| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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.cloud.storage.download; |
| |
| import java.util.Date; |
| |
| import org.apache.log4j.Level; |
| import org.apache.log4j.Logger; |
| |
| import com.cloud.agent.api.storage.DownloadAnswer; |
| |
| public abstract class DownloadState { |
| public static enum DownloadEvent { |
| DOWNLOAD_ANSWER, ABANDON_DOWNLOAD, TIMEOUT_CHECK, DISCONNECT |
| }; |
| |
| protected static final Logger s_logger = Logger.getLogger(DownloadListener.class.getName()); |
| |
| private DownloadListener dl; |
| |
| public DownloadState(DownloadListener dl) { |
| this.dl = dl; |
| } |
| |
| protected DownloadListener getDownloadListener() { |
| return dl; |
| } |
| |
| public String handleEvent(DownloadEvent event, Object eventObj) { |
| if (s_logger.isTraceEnabled()) { |
| getDownloadListener().log("handleEvent, event type=" + event + ", curr state=" + getName(), Level.TRACE); |
| } |
| switch (event) { |
| case DOWNLOAD_ANSWER: |
| DownloadAnswer answer = (DownloadAnswer)eventObj; |
| return handleAnswer(answer); |
| case ABANDON_DOWNLOAD: |
| return handleAbort(); |
| case TIMEOUT_CHECK: |
| Date now = new Date(); |
| long update = now.getTime() - dl.getLastUpdated().getTime(); |
| return handleTimeout(update); |
| case DISCONNECT: |
| return handleDisconnect(); |
| } |
| return null; |
| } |
| |
| public void onEntry(String prevState, DownloadEvent event, Object evtObj) { |
| if (s_logger.isTraceEnabled()) { |
| getDownloadListener().log("onEntry, event type=" + event + ", curr state=" + getName(), Level.TRACE); |
| } |
| if (event == DownloadEvent.DOWNLOAD_ANSWER) { |
| getDownloadListener().callback((DownloadAnswer)evtObj); |
| } |
| } |
| |
| public void onExit() { |
| |
| } |
| |
| public abstract String handleTimeout(long updateMs); |
| |
| public abstract String handleAbort(); |
| |
| public abstract String handleDisconnect(); |
| |
| public abstract String handleAnswer(DownloadAnswer answer); |
| |
| public abstract String getName(); |
| |
| } |