/**
* 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 org.apache.zookeeper.server.quorum;
import org.apache.zookeeper.server.ServerStats;
public class QuorumStats extends ServerStats {
public interface Provider {
static public final String UNKNOWN_STATE="unknown";
static public final String LOOKING_STATE="leaderelection";
static public final String LEADING_STATE="leading";
static public final String FOLLOWING_STATE="following";
public String[] getQuorumPeers();
public String getServerState();
}
private Provider qprovider=null;
static public QuorumStats getInstance(){
ServerStats i=ServerStats.getInstance();
assert i==null || i instanceof QuorumStats;
return (QuorumStats)i;
}
static public void registerAsConcrete(){
assert getInstance()==null;
setInstance(new QuorumStats());
}
protected QuorumStats(){}
public void setStatsProvider(Provider newProvider){
qprovider=newProvider;
}
@Override
public String getServerState(){
return (qprovider!=null)?qprovider.getServerState():Provider.UNKNOWN_STATE;
}
public String[] getQuorumPeers(){
return (qprovider!=null)?qprovider.getQuorumPeers():new String[0];
}
@Override
public String toString(){
StringBuilder sb=new StringBuilder(super.toString());
String state=getServerState();
if(state.equals(Provider.LEADING_STATE)){
sb.append("Followers:");
for(String f: getQuorumPeers()){
sb.append(" ").append(f);
}
sb.append("\n");
}else if(state.equals(Provider.FOLLOWING_STATE)){
sb.append("Leader: ");
String[] ldr=getQuorumPeers();
if(ldr.length>0)
sb.append(ldr[0]);
else
sb.append("not connected");
sb.append("\n");
}
return sb.toString();
}
}