Hi, *Platform-specific payload *is the actual payload which will be delivered to the device when the device contacts the server for pending-operations. *Platform-independent *form is used to construct the *Platform-specific payload *& communicate device operations internally within CDM. For example when an user sends a device operation using CDM web-console, *platform-independent *message will be sent from the console -> CDM API -> CDM Core -> Device-platform bundle. Then the *device-platform bundle *will use it to construct the *platform-specific payload.* But there might be situation where some device operation payloads might not delivered to the device when another operation for that device comes-in. IMO in such cases its not good to have many pending *platform-specific payloads *for a single device. If we are to deliver multiple payloads that might introduce an additional overhead in network. In such situations what I suggest is to merge the new payload with the existing payload. To do that we have two options.
1. Use the existing *platform-specific payload *& merge it with the new operation request 2. Use the *platform-independent *form & merge it with new operation request (platform-independent form) & construct a new payload Going through the 1st approach will be harder because then the device-platform bundle will have to have the all the conversion logic need to convert payloads ( *platform-independent -> platform-specific *& *platform-specific -> platform-independent). *In some platforms converting back the *platform-specific payload* might not be possible because the device-platform bundle might use a 3rd party library to do the conversion. So we had to opt out 1st approach. If we follow the 2nd approach, CDM server itself can do the merging of the operation requests because it does not need any platform-specific knowledge to do so. Then the merged *platform-independent payload *can be send to the device-platform bundle to get the corresponding *platform-specific payload.* For do that we need to save the *platform-independent payload *along with the *platform-specific payload.* This approach will reduce the workload of device-platform implementer, which will make easier integration of new platforms. Regards, Lakshitha Harshan Software Engineer Mobile: *+94724423048* Email: hars...@wso2.com Blog : http://harshanliyanage.blogspot.com/ *WSO2, Inc. :** wso2.com <http://wso2.com/>* lean.enterprise.middleware. On Mon, Nov 17, 2014 at 5:59 AM, Dilan Udara Ariyaratne <dil...@wso2.com> wrote: > Hi All, > > This is just to clarify things. > > With reference to defining pending-operations-per-device, why do we need > to have a > *platform-specific payload *and its *platform-independent* *form*? > > What is the expected use-case of this? > > Regards, > > Dilan. > > > > > *Dilan U. Ariyaratne* > Software Engineer > WSO2 Inc. <http://wso2.com/> > Mobile: +94775149066 > lean . enterprise . middleware > > On Mon, Nov 3, 2014 at 5:36 PM, Harshan Liyanage <hars...@wso2.com> wrote: > >> Hi InoshP, >> >> Before explaining the above scenario I'll explain the process of payload >> generation when a request for new operation comes to the CDM core. >> >> 1. CDM Core bundle will detect its device platform using the operation >> code >> 2. Validate the operation against the supported device operations >> 3. Send the operation request to the device-platform bundle for >> converting it to a *device-specific payload* >> 4. Put the converted payload into the *OUT* queue >> >> We have two options when it comes to your scenario. >> 1. Create a new payload including the previous operation & new operation >> 2. Create another payload. So that 2 payloads will be stored in the *OUT >> *queue. >> >> IMO the best option would be 1, since the second option will consume more >> memory in the queue & more bandwidth of the device because it has to take 2 >> payloads. >> For supporting the option 1, we have the following options. >> >> 1. Device platform bundle will take the platform-specific payload in the >> queue & merge it with the new operation >> In this case, the overhead of the device platform bundle will be much >> higher because it must know how to convert back the *platform-specific >> payload* to the *platform-independent* form. This will make writing a >> new device-platform bundle a tedious task because of the complexity of >> payload transformation logic. So I'm -1 on this option. >> >> 2. We'll use a platform-independent format for saving the payload into >> the queue which can be easily merged with new operations. This >> platform-independent payload will be converted when the device contacts the >> CDM server for pending operations. >> This is much more easier method than the first option. But this will >> affect the number of concurrent devices CDM can support due to the >> on-demand conversion of payloads. On the other-hand this method will reduce >> the resource consumption & avoid unnecessary payload transformations. >> Further-more this will reduce the complexity of CDM core because there is >> no need to get the payload corresponding to the operation from the >> device-platform bundle & put it into the OUT queue. >> >> 3. Save the platform-independent payload format along with the >> platform-specific payload in the queue. >> This method will increase the resource consumption because we need more >> memory to keep the platform-independent payload & platform-dependent >> payload in the OUT queue. But this will increase the number of concurrent >> devices CDM can support because the payload is readily available when the >> device contacts the server. >> >> I'm +1 for both 2nd and 3rd options. WDYT? >> >> Thanks, >> >> Best Regards, >> >> Lakshitha Harshan >> Software Engineer >> Mobile: *+94724423048* >> Email: hars...@wso2.com >> Blog : http://harshanliyanage.blogspot.com/ >> *WSO2, Inc. :** wso2.com <http://wso2.com/>* >> lean.enterprise.middleware. >> >> On Mon, Nov 3, 2014 at 3:47 PM, Inosh Perera <ino...@wso2.com> wrote: >> >>> Hi Harshan, >>> If for example, a message to a device is already in the queue and when >>> monitoring happen, a similar payload is generated. How is it handled when >>> it comes to communication between out queue and device platform bundle? >>> >>> Regards, >>> Inosh >>> >>> On Mon, Nov 3, 2014 at 3:20 PM, Harshan Liyanage <hars...@wso2.com> >>> wrote: >>> >>>> Hi, >>>> >>>> Please find the attached proposed device operations flow of CDM. Your >>>> suggestions & feedback is highly appreciated. >>>> >>>> >>>> Thanks, >>>> >>>> Best Regards, >>>> >>>> Lakshitha Harshan >>>> Software Engineer >>>> Mobile: *+94724423048* >>>> Email: hars...@wso2.com >>>> Blog : http://harshanliyanage.blogspot.com/ >>>> *WSO2, Inc. :** wso2.com <http://wso2.com/>* >>>> lean.enterprise.middleware. >>>> >>> >>> >>> >>> -- >>> Inosh Perera >>> Software Engineer, WSO2 Inc. >>> Tel: 0785293686 >>> >> >> >
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