org.jboss.ejb.client.EJBLocator 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).
/*
* 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.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamField;
import java.io.Serializable;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.UndeclaredThrowableException;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Objects;
import javax.ejb.EJBHome;
import javax.ejb.EJBObject;
import org.jboss.ejb._private.Logs;
import org.wildfly.common.Assert;
/**
* An identifier for an Enterprise Bean proxy invocation target instance, suitable for use as a hash key or a serialized token.
*
* @param the interface type
*/
public abstract class EJBLocator implements Serializable {
private static final long serialVersionUID = -7306257085240447972L;
private static final ObjectStreamField[] serialPersistentFields = {
new ObjectStreamField("viewType", Class.class),
new ObjectStreamField("appName", String.class),
new ObjectStreamField("moduleName", String.class),
new ObjectStreamField("beanName", String.class),
new ObjectStreamField("distinctName", String.class),
new ObjectStreamField("affinity", Affinity.class),
new ObjectStreamField("identifier", EJBIdentifier.class), // may not be present (V3+ only)
};
private final Class viewType;
private final EJBIdentifier identifier;
private final Affinity affinity;
private int hashCode;
private EJBProxyInformation proxyInformation;
private static final Field viewTypeSetter;
private static final Field identifierSetter;
private static final Field affinitySetter;
static {
final Class clazz = EJBLocator.class;
try {
viewTypeSetter = clazz.getDeclaredField("viewType");
secureSetAccessible(viewTypeSetter, true);
identifierSetter = clazz.getDeclaredField("identifier");
secureSetAccessible(identifierSetter, true);
affinitySetter = clazz.getDeclaredField("affinity");
secureSetAccessible(affinitySetter, true);
} catch (NoSuchFieldException e) {
throw new NoSuchFieldError(e.getMessage());
}
}
EJBLocator(final Class viewType, final EJBIdentifier identifier, final Affinity affinity) {
Assert.checkNotNullParam("viewType", viewType);
Assert.checkNotNullParam("identifier", identifier);
Assert.checkNotNullParam("affinity", affinity);
this.viewType = viewType;
this.identifier = identifier;
this.affinity = affinity == null ? Affinity.NONE : affinity;
}
EJBLocator(final Class viewType, final String appName, final String moduleName, final String beanName, final String distinctName, final Affinity affinity) {
this(viewType, new EJBIdentifier(appName, moduleName, beanName, distinctName), affinity);
}
EJBLocator(final EJBLocator original, final Affinity newAffinity) {
this(Assert.checkNotNullParam("original", original).viewType, original.identifier, newAffinity);
}
/**
* Create a copy of this locator, but with the new given affinity.
*
* @param affinity the new affinity
* @return the new locator
*/
public abstract EJBLocator withNewAffinity(Affinity affinity);
/**
* Create a copy of this locator, but with the given stateful session ID. If this locator cannot be converted,
* an exception is thrown.
*
* @param sessionId the stateful session ID (must not be {@code null})
* @return the new locator (not {@code null})
*/
public StatefulEJBLocator withSession(SessionID sessionId) {
throw Logs.MAIN.cannotConvertToStateful(this);
}
/**
* Create a copy of this locator, but with the given affinity and stateful session ID. If this locator cannot be converted,
* an exception is thrown.
*
* @param sessionId the stateful session ID (must not be {@code null})
* @param affinity the new affinity (must not be {@code null})
* @return the new locator (not {@code null})
*/
public StatefulEJBLocator withSessionAndAffinity(SessionID sessionId, Affinity affinity) {
throw Logs.MAIN.cannotConvertToStateful(this);
}
/**
* Determine whether a {@link #narrowTo(Class)} operation would succeed.
*
* @param type the type to narrow to
* @return {@code true} if the narrow would succeed; {@code false} otherwise
*/
public boolean canNarrowTo(Class type) {
return type != null && type.isAssignableFrom(viewType);
}
/**
* Narrow this locator to the target type.
