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package com.sun.enterprise.resource.naming;
import com.sun.appserv.connectors.internal.api.ConnectorConstants;
import com.sun.appserv.connectors.internal.api.ResourceNamingService;
import com.sun.appserv.connectors.internal.spi.BadConnectionEventListener;
import com.sun.enterprise.connectors.ConnectorRegistry;
import com.sun.enterprise.connectors.ConnectorRuntime;
import com.sun.enterprise.resource.DynamicallyReconfigurableResource;
import com.sun.logging.LogDomains;
import org.glassfish.resource.common.ResourceInfo;
import javax.resource.ResourceException;
import javax.resource.spi.RetryableUnavailableException;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Hashtable;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Invocation Handler used by proxy to connection-factory objects<br>
*
* @author Jagadish Ramu
*/
public class DynamicResourceReconfigurator implements InvocationHandler, DynamicallyReconfigurableResource {
private Object actualObject;
private ResourceInfo resourceInfo;
private boolean invalid = false;
protected final static Logger _logger = LogDomains.getLogger(DynamicResourceReconfigurator.class,LogDomains.RSR_LOGGER);
public DynamicResourceReconfigurator(Object actualObject, ResourceInfo resourceInfo){
this.actualObject = actualObject;
this.resourceInfo = resourceInfo;
}
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if (invalid) {
throw new ResourceException("Resource ["+ resourceInfo +"] instance is not valid any more");
}
if (method.getName().equals(DynamicallyReconfigurableResource.SET_DELEGATE_METHOD_NAME) && args.length == 1) {
setDelegate(args[0]);
} else if (method.getName().equals(DynamicallyReconfigurableResource.SET_INVALID_METHOD_NAME)
&& args.length == 0) {
setInvalid();
} else {
Map<DynamicallyReconfigurableResource, Boolean> proxies =
ConnectorRegistry.getInstance().getResourceFactories(resourceInfo);
Boolean status = proxies.get(this);
if (status == null || !status) {
debug("status is null or false: " + this);
Hashtable env = new Hashtable();
env.put(ConnectorConstants.DYNAMIC_RECONFIGURATION_PROXY_CALL, "TRUE");
//TODO ASR : resource-naming-service need to support "env" for module/app scope also
ResourceNamingService namingService = ConnectorRuntime.getRuntime().getResourceNamingService();
actualObject = namingService.lookup(resourceInfo, resourceInfo.getName(), env);
proxies.put(this, true);
debug("actualObject : " + actualObject);
}else{
debug("status is true: " + this);
}
debug("DynamicResourceReconfigurator : method : " + method.getName());
try {
return method.invoke(actualObject, args);
} catch (InvocationTargetException ite) {
debug("exception [ " + ite + " ] in method : " + method.getName());
if (ite.getCause() != null && ite.getCause().getCause() != null){
return retryIfNeeded(proxy, method, args, ite.getCause().getCause());
}else if(ite.getCause() != null){
return retryIfNeeded(proxy, method, args, ite.getCause());
}else{
throw ite;
}
}
}
return null;
}
/**
* retry the operation if it is of expected exception type.
* @param proxy Proxy object
* @param method Method to be invoked
* @param args arguments to method
* @param actualException ActualException thrown by the method
* @return Result of invoking the method
* @throws Throwable when calling the method fails.
*/
private Object retryIfNeeded(Object proxy, Method method, Object[] args, Throwable actualException)
throws Throwable {
if ((actualException instanceof RetryableUnavailableException)) {
RetryableUnavailableException rue =
(RetryableUnavailableException) actualException;
if (BadConnectionEventListener.POOL_RECONFIGURED_ERROR_CODE.equals(rue.getErrorCode())) {
debug(" DynamicResourceReconfigurator : retryable-exception in method, retrying : " +
method.getName());
return invoke(proxy, method, args);
}
}
throw actualException;
}
public void setDelegate(Object o) {
actualObject = o;
}
public void setInvalid() {
invalid = true;
}
private void debug(String message){
if(_logger.isLoggable(Level.FINEST)) {
_logger.finest("[DRC] : " + message);
}
}
}