- Devel - oVirt List Archives

[Engine-devel] New patches for IBM POWER support
by Leonardo Bianconi 19 Aug '13

19 Aug '13

--_000_50EB20226B72D6419356FC320AB62B871917274FSERV070corpeldo_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi everyone! This is the dependency tree of the patches (along with their IDs on gerrit)= that will enable IBM POWER support for the oVirt engine (more patches will= be submitted later): 17853 - core: Add POWER 7 to the CPU list 16700 - core, engine, webadmin: Initial support for alterna= tive architectures 18220 - core: New OS for IBM POWER support 17855 - core: Architecture r= elated queries 18226 - core= , engine, webadmin: Cluster and architecture related changes = 18227 - core, webadmin, engine: Added architecture support for VM and T= emplate 17885 - webadmin: Show only = supported displays 17964 - core, webadmin: Show= only supported disk interfaces 17972 - webadmin: Show only = compatible OSes 18221 - core, webadmin: Show= only supported watchdogs 18227 - core, webadmin, engi= ne: Added architecture support for VM and Template 18150 - engine: Display type validation 18042 - engine: Vnic interface validation We divided the previous patchset into smaller patches with specific feature= s, in order to enhance the review process. We avoided modifying the change = #16700 too much, because the reviewers had already started giving their fee= dback on it. Looking at the tree, the other patches are highly dependent on changes #178= 53/#16700/#1822, and the change #16700 is the largest one. If there is some= thing to do to help the review process, please, let us know. Regards, Leonardo Bianconi/Vitor de Lima/Gustavo Pedrosa --_000_50EB20226B72D6419356FC320AB62B871917274FSERV070corpeldo_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable <html xmlns:v=3D"urn:schemas-microsoft-com:vml" xmlns:o=3D"urn:schemas-micr= osoft-com:office:office" xmlns:w=3D"urn:schemas-microsoft-com:office:word" = xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" xmlns=3D"http:= //www.w3.org/TR/REC-html40"> <head> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"= > <meta name=3D"Generator" content=3D"Microsoft Word 14 (filtered medium)"> <style></style> </head> <body lang=3D"PT-BR" link=3D"blue" vlink=3D"purple"> <div class=3D"WordSection1"> Hi everyone!<o:p></o:p><= /p> <o:p> </o:p> This is the dependency tree of = the patches (along with their IDs on gerrit) that will enable IBM POWER sup= port for the oVirt engine (more patches will be submitted later):<o:p></o:p= > <o:p> </o:p> 17853 - core: Add POWER 7 to th= e CPU list<o:p></o:p>      &= nbsp;          16700 - core, e= ngine, webadmin: Initial support for alternative architectures<o:p></o:p></= span>      &= nbsp;           &nbs= p;             = 18220 - core: New OS for IBM POWER support<o:p></o:p>      &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;    17855 - core: Architecture related queries<o:p></o:p><= /span>      &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;             =        18226 - core, engine, webadmin: C= luster and architecture related changes<o:p></o:p>      &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;           18227 - core= , webadmin, engine: Added architecture support for VM and Template<o:p></o:= p>      &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;    17885 - webadmin: Show only supported displays<o:p></o= :p>      &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;    17964 - core, webadmin: Show only supported disk inter= faces<o:p></o:p>      &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;    17972 - webadmin: Show only compatible OSes<o:p></o:p>=      &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;    18221 - core, webadmin: Show only supported watchdogs<= o:p></o:p>      &= nbsp;           &nbs= p;            &= nbsp;           &nbs= p;    18227 - core, webadmin, engine: Added architecture sup= port for VM and Template<o:p></o:p> 18150 - engine: Display type va= lidation<o:p></o:p> 18042 - engine: Vnic interface = validation<o:p></o:p> <o:p> </o:p> We divided the previous patchse= t into smaller patches with specific features, in order to enhance the revi= ew process. We avoided modifying the change #16700 too much, because the re= viewers had already started giving their feedback on it.<o:p></o:p> Looking at the tree, the other = patches are highly dependent on changes #17853/#16700/#1822, and the change= #16700 is the largest one. If there is something to do to help the review = process, please, let us know.<o:p></o:p> <o:p> </o:p> Regards,<o:p></o:p> Leonardo Bianconi/Vitor de Lima/Gustavo Pedrosa<o:p>= </o:p> <o:p> </o:p> </div> </body> </html> --_000_50EB20226B72D6419356FC320AB62B871917274FSERV070corpeldo_--

