api/src/com/cloud/hypervisor/HypervisorGuru.java

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package com.cloud.hypervisor;

import com.cloud.agent.api.Command;
import com.cloud.agent.api.to.NicTO;
import com.cloud.agent.api.to.VirtualMachineTO;
import com.cloud.hypervisor.Hypervisor.HypervisorType;
import com.cloud.utils.component.Adapter;
import com.cloud.vm.NicProfile;
import com.cloud.vm.VirtualMachine;
import com.cloud.vm.VirtualMachineProfile;

public interface HypervisorGuru extends Adapter {
    HypervisorType getHypervisorType();

    /**
     * Convert from a virtual machine to the
     * virtual machine that the hypervisor expects.
     * @param vm
     * @return
     */
    <T extends VirtualMachine> VirtualMachineTO implement(VirtualMachineProfile<T> vm);

    /**
     * Give hypervisor guru opportunity to decide if certain command needs to be delegated to other host, mainly to secondary storage VM host
     * @param hostId original hypervisor host
     * @param cmd command that is going to be sent, hypervisor guru usually needs to register various context objects into the command object
     *
     * @return delegated host id if the command will be delegated
     */
    long getCommandHostDelegation(long hostId, Command cmd);

    /**
     *  @return true if VM can be migrated independently with CloudStack, and therefore CloudStack needs to track and reflect host change
     *  into CloudStack database, false if CloudStack enforces VM sync logic
     *
     */
    boolean trackVmHostChange();

    /**
     * @param profile
     * @return
     */
    NicTO toNicTO(NicProfile profile);
}