server/src/main/java/com/cloud/ha/RecreatableFencer.java

// 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,
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// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.
package com.cloud.ha;

import java.util.List;

import javax.inject.Inject;

import org.springframework.stereotype.Component;

import org.apache.cloudstack.storage.datastore.db.PrimaryDataStoreDao;

import com.cloud.host.Host;
import com.cloud.storage.VolumeVO;
import com.cloud.storage.dao.VolumeDao;
import com.cloud.utils.component.AdapterBase;
import com.cloud.vm.VirtualMachine;

@Component
public class RecreatableFencer extends AdapterBase implements FenceBuilder {
    @Inject
    VolumeDao _volsDao;
    @Inject
    PrimaryDataStoreDao _poolDao;

    public RecreatableFencer() {
        super();
    }

    @Override
    public Boolean fenceOff(VirtualMachine vm, Host host) {
        VirtualMachine.Type type = vm.getType();
        if (type != VirtualMachine.Type.ConsoleProxy && type != VirtualMachine.Type.DomainRouter && type != VirtualMachine.Type.SecondaryStorageVm) {
            if (logger.isDebugEnabled()) {
                logger.debug("Don't know how to fence off " + type);
            }
            return null;
        }
        List<VolumeVO> vols = _volsDao.findByInstance(vm.getId());
        for (VolumeVO vol : vols) {
            if (!vol.isRecreatable()) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Unable to fence off volumes that are not recreatable: " + vol);
                }
                return null;
            }
            if (vol.getPoolType().isShared()) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Unable to fence off volumes that are shared: " + vol);
                }
                return null;
            }
        }
        return true;
    }
}