org.apache.juneau.rest.client.RestCallInterceptor Maven / Gradle / Ivy

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package org.apache.juneau.rest.client;

/**
 * Used to intercept http connection responses to allow modification of that response before processing and for
 * listening for call lifecycle events.
 *
 * 
 * The {@link BasicRestCallInterceptor} is provided as an adapter class for implementing this interface.
 *
 * 

 * Note that the {@link RestClient} class itself implements this interface so you can achieve the same results by
 * overriding the methods on the client class as well.
 *
 * 
Example:
 * 
 * 	// Specialized client that adds a header to every request.
 * 	public class MyRestClient extends RestClient {
 * 		@Override
 * 		public void onInit(RestRequest req) {
 * 			req.header("Foo", "bar");
 * 		}
 * 	}
 *
 *	// Instantiate the client.
 *	MyRestClient client = RestClient
 *		.create()
 *		.json()
 *		.build(MyRestClient.class);
 * 
 *
 * See Also:

 * 	{@link RestClient.Builder#interceptors(Object...)}
 * 	
juneau-rest-client
 * 
 */
public interface RestCallInterceptor {

	/**
	 * Called immediately after {@link RestRequest} object is created and all headers/query/form-data has been
	 * copied from the client to the request object.
	 *
	 * @param req The HTTP request object.
	 * @throws Exception
	 * 	Any exception can be thrown.
	 * 	
If not a {@link RestCallException} or {@link RuntimeException}, will be wrapped in a {@link RestCallException}.
	 */
	void onInit(RestRequest req) throws Exception;

	/**
	 * Called immediately after an HTTP response has been received.
	 *
	 * @param req The HTTP request object.
	 * @param res The HTTP response object.
	 * @throws Exception
	 * 	Any exception can be thrown.
	 * 	
If not a {@link RestCallException} or {@link RuntimeException}, will be wrapped in a {@link RestCallException}.
	 */
	void onConnect(RestRequest req, RestResponse res) throws Exception;

	/**
	 * Called when the response body is consumed.
	 *
	 * @param req The request object.
	 * @param res The response object.
	 * @throws RestCallException Error occurred during call.
	 * @throws Exception
	 * 	Any exception can be thrown.
	 * 	
If not a {@link RestCallException} or {@link RuntimeException}, will be wrapped in a {@link RestCallException}.
	 */
	void onClose(RestRequest req, RestResponse res) throws Exception;
}