*
* @param type the target type class
* @param the target type
* @return this instance, narrowed to the given type
* @throws ClassCastException if the view type cannot be cast to the given type
*/
@SuppressWarnings("unchecked")
public EJBLocator narrowTo(Class type) {
if (type.isAssignableFrom(viewType)) {
return (EJBLocator) this;
}
throw new ClassCastException(type.toString());
}
/**
* Narrow this locator to the target type as a home locator.
*
* @param type the target type class
* @param the target type
* @return this instance, narrowed to the given type and cast as a home locator
* @throws ClassCastException if the view type cannot be cast to the given type or if this locator is not a home locator
*/
public EJBHomeLocator narrowAsHome(Class type) {
throw new ClassCastException(EJBHomeLocator.class.toString());
}
/**
* Narrow this locator to the target type as a entity locator.
*
* @param type the target type class
* @param the target type
* @return this instance, narrowed to the given type and cast as a entity locator
* @throws ClassCastException if the view type cannot be cast to the given type or if this locator is not a entity locator
*/
public EntityEJBLocator narrowAsEntity(Class type) {
throw new ClassCastException(EntityEJBLocator.class.toString());
}
/**
* Narrow this locator to the target type as a stateful locator.
*
* @param type the target type class
* @param the target type
* @return this instance, narrowed to the given type and cast as a stateful locator
* @throws ClassCastException if the view type cannot be cast to the given type or if this locator is not a stateful locator
*/
public StatefulEJBLocator narrowAsStateful(Class type) {
throw new ClassCastException(StatefulEJBLocator.class.toString());
}
/**
* Narrow this locator to the target type as a stateless locator.
*
* @param type the target type class
* @param the target type
* @return this instance, narrowed to the given type and cast as a stateless locator
* @throws ClassCastException if the view type cannot be cast to the given type or if this locator is not a stateless locator
*/
public StatelessEJBLocator narrowAsStateless(Class type) {
throw new ClassCastException(StatelessEJBLocator.class.toString());
}
/**
* Return this locator as a stateless locator, if it is one.
*
* @return this instance, cast as a stateless locator
* @throws ClassCastException if this locator is not a stateless locator
*/
public StatelessEJBLocator asStateless() {
throw new ClassCastException(StatefulEJBLocator.class.toString());
}
/**
* Return this locator as a stateful locator, if it is one.
*
* @return this instance, cast as a stateful locator
* @throws ClassCastException if this locator is not a stateful locator
*/
public StatefulEJBLocator asStateful() {
throw new ClassCastException(StatefulEJBLocator.class.toString());
}
/**
* Determine if this is a stateless locator. If so, calls to {@link #asStateless()} and {@link #narrowAsStateless(Class)}
* will generally succeed.
*
* @return {@code true} if this locator is stateless, {@code false} otherwise
*/
public boolean isStateless() {
return false;
}
/**
* Determine if this is a stateful locator. If so, calls to {@link #asStateful()} and {@link #narrowAsStateful(Class)}
* will generally succeed.
*
* @return {@code true} if this locator is stateful, {@code false} otherwise
*/
public boolean isStateful() {
return false;
}
/**
* Determine if this is an entity locator. If so, calls to {@link #narrowAsEntity(Class)} will generally succeed.
*
* @return {@code true} if this locator is an entity, {@code false} otherwise
*/
public boolean isEntity() {
return false;
}
/**
* Determine if this is a home locator. If so, calls to {@link #narrowAsHome(Class)} will generally succeed.
*
* @return {@code true} if this locator is a home, {@code false} otherwise
*/
public boolean isHome() {
return false;
}
/**
* Get the view type of this locator.
*
* @return the view type
*/
public Class getViewType() {
return viewType;
}
/**
* Get the application name.
*
* @return the application name
*/
public String getAppName() {
return identifier.getAppName();
}
/**
* Get the module name.
*
* @return the module name
*/
public String getModuleName() {
return identifier.getModuleName();
}
/**
* Get the Enterprise Beans bean name.
*
* @return the Enterprise Beans bean name
*/
public String getBeanName() {
return identifier.getBeanName();
}
/**
* Get the module distinct name.
*
* @return the module distinct name
*/
public String getDistinctName() {
return identifier.getDistinctName();
}
/**
* Get the locator affinity.
