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Using the CIM/XML Pull Operations

Using the CIM/XML Pull Operations and FQL query Language

STATUS

<<< The TODO section is being maintained during the review and checkin process

The Pull operations and FQL query language are incorporated into

to keep track of problems, errors, notes, etc. Must be deleted before

OpenPegasus 2.14. This readme defines the characteristics, limitations,

checkin to head of tree. Please feel free to add notes, etc in this

etc. for that implementation.

section as you review/test.>>>>>>

TODO list:

1. Binary operation from OOP. Need to add counter to binary

protocol to be able to count objects in response. Generates

warnings in things like messageserializer and does not work with

OOP right now. Corrected by converting to XML.

2. OpenExecQuery - Code is incorrect in that it does not include the

return from the exec query function to the aggregator yet.

3. Code for Pull part of OpenQueryInstancesRequest a) should be part of

the common CIMOperationRequestDispatcher execCommon code.

4. The changes to WQLCIMOperationRequestDispatcher and CQL... for handling

pull not completed so we feed the responses back to the EnmerationContext

queues

3. Lots of minor TODOs, diagnostics, etc.

4. External runtime variables. Proposing that they be fixed for this release

rather than set by configuration. This should be discussed. Am making

this a separate bug. See bug 9819 for the changes to cover this.

5. Decision on EnumerationContext timeout (separate thread or just

checks during other operations). Can we, in fact really keep the

enumeration context table and queue under control without monitoring

with a separate thread. We must monitor for:

a. Client operation that stop requesting (i.e. inter operation time

exceeds operationTimeout). Note that if it simply exceeds the time

the next operation does the cleanup. The issue is those clients that

simply stop and do not either close or go to completion.

b. We should protect against providers that no not every finish delivering

or take to long between deliveries. This does not exist in Pegasus

today

6. Consider moving some of the code in dispatcher from templates to common

functions which would mean adding intermediate classes in CIMMessage but

would reduce code size.

7. Extension to avoid double move of objects in CIMResponseData (one

into enumerationContext queue and second to new cimResponseData for

response. Want to avoid second move by extending Open/Pull response

messages to include count and CIMResponse data to count objects out

of queue when converting (avoids the second move). Big issue here

with binary data since need to extend format to count it.

8. NEXT TASKS:

a. test the enumeration timeout thread

b. finish and test the OpenQueryInstances

c. Clean up TODOs

d. Find issue when we run makepoststarttests in pullop client with

forceProviderProcesses = true. This causes an operation like

cimcli pei CIM_ManagedElement to not complete (client timeout)

sometimes.

21 November 2013

1. Mergeout from head of tree to 21 November 2013.

18 November 2013

1. Cleanup of a bunch of minor errors and completion of all of the code for

the openQueryInstances except for the PullInstances in Dispatcher and

the aggregator function.

2. OpenqueryInstances added to cimcli.

13 October 2013 CVS branch update.

1. Integrated bug 9786 into the branch. Note that we need to test the

generated statistics.

2. Mergeout executed to update to head of tree as of 8:00 am 13 October 2013.

3. Cleaned up several errors in OOP processing. Note that there is at least

one issue left when we to a pull on ManagedElement in at least one of the

namespaces.

4. Cleaned up some of the outstanding diagnostic code

5. Generally passes all tests except for one test of pullop where it is trying

to pull enum instances CIM_ManagedElement from a particular namespace.

NOTE: I did not make comments here for changes in October despite the fact

that I did 2 mergouts, number of fixes, and a mergein.

30 September 2013 - CVS Update

Mergeout head of tree up to 29 September 2013.

29 September 2013. CVS update.

1. Modified calls to statisticalData.cpp to a) directly call with request

type, b) incorporate the open, pull, etc. messages. However, since these

are not part of the CIM class, we must do something special with them.

See bug 9785 for full solution to this issue.

2. Corrected OOP interface to enable new flag to indicate internal operations

and set host, etc.

3. Add code to CQLOperationsDispatcher and WQLOperationDispatcher to clean

up CIMResponseDataCounter after filtering.

