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Reference Implementation for JSR 236 - Concurrency Utilities for Java EE
/*
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* and Distribution License("CDDL") (collectively, the "License"). You
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* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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package org.glassfish.enterprise.concurrent;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;
import java.util.Enumeration;
import java.util.Map;
import javax.enterprise.concurrent.ContextService;
import org.glassfish.enterprise.concurrent.internal.ContextProxyInvocationHandler;
import org.glassfish.enterprise.concurrent.spi.ContextSetupProvider;
import org.glassfish.enterprise.concurrent.spi.TransactionSetupProvider;
/**
* Implementation of ContextService interface
*/
public class ContextServiceImpl implements ContextService {
protected final ContextSetupProvider contextSetupProvider;
protected final TransactionSetupProvider transactionSetupProvider;
protected final String name;
final private static String INVALID_PROXY =
"contextObject is not a valid contextual object proxy created with the createContextualProxy method";
final private static String NULL_CONTEXTPROPERTIES =
"contextProperties cannot be null";
final private static String NULL_INSTANCE =
"instance cannot be null";
final private static String NO_INTERFACES =
"No interfaces is provided in the method argument";
final private static String CLASS_DOES_NOT_IMPLEMENT_INTERFACES =
"Class does not implement at least one of the provided interfaces";
final private static String DIFFERENT_CONTEXTSERVICE =
"Proxy is created by a different ContextService object";
public ContextServiceImpl(String name, ContextSetupProvider contextSetupProvider) {
this(name, contextSetupProvider, null);
}
public ContextServiceImpl(String name, ContextSetupProvider contextSetupProvider,
TransactionSetupProvider transactionSetupProvider) {
this.name = name;
this.contextSetupProvider = contextSetupProvider;
this.transactionSetupProvider = transactionSetupProvider;
}
public String getName() {
return name;
}
public ContextSetupProvider getContextSetupProvider() {
return contextSetupProvider;
}
public TransactionSetupProvider getTransactionSetupProvider() {
return transactionSetupProvider;
}
@Override
public Object createContextualProxy(Object instance, Class... interfaces) {
return createContextualProxy(instance, null, interfaces);
}
@Override
public Object createContextualProxy(Object instance, Map executionProperties, Class... interfaces) {
if (instance == null) {
throw new IllegalArgumentException(NULL_INSTANCE);
}
if (interfaces == null || interfaces.length == 0) {
throw new IllegalArgumentException(NO_INTERFACES);
}
Class instanceClass = instance.getClass();
for (Class thisInterface: interfaces) {
if (! thisInterface.isAssignableFrom(instanceClass)) {
throw new IllegalArgumentException(CLASS_DOES_NOT_IMPLEMENT_INTERFACES);
}
}
ContextProxyInvocationHandler handler = new ContextProxyInvocationHandler(this, instance, executionProperties);
Object proxy = Proxy.newProxyInstance(instance.getClass().getClassLoader(), interfaces, handler);
return proxy;
}
@Override
public T createContextualProxy(T instance, Class intf) {
return createContextualProxy(instance, null, intf);
}
@Override
public T createContextualProxy(T instance, Map executionProperties, Class intf) {
if (instance == null) {
throw new IllegalArgumentException(NULL_INSTANCE);
}
if (intf == null) {
throw new IllegalArgumentException(NO_INTERFACES);
}
ContextProxyInvocationHandler handler = new ContextProxyInvocationHandler(this, instance, executionProperties);
Object proxy = Proxy.newProxyInstance(instance.getClass().getClassLoader(), new Class[]{intf}, handler);
return (T) proxy;
}
@Override
public Map getExecutionProperties(Object contextObject) {
ContextProxyInvocationHandler handler = verifyHandler(contextObject);
return handler.getExecutionProperties();
}
protected void verifyStringValue(Enumeration e) throws ClassCastException {
while (e.hasMoreElements()) {
String value = (String)e.nextElement();
}
}
protected ContextProxyInvocationHandler verifyHandler(Object contextObject) {
InvocationHandler handler = Proxy.getInvocationHandler(contextObject);
if (handler instanceof ContextProxyInvocationHandler) {
ContextProxyInvocationHandler cpih = (ContextProxyInvocationHandler) handler;
if (cpih.getContextService() != this) {
throw new IllegalArgumentException(DIFFERENT_CONTEXTSERVICE);
}
return cpih;
}
throw new IllegalArgumentException(INVALID_PROXY);
}
}