org.glassfish.jersey.server.model.AbstractJavaResourceMethodDispatcher Maven / Gradle / Ivy
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package org.glassfish.jersey.server.model;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.UndeclaredThrowableException;
import javax.ws.rs.core.Request;
import javax.ws.rs.core.Response;
import org.glassfish.jersey.internal.ProcessingException;
import org.glassfish.jersey.server.internal.process.MappableException;
import org.glassfish.jersey.server.spi.internal.ResourceMethodDispatcher;
/**
* Abstract resource method dispatcher that provides skeleton implementation of
* dispatching requests to a particular {@link Method Java method} using supplied
* {@link InvocationHandler Java method invocation handler}.
*
* @author Marek Potociar (marek.potociar at oracle.com)
*/
abstract class AbstractJavaResourceMethodDispatcher implements ResourceMethodDispatcher {
private final Method method;
private final InvocationHandler methodHandler;
/**
* Initialize common java resource method dispatcher structures.
*
* @param resourceMethod invocable resource class Java method.
* @param methodHandler method invocation handler.
*/
AbstractJavaResourceMethodDispatcher(Invocable resourceMethod, InvocationHandler methodHandler) {
this.method = resourceMethod.getHandlingMethod();
this.methodHandler = methodHandler;
}
@Override
public final Response dispatch(Object resource, Request request) throws ProcessingException {
// TODO measure time spent in invocation
return doDispatch(resource, request);
}
/**
* Dispatching functionality to be implemented by a concrete dispatcher
* implementation sub-class.
*
* @param resource resource class instance.
* @param request request to be dispatched.
* @return response for the dispatched request.
* @throws ProcessingException in case of a processing error.
* @see ResourceMethodDispatcher#dispatch(java.lang.Object, javax.ws.rs.core.Request)
*/
protected abstract Response doDispatch(Object resource, Request request) throws ProcessingException;
/**
* Use the underlying invocation handler to invoke the underlying Java method
* with the supplied input method argument values on a given resource instance.
*
* @param resource resource class instance.
* @param args input argument values for the invoked Java method.
* @return invocation result.
* @throws ProcessingException (possibly {@link MappableException mappable})
* container exception in case the invocation failed.
*/
final Object invoke(Object resource, Object... args) throws ProcessingException {
try {
return methodHandler.invoke(resource, method, args);
} catch (IllegalAccessException ex) {
throw new ProcessingException("Resource Java method invocation error.", ex);
} catch (InvocationTargetException ex) {
final Throwable cause = ex.getCause();
if (cause instanceof ProcessingException) {
throw (ProcessingException) cause;
}
// exception cause potentially mappable
throw new MappableException(cause);
} catch (UndeclaredThrowableException ex) {
throw new ProcessingException("Resource Java method invocation error.", ex);
} catch (ProcessingException ex) {
throw ex;
} catch (Exception ex) {
// exception potentially mappable
throw new MappableException(ex);
} catch (Throwable t) {
throw new ProcessingException(t);
}
}
@Override
public String toString() {
return method.toString();
}
}