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[Engine-devel] [oVirt/RHEV 3.3 Localization Question #13] "${ENTITIES_USING_VNIC_PROFILE_COUNTER}"
by Yuko Katabami 15 Aug '13

15 Aug '13

This is a multi-part message in MIME format. --------------000503080408070808020902 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hi all, I would like to ask for your help again with the following questions: *File:* AppErrors *Resource ID: *ACTION_TYPE_FAILED_VNIC_PROFILE_IN_USE *Strings:***Cannot ${action} ${type}. Several ${entities} (${ENTITIES_USING_VNIC_PROFILE_COUNTER}) are using this VM network interface profile: ${ENTITIES_USING_VNIC_PROFILE} - Please remove it from all ${entities} that are using it and try again. *Question:* Is "${ENTITIES_USING_VNIC_PROFILE_COUNTER}" representing the number of entities using the VNIC profile? Is it always greater than 1 or could it be 1 in some cases? Is ${ENTITIES_USING_VNIC_PROFILE} representing the name(s) of entities using the the VNIC profile? Thank you, Yuko -- Regards, Yuko Katabami (?????) Technical Translator II NAATI Accredited Professional Translator (English into Japanese) #28138 RHCSA #111-119-244 *Mobile:* +61 415 847 352 *Email:* ykatabam(a)redhat.com Red Hat *Red Hat, Asia-Pacific Pty Ltd* Level 1, 193 North Quay Brisbane 4000 *Office:* +61 7 3514 8100 *Fax:* +61 7 3514 8199 *Website:* www.redhat.com <http://www.redhat.com> *Facebook:* Red Hat APAC <http://www.facebook.com/redhatapac> | Red Hat Japan <http://www.facebook.com/redhatjapan> | Red Hat Korea <http://www.facebook.com/redhatkorea> | JBoss APAC <http://www.facebook.com/JBossAPAC> *Twitter:* Red Hat APAC <http://www.twitter.com/red_hat_apac> | Red Hat ANZ <http://www.twitter.com/redhatanz> *LinkedIn:* Red Hat APAC <http://www.linkedin.com/groups?gid=3124596> | JBoss APAC <http://www.linkedin.com/groups?gid=4068303> --------------000503080408070808020902 Content-Type: multipart/related; boundary="------------010200040905090003050701" --------------010200040905090003050701 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit <html> <head> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> </head> <body bgcolor="#FFFFFF" text="#000000"> Hi all, I would like to ask for your help again with the following questions: File: AppErrors <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> Resource ID: ACTION_TYPE_FAILED_VNIC_PROFILE_IN_USE Strings: Cannot ${action} ${type}. Several ${entities} (${ENTITIES_USING_VNIC_PROFILE_COUNTER}) are using this VM network interface profile: ${ENTITIES_USING_VNIC_PROFILE}  - Please remove it from all ${entities} that are using it and try again. Question: Is "${ENTITIES_USING_VNIC_PROFILE_COUNTER}" representing the number of entities using the VNIC profile? Is it always greater than 1 or could it be 1 in some cases? Is ${ENTITIES_USING_VNIC_PROFILE} representing the name(s) of entities using the the VNIC profile? Thank you, Yuko <div class="moz-signature">-- Regards, Yuko Katabami (方波見裕子) Technical Translator II NAATI Accredited Professional Translator (English into Japanese) #28138 RHCSA #111-119-244 Mobile: +61 415 847 352 Email: <a class="moz-txt-link-abbreviated" href="mailto:ykatabam@redhat.com">ykatabam(a)redhat.com</a> <a target="_blank"><img src="cid:part1.06060308.09030902@redhat.com" alt="Red Hat" border="0" height="42" width="128"></a> Red Hat, Asia-Pacific Pty Ltd Level 1, 193 North Quay Brisbane 4000 Office: +61 7 3514 8100 Fax: +61 7 3514 8199 Website: <a href="http://www.redhat.com" target="_blank">www.redhat.com</a> Facebook: <a href="http://www.facebook.com/redhatapac" target="_blank">Red Hat APAC</a> | <a href="http://www.facebook.com/redhatjapan" target="_blank">Red Hat Japan</a> | <a href="http://www.facebook.com/redhatkorea" target="_blank">Red Hat Korea</a> | <a href="http://www.facebook.com/JBossAPAC" target="_blank">JBoss APAC</a> Twitter: <a href="http://www.twitter.com/red_hat_apac" target="_blank">Red Hat APAC</a> | <a href="http://www.twitter.com/redhatanz" target="_blank">Red Hat ANZ</a> LinkedIn: <a href="http://www.linkedin.com/groups?gid=3124596" target="_blank">Red Hat APAC</a> | <a href="http://www.linkedin.com/groups?gid=4068303" target="_blank">JBoss APAC</a> </div> </body> </html> --------------010200040905090003050701 Content-Type: image/png; name="redhat-logo.png" Content-Transfer-Encoding: base64 Content-ID: <part1.06060308.09030902(a)redhat.com> Content-Disposition: inline; filename="redhat-logo.png" iVBORw0KGgoAAAANSUhEUgAAAIAAAAApCAYAAAD9LSHtAAAAGXRFWHRTb2Z0d2FyZQBBZG9i ZSBJbWFnZVJlYWR5ccllPAAAA6NpVFh0WE1MOmNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tl dCBiZWdpbj0i77u/IiBpZD0iVzVNME1wQ2VoaUh6cmVTek5UY3prYzlkIj8+IDx4OnhtcG1l dGEgeG1sbnM6eD0iYWRvYmU6bnM6bWV0YS8iIHg6eG1wdGs9IkFkb2JlIFhNUCBDb3JlIDUu MC1jMDYxIDY0LjE0MDk0OSwgMjAxMC8xMi8wNy0xMDo1NzowMSAgICAgICAgIj4gPHJkZjpS 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[Engine-devel] Failed to execute stage 'Misc configuration'
by Michael Pasternak 13 Aug '13

