/*
* Copyright 1999-2011 Alibaba Group.
*
* 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.alibaba.dubbo.container.page.pages;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import com.alibaba.dubbo.common.URL;
import com.alibaba.dubbo.common.extension.ExtensionLoader;
import com.alibaba.dubbo.common.status.Status;
import com.alibaba.dubbo.common.status.StatusChecker;
import com.alibaba.dubbo.common.status.support.StatusUtils;
import com.alibaba.dubbo.container.page.Menu;
import com.alibaba.dubbo.container.page.Page;
import com.alibaba.dubbo.container.page.PageHandler;
/**
* StatusPageHandler
*
* @author william.liangf
*/
@Menu(name = "Status", desc = "Show system status.", order = Integer.MAX_VALUE - 12000)
public class StatusPageHandler implements PageHandler {
public Page handle(URL url) {
List<List<String>> rows = new ArrayList<List<String>>();
Set<String> names = ExtensionLoader.getExtensionLoader(StatusChecker.class).getSupportedExtensions();
Map<String, Status> statuses = new HashMap<String, Status>();
for (String name : names) {
StatusChecker checker = ExtensionLoader.getExtensionLoader(StatusChecker.class).getExtension(name);
List<String> row = new ArrayList<String>();
row.add(name);
Status status = checker.check();
if (status != null && ! Status.Level.UNKNOWN.equals(status.getLevel())) {
statuses.put(name, status);
row.add(getLevelHtml(status.getLevel()));
row.add(status.getMessage());
rows.add(row);
}
}
Status status = StatusUtils.getSummaryStatus(statuses);
if ("status".equals(url.getPath())) {
return new Page("", "", "", status.getLevel().toString());
} else {
List<String> row = new ArrayList<String>();
row.add("summary");
row.add(getLevelHtml(status.getLevel()));
row.add("<a href=\"/status\" target=\"_blank\">summary</a>");
rows.add(row);
return new Page("Status (<a href=\"/status\" target=\"_blank\">summary</a>)", "Status", new String[] {"Name", "Status", "Description"}, rows);
}
}
private String getLevelHtml(Status.Level level) {
return "<font color=\"" + getLevelColor(level) + "\">" + level.name() + "</font>";
}
private String getLevelColor(Status.Level level) {
if (level == Status.Level.OK) {
return "green";
} else if (level == Status.Level.ERROR) {
return "red";
} else if (level == Status.Level.WARN) {
return "yellow";
}
return "gray";
}
}