4. Modified ProviderAgent to set Host info for some pull operations.

5. Added new flag to CIMBinMsgSerializer and Deserializer.

17 September 2013 CVS update (Actually two different updates over 3 days)

1. Clean up some issues in CIMMessage.h and CIMMessage.cpp

2. Extend OpenExecQuery to WQL and CQL processors but return not complete

3. Remove memory leak in EnumerationContext and EnumerationContextTable

handling.

4. Created template functions for much of the pull operations.

5. Reversed order of queryLanguage and query (and changed names to match

execQuery) in client and server. Note that these are the execQuery

WQL and CQL filters and NOT FQL filters.

6. Some code cleanup in dispatcher

7. Today, passes all tests in pullop but issue in alltests. For some reason

not finding CIMObjectManager instance. Also, leaves enumeration contexts

if client terminates since cleanup thread not operating.

8. XML from OOP not correctly processed.

14 September 2013 CVS update

Merged out up to 25 August. Cleaned up all operations and standardized code.

At this point the non pull operations code is in a set of templates but the

pull is not yet.

Fixed a significant number of problems so that it appears that the operations

except for OpenExecQuery run stably, at least with the pullop test program.

Note that there is a problem in that the Interop control provider is not

returning its singleton wbemserver object for some reason. Causes a test

failure

Fixed for 16 June CVS Update

1. Cleaned up the enumerationContext and Table release functions and tested

to confirm that we do not lose memory in either normal sequences or

sequences that close early. Cleaned up pullop and added more tests

Taged Before: PREAUG25UPDATE and after POSTAUG25UPDATE

Fixed for 9 June CVS update

1. Cleaned up code for OpenQueryInstances. Note that this is incomplete.

No support in WQL or CQL Operations

What was fixed for 5 June checkin.

1. Extended ResponseTest MOF for for both CMPI and C++ subclasses

2. Fixed issues with pullop.

3. Fixed temp issue with CIMResponseData size by putting in mutex. That

is not a permanent fix but it gets around issue probably in the control

of the move logic that meant counts were off.

4. Fixed issues in Dispatcher so that associator code works. Still messy

code in the dispatcher.

5. Changed name of Enumerationtable.h & cpp to EnumerationContextTable.*

6 Changed name of ResponseStressTest module, classes, etc.

TAG: TASK_PEP317_5JUNE_2013_2

2 June 2013

Issues - KS

- Still way to many TODO and KS comments and KS_TEMPS. Removing bit by bit.

- Runtime variable connection for the config parameters not installed. That

has been made into a separate bug (see bug 9819)

5. Issue with the threaded timer. For some reason during tests it

eventually calls the timer thread with trash for the parm (which is

pointer to the EnumerationTable object). Caught because we do a valid

test at beginning of the function.

6. Still using the templates in CIMOperationRequestDispatcher to simplify

the handle... processing.

7. I think I have a way around the double move of objects in the

EnumerationContext so that the outputter will just take a defined number

of objects directly from the gathering cache and save the second move.

8. Not yet passing all tests but getting closer now. The major test that is

causing an error today is the execution of a full enumeration with the

forceProviders = true. This causes a client timeout sometimes.

===========================================

OVERVIEW:

The operation extensions for pull operations defined in the DMTF specification

DSP0200 V 1.4 were implemented in Pegasus effective Pegasus version 2.11

DSP0200 V 1.4 were implemented in Pegasus effective Pegasus version 2.14

including Client and Server.

These operations extend the CIM/XML individual operations to operation

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The following new CIM/XML operations as defined in DSP0200 are included;

-OpenEnumerateInstances

-openEnumerateInstancePaths

-OpenEnumerateInstancePaths

-OpenReferenceInstances

-OpenReferenceInstancePaths

-OpenAssociatiorInstances

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-PullInstancePaths

-PullInstances

-CloseEnumeration

-EnumerationCount

-EnumerationCount (deprecated by DMTF and incomplete)

OpenExecQuery

The following operations have not been implemented in this version of Pegasus:

-OpenQueryInstances

The following limitations on the implementation exist;

1. The filterQueryLanguage and filterQuery parameters are processed by

the Pegasus client but the server returns error if there is any data in

either parameter. This work does not include the development of the

query language. Note that a separate effort to extend Pegasus to use

the DMTF FQL query language is in process.