13 Aug '13

Any insight? [ ERROR ] Failed to execute stage 'Misc configuration': Command '/home/mpastern/Coding/ovirt/ovirt-engine/share/ovirt-engine/dbscripts/upgrade.sh' failed to execute [WARNING] Rolling back upgrade * rebased at 20031dd61f6c6517a5e21d38485c3c3b626fd8aa -- Michael Pasternak RedHat, ENG-Virtualization R&D

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[Engine-devel] Deprecating signatures/parameters in restapi (RSDL)
by Michael Pasternak 12 Aug '13

12 Aug '13

Hi All, We have added the ability to deprecate signatures/parameters in RSDL, you can mark parameter as deprecated in rsdl_metadata.yaml file this way [1], please make sure you deprecating signatures/parameters which planned to be non-maintained/removed. thanks. [1] signature parameter: =================== vm.display.type--DEPRECATED: xs:string url parameter: ============= max: {context: matrix, type: 'xs:int', value: 'max results', required: false, deprecated: true} header parameter: ================= Filter: {value: true|false, required: false, deprecated: true} entire signature: ================ - mandatoryArguments: {} optionalArguments: {action.vm.os.initRd: 'xs:string', action.vm.domain.name: 'xs:string', action.vm.placement_policy.host.id|name: 'xs:string', action.vm.placement_policy.affinity: 'xs:string', action.async: 'xs:boolean', action.vm.os.kernel: 'xs:string', action.grace_period.expiry: 'xs:long', action.vm.display.type: 'xs:string', action.vm.stateless: 'xs:boolean', action.vm.os.cmdline: 'xs:string', action.vm.domain.user.username: 'xs:string', action.pause: 'xs:boolean', action.vm.os.boot--COLLECTION: {boot.dev: 'xs:string'}, action.vm.domain.user.password: 'xs:string'} deprecated: true -- Michael Pasternak RedHat, ENG-Virtualization R&D

