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Reference Implementation for JSR 236 - Concurrency Utilities for Java EE
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package org.glassfish.enterprise.concurrent.internal;
import java.io.Serializable;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import javax.enterprise.concurrent.ContextService;
import javax.enterprise.concurrent.ManagedTask;
import org.glassfish.enterprise.concurrent.ContextServiceImpl;
import org.glassfish.enterprise.concurrent.spi.ContextHandle;
import org.glassfish.enterprise.concurrent.spi.ContextSetupProvider;
import org.glassfish.enterprise.concurrent.spi.TransactionHandle;
import org.glassfish.enterprise.concurrent.spi.TransactionSetupProvider;
/**
* InvocationHandler used by ContextServiceImpl
*/
public class ContextProxyInvocationHandler implements InvocationHandler, Serializable {
static final long serialVersionUID = -2887560418884002777L;
final protected ContextSetupProvider contextSetupProvider;
protected ContextService contextService;
final protected ContextHandle capturedContextHandle;
final protected TransactionSetupProvider transactionSetupProvider;
final protected Object proxiedObject;
protected Map executionProperties;
public ContextProxyInvocationHandler(ContextServiceImpl contextService, Object proxiedObject,
Map executionProperties) {
this.contextSetupProvider = contextService.getContextSetupProvider();
this.proxiedObject = proxiedObject;
this.contextService = contextService;
this.transactionSetupProvider = contextService.getTransactionSetupProvider();
this.executionProperties = executionProperties;
this.capturedContextHandle =
contextSetupProvider.saveContext(contextService, executionProperties);
}
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
Object result = null;
Class methodDeclaringClass = method.getDeclaringClass();
if (methodDeclaringClass == java.lang.Object.class) {
// hashCode, equals, or toString method of java.lang.Object will
// have java.lang.Object as declaring class (per java doc in
// java.lang.reflect.Proxy). These methods would not be run
// under creator's context
result = method.invoke(proxiedObject, args);
}
else {
// for all other methods, invoke under creator's context
ContextHandle contextHandleForReset = contextSetupProvider.setup(capturedContextHandle);
// Ask TransactionSetupProvider to perform any transaction related
// setup before running the proxy. For example, suspend current
// transaction on current thread unless TRANSACTION property is set
// to USE_TRANSACTION_OF_EXECUTION_THREAD
TransactionHandle txHandle = null;
if (transactionSetupProvider != null) {
txHandle = transactionSetupProvider.beforeProxyMethod(getTransactionExecutionProperty());
}
try {
result = method.invoke(proxiedObject, args);
}
finally {
contextSetupProvider.reset(contextHandleForReset);
if (transactionSetupProvider != null) {
transactionSetupProvider.afterProxyMethod(txHandle, getTransactionExecutionProperty());
}
}
}
return result;
}
public Map getExecutionProperties() {
// returns a copy of the executionProperties
if (executionProperties == null) {
return null;
}
Map copy = new HashMap<>();
copy.putAll(executionProperties);
return copy;
}
public ContextService getContextService() {
return contextService;
}
protected String getTransactionExecutionProperty() {
if (executionProperties != null && executionProperties.get(ManagedTask.TRANSACTION) != null) {
return executionProperties.get(ManagedTask.TRANSACTION);
}
return ManagedTask.SUSPEND;
}
}