2. The input parameter continueOnError is processed correctly by the client

but the Pegasus server only provides for false since the server does not

include logic to continue processing responses after an error is

encountered.

This is consistent with the statement in the specification that use of

this functionality is optional and the fact that the DMTF agrees that all

of the issues of continuing after errors have not been clarified.

3. The operation enumerationCount is not processed by the server today since

a) really getting the count would be the same cost as the corresponding

enumeration, b) the server does not include a history or estimating

mechanism for this to date.

NOTE: After a through review as part of the development of the next version

of CMPI we have concluded that this operation is probably not worth the

effort. Since it is optional, Pegasus will only return the unknown status

at this point

Since the concept of sequences of operations linked together (open, pull, close)

is a major extension to the original CIM/XML operation concept of completely

independent operations several new pieces of functionality are implemented

to control interOperationTimeouts, counts of objects to be returned, etc.

to control interOperation timeouts, counts of objects to be returned, etc.

NOTE: More detailed information on the pull operations is contained in:

1. The OpenPegasus wiki (pull operations work group)

2. The pull operations PEP (preliminary today)

3. Presentations in the OpenPegasus wiki, in particular in the

pull operations workgroup documentation at:

TBD - Review this

https://wiki.opengroup.org/pegasus-wiki/doku.php?id=dev:workgroups:pulloperationsupportworkgroup:pull_operation_support_work_group

CLIENT

OPENPEGASUS CLIENT

The new operations follow the same pattern as the APIs for existing operations

in that:

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endOfSequence which is the marker the server sends in open and pull

responses when it has no more objects to send.

The significant differences include:

The significant differences between the open... and original enumerate,

associator, and reference operations includes:

1. Processing of parameters on responses (i.e. the endOfSequence and

1. The new pull client operations typically require multiple client operations

enumerationContext parameters are returned for open and pull operations).

to retrieve a complete set of data (ex. OpenEnumerateInstances and

PullInstancesWithPath) are equivalent to the old EnumerateInstances

client request.

2. Processing of parameters on responses (i.e. the endOfSequence and

enumerationContext parameters are returned for open and pull operations)

These return arguments are used to control the loop retrieving data

for an enumeration sequence (ex. the sequence of OpenEnumerateInstances

and PullInstancesWithPath that represents a complete enumeration

sequence). The sequence continues until the server responds with

EndOfSequence is true, and the enumerationContext is the identifier

for the sequence.

2. Numeric arguments (Uint32 and Uint64 include the option of NULL in some

3. Numeric arguments (Uint32 and Uint64) include the option of NULL in some

cases so they are packaged inside classes Uint32Arg and Uint64Arg in the

client api.

client API.

4. The openAsociatorInstances and openReferenceInstances operations ONLY

process instances. They do not include the capability to return classes

as reference and associator requests do and therefore return CIMInstance

rather than CIMObject.

3. The association and reference operations ONLY process instances. They do

5. Paths are returned for the instance operations as part of the returned

not include the capability to return classes like reference and associator

instances (ex. OpenEnumerateInstances and PullInstancesWithPath) where

do and therefore return CIMInstance rather than CIMObject.

they were not with EnumerateInstances.

4. Paths are returned in all cases (i.e OpenEnumerateInstances and

6. The client must maintain state between operations in an enumeration

PullInstancesWithPath where they were not with EnumeratInstances.

sequence (using the enumerationContext parameter returned with open

and pull responses). The client must always return the last

enumerationContext received as the server may modify the

enumerationContext for each response in an enumeration sequence.

5. The client must maintain state between operations in a sequence (using

The client API is defined in the header file:

the enumerationContext parameter).

TBD- Are there more differences.

pegasus/src/Pegasus/Client/CIMCLient.h

SERVER

OPENPEGASUS SERVER

The Pegasus server attempts to always deliver the requested number of objects

The Pegasus server attempts to always deliver at least some objects

for any open or pull request (the specification allows for the server to

in a response. It does not wait to deliver the exact number requested but

deliver less than the requested number of objects and specifically to return

waits to deliver at least some. The sever will wait about 15 seconds to

zero objects on open). We felt that it was worth any extra cost in processing

deliver and if there is nothing delivered from the providers it will then

to provide the client with exactly what it had requested.

return a response with zero objects in it so that the client does not

timeout. This would only occur if the providers are extremely slow (i.e.

greater than 15 seconds) in preparing response objects to be delivered.

