plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/KVMHAChecker.java

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// distributed with this work for additional information
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// to you under the Apache License, Version 2.0 (the
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// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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package com.cloud.hypervisor.kvm.resource;

import java.util.List;
import java.util.concurrent.Callable;
import java.util.stream.Collectors;


import com.cloud.agent.api.to.HostTO;

public class KVMHAChecker extends KVMHABase implements Callable<Boolean> {
    private List<HAStoragePool> storagePools;
    private HostTO host;
    private boolean reportFailureIfOneStorageIsDown;

    public KVMHAChecker(List<HAStoragePool> pools, HostTO host, boolean reportFailureIfOneStorageIsDown) {
        this.storagePools = pools;
        this.host = host;
        this.reportFailureIfOneStorageIsDown = reportFailureIfOneStorageIsDown;
    }

    /*
     * True means heartbeaing is on going, or we can't get it's status. False
     * means heartbeating is stopped definitely
     */
    @Override
    public Boolean checkingHeartBeat() {
        boolean validResult = false;

        String hostAndPools = String.format("host IP [%s] in pools [%s]", host.getPrivateNetwork().getIp(), storagePools.stream().map(pool -> pool.getPoolUUID()).collect(Collectors.joining(", ")));

        logger.debug(String.format("Checking heart beat with KVMHAChecker for %s", hostAndPools));

        for (HAStoragePool pool : storagePools) {
            validResult = pool.getPool().checkingHeartBeat(pool, host);
            if (reportFailureIfOneStorageIsDown && !validResult) {
                break;
            }
        }

        if (!validResult) {
            logger.warn(String.format("All checks with KVMHAChecker for %s considered it as dead. It may cause a shutdown of the host.", hostAndPools));
        }

        return validResult;
    }

    @Override
    public Boolean call() throws Exception {
        // logger.addAppender(new org.apache.log4j.ConsoleAppender(new
        // org.apache.log4j.PatternLayout(), "System.out"));
        return checkingHeartBeat();
    }
}