*
* @return the locator affinity
*/
public Affinity getAffinity() {
return affinity;
}
/**
* Get the Enterprise Beans identifier for this locator.
*
* @return the Enterprise Beans identifier
*/
public EJBIdentifier getIdentifier() {
return identifier;
}
/**
* Get the hash code for this instance.
*
* @return the hash code for this instance
*/
public final int hashCode() {
int hashCode = this.hashCode;
if (hashCode != 0) {
return hashCode;
}
hashCode = calculateHashCode();
return this.hashCode = hashCode == 0 ? hashCode | 0x8000_0000 : hashCode;
}
int calculateHashCode() {
return Objects.hashCode(viewType) + 13 * (Objects.hashCode(identifier) + 13 * Objects.hashCode(affinity));
}
/**
* 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 EJBLocator && equals((EJBLocator) other);
}
/**
* Get the proxy class for this locator.
*
* @return the proxy class
*/
public Class getProxyClass() {
return getProxyInformation().getProxyClass();
}
/**
* Get the proxy class constructor for this locator. A proxy class constructor accepts a single
* argument of type {@link InvocationHandler}.
*
* @return the proxy constructor
*/
public Constructor getProxyConstructor() {
return getProxyInformation().getProxyConstructor();
}
EJBProxyInformation getProxyInformation() {
final EJBProxyInformation i = proxyInformation;
return i != null ? i : (proxyInformation = EJBProxyInformation.forViewType(viewType));
}
/**
* Create a proxy instance using the cached proxy class.
*
* @param invocationHandler the invocation handler to use
* @return the proxy instance
*/
public T createProxyInstance(InvocationHandler invocationHandler) {
Assert.checkNotNullParam("invocationHandler", invocationHandler);
try {
return getProxyConstructor().newInstance(invocationHandler);
} catch (InstantiationException e) {
throw new InstantiationError(e.getMessage());
} catch (IllegalAccessException e) {
throw new IllegalAccessError(e.getMessage());
} catch (InvocationTargetException e) {
throw new UndeclaredThrowableException(e.getCause());
}
}
/**
* 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(EJBLocator other) {
return this == other || other != null && hashCode == other.hashCode
&& identifier.equals(other.identifier)
&& affinity.equals(other.affinity);
}
private void readObject(ObjectInputStream ois) throws ClassNotFoundException, IOException {
final ObjectInputStream.GetField fields = ois.readFields();
try {
final Object identifierObj = fields.get("identifier", null);
// if not null, the old *Name fields will share backreferences with the fields of the identifier at a cost of 4 bytes
final EJBIdentifier identifier = identifierObj != null ? (EJBIdentifier) identifierObj : new EJBIdentifier(
(String) fields.get("appName", null),
(String) fields.get("moduleName", null),
(String) fields.get("beanName", null),
(String) fields.get("distinctName", null)
);
viewTypeSetter.set(this, fields.get("viewType", null));
identifierSetter.set(this, identifier);
affinitySetter.set(this, fields.get("affinity", Affinity.NONE));
} catch ( IOException | RuntimeException | Error e) {
throw e;
} catch (Throwable t) {
throw new UndeclaredThrowableException(t);
}
}
private void writeObject(ObjectOutputStream oos) throws IOException {
final ObjectOutputStream.PutField fields = oos.putFields();
final EJBIdentifier identifier = this.identifier;
fields.put("identifier", identifier);
fields.put("viewType", viewType);
fields.put("affinity", affinity);
// now compat fields
fields.put("appName", identifier.getAppName());
fields.put("moduleName", identifier.getModuleName());
fields.put("beanName", identifier.getBeanName());
fields.put("distinctName", identifier.getDistinctName());
oos.writeFields();
}
@Override
public String toString() {
return String.format("%s for \"%s\", view is %s, affinity is %s", getClass().getSimpleName(), identifier, getViewType(), getAffinity());
}
private static void secureSetAccessible(final Field field, final boolean flag) {
if (System.getSecurityManager() == null) {
field.setAccessible(flag);
} else {
AccessController.doPrivileged((PrivilegedAction) () -> {
field.setAccessible(flag);
return null;
});
}
}
}