The pegasus server always closes an enumeration sequence upon receipt of any

The Pegasus server always closes an enumeration sequence upon receipt of any

error from the providers, repository, etc. Therefore the server will reject

any request that has continueOnError = true;

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future to support the continueOnError other than possibly allowing the provider

to continue processing after it has received an error.

PROVIDERS

OPENPEGASUS PROVIDERS

This implementation requires NO changes to the existing providers. The

This implementation (OpenPegasus version 2.14) requires NO changes to the

provider APIs operate just as they do with the original operations.

existing providers. The provider APIs operate just as they do with the

original operations.

Because the server processing is different however, there may be some

behavior differences primarily because the client now controls the speed of

delivery of objects.

In previous versions of Pegasus, the server attempts to deliver objects as

In previous versions of Pegasus, the server attempted to deliver objects as

rapidly as then can be put on the network. In the case of HTTP chunked requests

they are delivered in chunks of about 100 objects. The primary delay for the

providers was the processing of each segment through the server. The server

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and then delivered as one non-chunked response. There were no delays for the

providers, just lots of possible memory use in the server.

The responses from providers (delivered through the deliver(...) interface are

The responses from providers (delivered through the deliver(...) interface) are

gathered into segments of about 100 objects and this group of objects is moved

through the server to be delivered to the client.

However with the inclusion of the pull operations, The segments of objects

However with the inclusion of the pull operations, the segments (CIMResponseData

from the providers are cached in the server response path until the

objects containing the instance or path objects) from the providers are cached

maxObjectCount for that request (open or pull) and that number returned in a

in the server response cache until the next pull request and that number

non-chunked response. Thus, if the client is slow to issue pull requests,

is returned in the response to that pull. Thus, if the client is slow to issue

the providers might be delayed at some point to reduce memory usage in the

pull requests, the providers might be delayed at some point to reduce memory

server (the delay appears as slow response tothe deliver operation).

usage in the server (the delay appears as slow response to the deliver operation).

In other words, the time to process large sets of responses from the provider

now depends on the speed of handling the client.

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provider gathering very large arrays of objects and sending them to the

server.

NEXT GENERATION PROVIDERS

FQL (FILTER QUERY LANGUAGE)

KS_TODO

CONFIGURATION PARAMETERS

The FQL implementation is complete in accord with the DMTF

specification DSP 0212 except for a few issues including:

The server includes several configuration parameters to set limits on the

processing of pull operations. All of these configuration parameters are

compile time parameters rather than runtime.

1. Maximum value of minimum interoperation time. This parameter defines the

maximum time allowed between the return of an open or pull response and

the receipt of the next pull or a close operation before the server may

close the enumeration. The specification allows the server to set a

maximum interoperation time and refuse open requests that with requested

operationTimeout greater than that time.

CIM_ERR_INVALID_OPERATION_TIMEOUT

This value is set with the Pegasus environment variable

PEGASUS_PULL....

2. Maximum objects returned in a single open or pull operation. The server

can set a maximum limit on the number of objects that can be returned in

a single open or pull oepration with the maxObjectCount parameter.

3. Whether the server allows 0 as an interoperation timeout value. The value

zero is s special value for the interoperationTimeout in that it tells the

server to not timeout any enumeration sequence.

With this value for interoperationTimeout, the only way to close an

enumeration sequence is to complete all of the pulls or issue the close.

If for some reason the sequence is not completed, that enumeration context

would remain open indefinitly. Since in Pegasus any open enumeration

context uses resources (the context object and any provider resposnes that

have not yet been issued in a response) it would appear that most

platforms would not want to allow the existence of enumeration contexts

that cannot be closed by the server.