1 0

[Engine-devel] Port mirroring in 3.4
by Moti Asayag 12 Aug '13

12 Aug '13

Hi All, As part of adding the the vnic profiles feature, the configuration of the port mirroring moved from a vnic level to the profile level which the vnic uses. It unravels the need for granting a specific PORT_MIRRORING action group on the network to allow the user to set a vnic for port mirroring on that network. The old behaviour was simplified by granting the VnicProfileUser role on the profile that the admin permits the user to use. The admin is responsible to determine whether the profile should be served for port mirroring or not. It makes the old PORT_MIRRORING action group redundant, as it is no longer being used for controlling the port mirroring attribute of the network on the vm. An existing permissions for user for port mirroring will be replaced with a proper permissions on a vnic profile setted for port mirroring during upgrade. I would like to remove the PORT_MIRRORING action group entirely from the engine and from the REST as well. Is there any objection for doing so ? Thanks, Moti

1 0

Re: [Engine-devel] [vdsm] How to handle qemu 1.3 dep for Gluster Storage Domain
by Andrew Cathrow 12 Aug '13

12 Aug '13

> ----- Forwarded Message ----- > > From: "Itamar Heim" <iheim(a)redhat.com> > > To: "Sahina Bose" <sabose(a)redhat.com> > > Cc: "engine-devel" <engine-devel(a)ovirt.org>, "VDSM Project > > Development" <vdsm-devel(a)lists.fedorahosted.org> > > Sent: Wednesday, August 7, 2013 1:30:54 PM > > Subject: Re: [vdsm] How to handle qemu 1.3 dep for Gluster Storage > > Domain > > > > On 08/07/2013 08:21 AM, Sahina Bose wrote: > > > [Adding engine-devel] > > > > > > On 08/06/2013 10:48 AM, Deepak C Shetty wrote: > > >> Hi All, > > >> There were 2 learnings from BZ > > >> https://bugzilla.redhat.com/show_bug.cgi?id=988299 > > >> > > >> 1) Gluster RPM deps were not proper in VDSM when using Gluster > > >> Storage > > >> Domain. This has been partly addressed > > >> by the gluster-devel thread @ > > >> http://lists.gnu.org/archive/html/gluster-devel/2013-08/msg00008.html > > >> and will be fully addressed once Gluster folks ensure their > > >> packaging > > >> is friendly enuf for VDSM to consume > > >> just the needed bits. Once that happens, i will be sending a > > >> patch to > > >> vdsm.spec.in to update the gluster > > >> deps correctly. So this issue gets addressed in near term. > > >> > > >> 2) Gluster storage domain needs minimum libvirt 1.0.1 and qemu > > >> 1.3. > > >> > > >> libvirt 1.0.1 has the support for representing gluster as a > > >> network > > >> block device and qemu 1.3 has the > > >> native support for gluster block backend which supports > > >> gluster://... > > >> URI way of representing a gluster > > >> based file (aka volume/vmdisk in VDSM case). Many distros (incl. > > >> centos 6.4 in the BZ) won't have qemu > > >> 1.3 in their distro repos! How do we handle this dep in VDSM ? > > >> > > >> Do we disable gluster storage domain in oVirt engine if VDSM > > >> reports > > >> qemu < 1.3 as part of getCapabilities ? > > >> or > > >> Do we ensure qemu 1.3 is present in ovirt.repo assuming > > >> ovirt.repo is > > >> always present on VDSM hosts in which > > >> case when VDSM gets installed, qemu 1.3 dep in vdsm.spec.in will > > >> install qemu 1.3 from the ovirt.repo > > >> instead of the distro repo. This means vdsm.spec.in will have > > >> qemu >= > > >> 1.3 under Requires. > > >> > > > Is this possible to make this a conditional install? That is, > > > only if > > > Storage Domain = GlusterFS in the Data center, the bootstrapping > > > of host > > > will install the qemu 1.3 and dependencies. > > > > > > (The question still remains as to where the qemu 1.3 rpms will be > > > available) RHEL6.5 (and so CentOS 6.5) will get backported libgfapi support so we shouldn't need to require qemu 1.3 just the appropriate qemu-kvm version from 6.5 https://bugzilla.redhat.com/show_bug.cgi?id=848070 > > > > > > > hosts are installed prior to storage domain definition usually. > > we need to find a solution to having a qemu > 1.3 for .el6 (or > > another > > version of qemu with this feature set). > > > > > >> What will be a good way to handle this ? > > >> Appreciate your response > > >> > > >> thanx, > > >> deepak > > >> > > >> _______________________________________________ > > >> vdsm-devel mailing list > > >> vdsm-devel(a)lists.fedorahosted.org > > >> https://lists.fedorahosted.org/mailman/listinfo/vdsm-devel > > > > > > _______________________________________________ > > > vdsm-devel mailing list > > > vdsm-devel(a)lists.fedorahosted.org > > > https://lists.fedorahosted.org/mailman/listinfo/vdsm-devel > > > > _______________________________________________ > > vdsm-devel mailing list > > vdsm-devel(a)lists.fedorahosted.org > > https://lists.fedorahosted.org/mailman/listinfo/vdsm-devel > > >

