
throw new RemoteException("Cannot invoke getHomeHandle() on " + proxy);
}
}
// otherwise it's a business method
assert methodInfo.getMethodType() == EJBProxyInformation.MT_BUSINESS;
final EJBClientContext clientContext = EJBClientContext.getCurrent();
final Discovery discoveryContext = DISCOVERY_SUPPLIER.get();
if (Logs.INVOCATION.isDebugEnabled()) {
Logs.INVOCATION.debugf("Calling invoke(module = %s, strong affinity = %s, weak affinity = %s): ", locatorRef.get().getIdentifier(), locatorRef.get().getAffinity(), weakAffinity);
}
final EJBClientInvocationContext invocationContext = new EJBClientInvocationContext(this, clientContext, proxy, args, methodInfo, MAX_RETRIES, authenticationContextSupplier, discoveryContext);
invocationContext.setLocator(locatorRef.get());
invocationContext.setBlockingCaller(true);
invocationContext.setWeakAffinity(getWeakAffinity());
try {
// send the request
invocationContext.sendRequestInitial();
if (! async && ! methodInfo.isClientAsync()) {
// wait for invocation to complete
return invocationContext.awaitResponse();
}
// proceed asynchronously
invocationContext.setBlockingCaller(false);
// force async...
if (method.getReturnType() == Future.class) {
return invocationContext.getFutureResponse();
} else if (method.getReturnType() == void.class) {
invocationContext.setDiscardResult();
// Void return
return null;
} else {
// wrap return always
EJBClient.setFutureResult(invocationContext.getFutureResponse());
return null;
}
} catch (RuntimeException e) {
throw e;
} catch (Exception e) {
boolean remoteException = false;
for (Class exception : method.getExceptionTypes()) {
if (exception.isAssignableFrom(e.getClass())) {
throw e;
} else if (RemoteException.class.equals(exception)) {
remoteException = true;
}
}
if (remoteException) {
throw new RemoteException("Error", e);
}
throw new EJBException(e);
}
}
void setWeakAffinity(Affinity newWeakAffinity) {
weakAffinity = newWeakAffinity;
}
Affinity getWeakAffinity() {
return weakAffinity;
}
@SuppressWarnings("unchecked")
static EJBInvocationHandler forProxy(T proxy) {
InvocationHandler handler = Proxy.getInvocationHandler(proxy);
if (handler instanceof EJBInvocationHandler) {
return (EJBInvocationHandler) handler;
}
throw Logs.MAIN.proxyNotOurs(proxy, EJBClient.class.getName());
}
@SuppressWarnings("unused")
protected Object writeReplace() {
return new SerializedEJBInvocationHandler(locatorRef.get(), async);
}
EJBInvocationHandler getAsyncHandler() {
return async ? this : new EJBInvocationHandler(this);
}
boolean isAsyncHandler() {
return this.async;
}
EJBLocator getLocator() {
return locatorRef.get();
}
/**
* Determine whether this object is equal to another.
*
* @param other the other object
* @return {@code true} if they are equal, {@code false} otherwise
*/
public boolean equals(Object other) {
return other instanceof EJBInvocationHandler && equals((EJBInvocationHandler)other);
}
/**
* Determine whether this object is equal to another.
*
* @param other the other object
* @return {@code true} if they are equal, {@code false} otherwise
*/
public boolean equals(InvocationHandler other) {
return other instanceof EJBInvocationHandler && equals((EJBInvocationHandler)other);
}
/**
* Determine whether this object is equal to another.
*
* @param other the other object
* @return {@code true} if they are equal, {@code false} otherwise
*/
public boolean equals(EJBInvocationHandler other) {
return this == other || other != null && locatorRef.get().equals(other.locatorRef.get()) && async == other.async;
}
/**
* Get the hash code of this handler.
*
* @return the hash code of this handler
*/
public int hashCode() {
int hc = locatorRef.get().hashCode();
if (async) hc ++;
return hc;
}
public String toString() {
final String s = toString;
return s != null ? s : (toString = String.format("Proxy invocation handler for %s", locatorRef.get()));
}
void setStrongAffinity(final Affinity newAffinity) {
final AtomicReference> locatorRef = this.locatorRef;
EJBLocator oldVal, newVal;
do {
oldVal = locatorRef.get();
if (oldVal.getAffinity().equals(newAffinity)) {
return;
}
newVal = oldVal.withNewAffinity(newAffinity);
} while (! locatorRef.compareAndSet(oldVal, newVal));
}
void setSessionID(final SessionID sessionID) {
final AtomicReference> locatorRef = this.locatorRef;
EJBLocator oldVal, newVal;
do {
oldVal = locatorRef.get();
if (oldVal.isStateful()) {
if (oldVal.asStateful().getSessionId().equals(sessionID)) {
// harmless/idempotent
return;
}
throw Logs.MAIN.ejbIsAlreadyStateful();
}
newVal = oldVal.withSession(sessionID);
} while (! locatorRef.compareAndSet(oldVal, newVal));
}
long getInvocationTimeout() {
return invocationTimeout;
}
void setInvocationTimeout(final long invocationTimeout) {
this.invocationTimeout = invocationTimeout;
}
boolean compareAndSetStrongAffinity(final Affinity expectedAffinity, final Affinity newAffinity) {
Assert.checkNotNullParam("expectedAffinity", expectedAffinity);
Assert.checkNotNullParam("newAffinity", newAffinity);
final AtomicReference> locatorRef = this.locatorRef;
EJBLocator oldVal = locatorRef.get();
if (! oldVal.getAffinity().equals(expectedAffinity)) {
return false;
}
EJBLocator newVal = oldVal.withNewAffinity(newAffinity);
return locatorRef.compareAndSet(oldVal, newVal);
}
}
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