4, maximum consecutive pull requests with 0 maxObjectCount. The use of the

1. The regex for the LIKE operation is the same as CQL basic. It provides

pull operation with maxObjectCount set to zero could be used to keep an

only the following special characters "." and "*".

enumeration context open indefinitly (this tells the server to restart the

2. The implementation does not include the comparison of

interoperationTimeout but not send any objects in the response). Therefore the

embeddedInstances

specification allows for the server setting maximum limits on this behavior

3. The implementation does not include the handling of Uint8[] as

and returning the error CIM_ERR_SERVER_LIMITS_EXCEEDED if this limit is

strings.

exceeded.

Note that this is maximum CONSECUTIVE pulls so that issuing a pull with

a non-zero count resets this counter.

KS-TBD - Is this really logical since we can still block by just issuing

For more details on the FQL implementation see the readme.txt in the

lots of zero request and an occansional request for one object.

directory pegasus/src/Pegasus/FQL.

Pegaus sets the value of this limit to 1000 and allows the implementer to

OpenPegasus will remove these limitations in a future version.

modify it with the PEGASUS_MAXIMUM_ZERO_OBJECTCOUNT environment variable.

5. Default operationTimeout -

The FQL implementation includes a large set of sample queries in the

directory:

The default of this parameter is to refuse operat

pegasus/src/Pegasus/FQL/tests/Parser

In the current release of Pegasus these are all compile time parameters.

including both good and error generating queries.

==================================================================

LIMITATIONS IN OPENPEGASUS 2.14

NOTES On working with task branch.

1. The openQueryInstances does not allow requesting the class on response.

Merge out Process

2. The openEnumerateInstanceNames, openAssociatorNames, and openReferenceNames

do not allow use of the query filter. This is because

a. The intention is to deprecate these operations completely and remove

them in a future version

b. They require that the server call the providers with the corresponding

enumerate, associators, references to get the full instances to

filter

To keep our TASK branch in sync with the current head of tree we need

3. The filterQuery filtering is done by the server, not the providers in this

to do a regular merge out. the TaskMakefile contains the makefile

version of OpenPegasus. This will be modified in a future version of

procedures to do this efficiently. NOTE: Following these procedures is

OpenPegasus when the provider API extensions for the pull operations

important in that you are merging out new material each time you do

have been resolved. Version 2.1 of the CMPI specification will resolve

the merge out. If you were just to repeatedly merge out, you would be

this issue.

merging previously merged changes a second time causing a real mess.

Start with new directory and put TaskMakefile above pegasus (needed so you

4. The input parameter continueOnError is processed correctly by the client

have this file for the initial operations.

but the Pegasus server only provides code for 'false' value, since the server

does not include logic to continue processing responses after an error is

encountered.

This is consistent with the statement in the specification that use of

this functionality is optional and the fact that the DMTF agrees that all

of the issues of continuing after errors have not been clarified.

make -f TaskMakefile branch_merge_out BNAME=PEP317-pullop ## takes a long time

5. The operation enumerationCount is not processed by the server today since

a) Getting the count would be the same cost as the corresponding

enumeration, b) the server does not include a history or estimating

mechanism for this to date.

NOTE: After a through review as part of the development of the next version

of CMPI we have concluded that this operation is probably not worth the

effort. Since it is optional, Pegasus will only return the unknown status

at this point. Further it is the intention of the DMTF to deprecate this

function.

This checks out current head, merges it into task branch and sets tags

===================================================================

for the mergeout. Note that at the end of this step this work is

PULL OPERATION CONFIGURATION PARAMETERS

part of the TASK... branch.

NOW check for conflicts, errors, etc. that resulted from the merge.

The server includes several configuration parameters to set limits on the

Look for conflict flags, compare the results (I use linux merge as a

processing of pull operations.

good graphic compare tool) and build and test. When you are satisfied

that the merge out is clean, you can commit the results to the TASK...

branch

To commit the work to this into Task branch

RUNTIME CONFIGURATION PARAMETERS

make -f mak/TaskMakefile branch_merge_out_commit BNAME=PEP317-pullop

1. Maximum value of interoperation time (pullOperationsMaxTimeout) -

This parameter defines the maximum time allowed between the return of an open

or pull response and the receipt of the next pull or a close operation before

the server may close the enumeration.