1 0

[Engine-devel] LockManager maybe not be really taking locks in your flows...
by Yair Zaslavsky 12 Aug '13

12 Aug '13

Hi all, Thanks to Alon Bar Lev's efforts for preventing to concurrent host installation for the same host entity + Roy Golan's check of the code, we saw that for commands that override getExclusiveLocks() or getSharedLocks() the locking mechanism does not work (lock is not being acquired) if there is no annotation of @LockIdNameAttribute on the class. A bug was filed for removing this annotation (leftover from some historical code ) , but until it is fixed - bare in mind you need to add this annotation in current commands you are working on in order to utilize the mechanism. See RemoveVmCommand (has the annotation) vs AddDiskCommand (which doesn't have the annotation) Cheers, Yair

3 4

[Engine-devel] should we check for active host before activate SD?
by plysan 12 Aug '13

12 Aug '13

Hi all: Currently I get into a situation with a NFS data center which maintained both hosts and storage domains. Now if I first activate host then SD, everything works fine. But if I mistakenly first activate SD, the data center gets into a non responsive status, after this if I try to activate a host, it will get into a non operational state, it seems I can't find a way to get the DC running again. I think a additional check should be done before activate a SD, and i've uploaded a patch for a solution of this issue: http://gerrit.ovirt.org/17940 I haven't test with other storage types, but activating a SD need a functioning host, right? correct me if i'm wrong :) Best regards, plysan

2 2

[Engine-devel] [oVirt/RHEV 3.3 Localization Question #14] "No Position"
by Yuko Katabami 12 Aug '13

