api/src/main/java/com/cloud/ha/Investigator.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,
// 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.ha;

import com.cloud.host.Host;
import com.cloud.host.Status;
import com.cloud.utils.component.Adapter;
import com.cloud.vm.VirtualMachine;

public interface Investigator extends Adapter {
    /**
     * Returns if the vm is still alive.
     *
     * @param vm to work on.
     * @return true if vm is alive, otherwise false
     */
    boolean isVmAlive(VirtualMachine vm, Host host) throws UnknownVM;

    /**
     * Returns the agent status of the host.
     *
     * @param host
     * @return status of the host agent
     */
    Status getHostAgentStatus(Host host);

    class UnknownVM extends Exception {
        private static final long serialVersionUID = 1L;
    };
}