Copyright 2014 Netflix, Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
/**
 * Copyright 2014 Netflix, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.netflix.config;

The listener to be called upon when AbstractPollingScheduler completes a polling. 
Author:
awang/**
 * The listener to be called upon when {@link AbstractPollingScheduler} completes a polling.
 * 
 * @author awang
 *
 */
public interface PollListener {

    enum EventType {
        POLL_SUCCESS, POLL_FAILURE, POLL_BEGIN;
    }
    
This method is called when the listener is invoked after a polling.
Params:
eventType – type of the event
lastResult – the last poll result, null if the poll fails or there is no result
exception – any Throwable caught in the last poll, null if the poll is successful/**
     * This method is called when the listener is invoked after a polling.
     * 
     * @param eventType type of the event
     * @param lastResult the last poll result, null if the poll fails or there is no result 
     * @param exception any Throwable caught in the last poll, null if the poll is successful
     */
    void handleEvent(EventType eventType, PollResult lastResult, Throwable exception);
}