12 Aug '13

This is a multi-part message in MIME format. --------------080006040707040909010608 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hello again. I would like to ask one more question with the following details: *File:* ApplicationConstants *Resource ID: * noPositionFilter *Strings:***No Position *Question:* Could anyone please explain the usage of this string and where in the Admin Portal it appears? Thank you, Yuko -- Regards, Yuko Katabami (?????) Technical Translator II NAATI Accredited Professional Translator (English into Japanese) #28138 RHCSA #111-119-244 *Mobile:* +61 415 847 352 *Email:* ykatabam(a)redhat.com Red Hat *Red Hat, Asia-Pacific Pty Ltd* Level 1, 193 North Quay Brisbane 4000 *Office:* +61 7 3514 8100 *Fax:* +61 7 3514 8199 *Website:* www.redhat.com <http://www.redhat.com> *Facebook:* Red Hat APAC <http://www.facebook.com/redhatapac> | Red Hat Japan <http://www.facebook.com/redhatjapan> | Red Hat Korea <http://www.facebook.com/redhatkorea> | JBoss APAC <http://www.facebook.com/JBossAPAC> *Twitter:* Red Hat APAC <http://www.twitter.com/red_hat_apac> | Red Hat ANZ <http://www.twitter.com/redhatanz> *LinkedIn:* Red Hat APAC <http://www.linkedin.com/groups?gid=3124596> | JBoss APAC <http://www.linkedin.com/groups?gid=4068303> --------------080006040707040909010608 Content-Type: multipart/related; boundary="------------080601050400080508090608" --------------080601050400080508090608 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit <html> <head> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> </head> <body bgcolor="#FFFFFF" text="#000000"> Hello again. I would like to ask one more question with the following details: File: ApplicationConstants Resource ID: <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> noPositionFilter Strings: No Position Question: Could anyone please explain the usage of this string and where in the Admin Portal it appears? Thank you, Yuko <div class="moz-signature">-- Regards, Yuko Katabami (方波見裕子) Technical Translator II NAATI Accredited Professional Translator (English into Japanese) #28138 RHCSA #111-119-244 Mobile: +61 415 847 352 Email: <a class="moz-txt-link-abbreviated" href="mailto:ykatabam@redhat.com">ykatabam(a)redhat.com</a> <a target="_blank"><img src="cid:part1.09020107.09080707@redhat.com" alt="Red Hat" border="0" height="42" width="128"></a> Red Hat, Asia-Pacific Pty Ltd Level 1, 193 North Quay Brisbane 4000 Office: +61 7 3514 8100 Fax: +61 7 3514 8199 Website: <a href="http://www.redhat.com" target="_blank">www.redhat.com</a> Facebook: <a href="http://www.facebook.com/redhatapac" target="_blank">Red Hat APAC</a> | <a href="http://www.facebook.com/redhatjapan" target="_blank">Red Hat Japan</a> | <a href="http://www.facebook.com/redhatkorea" target="_blank">Red Hat Korea</a> | <a href="http://www.facebook.com/JBossAPAC" target="_blank">JBoss APAC</a> Twitter: <a href="http://www.twitter.com/red_hat_apac" target="_blank">Red Hat APAC</a> | <a href="http://www.twitter.com/redhatanz" target="_blank">Red Hat ANZ</a> LinkedIn: <a href="http://www.linkedin.com/groups?gid=3124596" target="_blank">Red Hat APAC</a> | <a href="http://www.linkedin.com/groups?gid=4068303" target="_blank">JBoss APAC</a> </div> </body> </html> --------------080601050400080508090608 Content-Type: image/png; name="redhat-logo.png" Content-Transfer-Encoding: base64 Content-ID: <part1.09020107.09080707(a)redhat.com> Content-Disposition: inline; filename="redhat-logo.png" iVBORw0KGgoAAAANSUhEUgAAAIAAAAApCAYAAAD9LSHtAAAAGXRFWHRTb2Z0d2FyZQBBZG9i ZSBJbWFnZVJlYWR5ccllPAAAA6NpVFh0WE1MOmNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tl dCBiZWdpbj0i77u/IiBpZD0iVzVNME1wQ2VoaUh6cmVTek5UY3prYzlkIj8+IDx4OnhtcG1l dGEgeG1sbnM6eD0iYWRvYmU6bnM6bWV0YS8iIHg6eG1wdGs9IkFkb2JlIFhNUCBDb3JlIDUu MC1jMDYxIDY0LjE0MDk0OSwgMjAxMC8xMi8wNy0xMDo1NzowMSAgICAgICAgIj4gPHJkZjpS 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2 2

[Engine-devel] clean testable code
by Giuseppe Vallarelli 11 Aug '13

11 Aug '13

Talking with my teammates I've noticed that there is some confusion related to what testing means and in general how tests can improve the quality of the codebase by favouring the development of components that are of higher quality - unluckily it doesn't favour hair regrowing. Tests are also cool because when done right they represent an executable form of documentation. Some intro material: 1 How to Write Clean, Testable Code by Miško Hevery (A Googler) http://www.youtube.com/watch?v=XcT4yYu_TTs 2 How to write testable code by Miško Hevery (hands on ;-)) http://misko.hevery.com/attachments/Guide-Writing%20Testable%20Code.pdf Examples are provided in Java but the same principles apply to Python as well. 3 TDD by James Shore (a practice created by Kent Beck) http://www.jamesshore.com/Agile-Book/test_driven_development.html A broad article explaining TDD and related concepts. 4 Difference between state based testing and interaction based testing http://martinfowler.com/articles/mocksArentStubs.html Not so intro - but easier to understand after consuming previous material: 5 Mock Roles, not Objects by Freeman and Pryce http://jmock.org/oopsla2004.pdf They both wrote a very interesting book: Growing Object Oriented Software: Guided by Tests http://www.amazon.com/Growing-Object-Oriented-Software-Guided-Tests/dp/0321… I didn't read it yet. Points from 3 to 5 mostly describe a different kind of working practice, which is very opinionated but nevertheless with some interesting ideas. I consider points 1-2 fundamentals. Enjoy, Giuseppe I will share new materials if there's some interest on it.

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