[ovirt-devel] Abusing injection and DB access

[Yevgeny Zaspitsky]

On Wed, Apr 5, 2017 at 11:17 PM, Roy Golan <rgolan at redhat.com> wrote:

>
>
> On Wed, Apr 5, 2017 at 9:06 PM Moti Asayag <masayag at redhat.com> wrote:
>
>> Hi All,
>>
>> ATM, there are 78 occurrences of "Injector.injectMembers(new
>> AuditLogableBase())" in ovirt-engine project, which their main purpose is
>> to ease the resolve of the placeholders of the audit log message while
>> logging an event.
>>
>> For instance AuditLogType.MAC_ADDRESS_IS_EXTERNAL is being used from
>> ImportVmCommandBase.java in the following way:
>>
>> private AuditLogableBase createExternalMacsAuditLog(VM vm, Set<String>
>> externalMacs) {
>>         AuditLogableBase logable = *Injector.injectMembers*(new
>> AuditLogableBase());
>>         logable.setVmId(vm.getId());
>>         logable.setCustomCommaSeparatedValues("MACAddr", externalMacs);
>>         return logable;
>>     }
>>
>> The entry in the properties file is:
>> MAC_ADDRESS_IS_EXTERNAL=VM ${*VmName*} has MAC address(es) ${MACAddr},
>> which is/are out of its MAC pool definitions.
>>
>> Therefore the only purpose of the injection is to allow the
>> AuditLogDirector to resolve the ${*VmName*} which is already known at
>> the time of creating the AuditLogableBase entry.
>>
>> The result is injecting the DAOs for the AuditLogableBase instance and
>> using the VM dao to retrieve the VM entry from the DB.
>> This is just a wastef of injection and DB access while both can be spared.
>>
>> This could have been easily replaced by one of the following:
>>
>>    - auditLogableBase.setVmName(vm.getName());
>>
>> - setVmName is protected so not usable as is
>
>>
>>    - auditLogableBase.addCustomValue("VmName", vm.getName());
>>
>> I prefer this, it is readable. and BTW it is fluent, it returns 'this' so
> use
>
>   AuditLogDirector(new AuditLogableBase(type)
>       .addCustomValue("VmName", vm.getName()));
>
>> Please pick up any occurrence from your domain and send a patch to
>> replace it where possible.
>> Thanks in advance,
>> Moti
>>
>
> +1
>
+1

>
> Frankly the fact that all the DAOs sets protected access in
> AuditLogableBase is a total abuse. Every command should declare its own
> deps.
>

+100 Can't agree more with declaring fine grained dependencies on each
bean/command.

>
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