The specification allows the server to set a maximum interoperation time and

refuse open requests that with requested operationTimeout greater than that time.

2. Maximum number of objects returned in a single open or pull operation

(pullOperationsMaxObjectCount) - The server can set a maximum limit on the

number of objects that can be returned in a single open or pull operation

with the maxObjectCount parameter. This parameter sets the maximum limit.

The absolute maximum allowed without recompiling (and changing a value in

Common/Constants.h) is 10000.

3. Default operationTimeout (pullOperationsdefaultTimeout) - If the client

does not specify an operation timeout in the open request, the server uses

the value defined by this runtime configuration variable. The default

is 30 seconds.

COMPILE TIME CONFIGURATION PARAMETERS

1. Whether the server allows 0 as an interoperation timeout value - The value

zero is a special value for the interoperationTimeout in that it tells the

server to not timeout the enumeration sequence. This should never be used

as it allows a client to open enumeration sequences that will not be

cleaned up if the client does not properly terminate them. There is a

compile time variable in CIMOperationRequestDispatcher that would allow this

to be set so 0 interoperation is allowed but we recommend that it never

be used since it removes a significant component of the server management

of enumerationContext information.

or manually commit and finish as follows

With this value for interoperationTimeout, the only way to close an

enumeration sequence is to complete all of the pulls or issue the close.

If for some reason the sequence is not completed, that enumeration context

would remain open indefinitely. Since in Pegasus any open enumeration

context uses resources (the context object and any provider responses that

have not yet been issued in a response) it would appear that most

platforms would not want to allow the existence of enumeration contexts

that cannot be closed by the server.

cvs commit

2. Maximum consecutive pull requests with 0 maxObjectCount - The use of the

make -f mak/TaskMakefile branch_merge_out_finish BNAME=PEP317-pullop

pull operation with maxObjectCount set to zero could be used to keep an

enumeration context open indefinitely (this tells the server to restart the

interoperationTimeout but not send any objects in the response). Therefore the

specification allows for the server setting maximum limits on this behavior

and returning the error CIM_ERR_SERVER_LIMITS_EXCEEDED if this limit is

exceeded.

## This last step is important since it cleans up temporary tags to prepare

Note that this is maximum CONSECUTIVE pulls so that issuing a pull with

you for the next checkout

a non-zero count resets this counter.

COMPARE TASKBRANCH WITH HEAD

Pegasus sets the value of this limit to 1000 and allows the implementer to

modify it by compiling with the PEGASUS_MAXIMUM_ZERO_OBJECTCOUNT define in

CIMOperationRequestDispatcher.cpp modified.

3. Time to wait for next response from providers - In the case where providers

are responding very slowly, the goal is to generate responses with

zero instances at regular intervals to allow the client to keep the

enumeration context alive. This wait time is set by a compile time define

(PEGASUS_PULL_MAX_OPERATION_WAIT_SEC)in pegasus/src/Pegasus/Common/Constants.h

and is set to 15 seconds in the current release.

4. Time to wait before killing off an enumeration context that is blocked

by missing provider responses. In the rare case where providers do not complete

their responses to the server there is a compile-time counter that trys to

clean up the providers and finally just kill the enumeration sequence after

a defined number of consecutive pulls that return zero objects.

The limit is defined in pegasus/src/Pegasus/Constants.h

NOTE: The development team is trying to consolidate all such constants and

#define definitions that control overall server characteristics but are not

runtime parameters in Constants.h

===================================================================

TESTING

The pull operations are tested primarily with two client programs in the

directory Pegasus/Client/tests

1. pullop and it corresponding Makefile provide extensive tests of the

pull operations and comparison of the results with the corresponding non

pull operations.

2. PullErrors tests a number of error scenarios with the pull operations.

3. cimcli has been extended to allow execution of the pull operations with new

operations that parallel the existing operations:

enumerateinstances(ei) - corresponding is pullenumerateInstances(pei)

ni -> pni enumerateInstanceNames

r -> pr references

rn -> prn referenceNames

a -> pa associators

ar -> par associatorNames

In a new pegasus work space do same as above for merge out.

These execute complete pull sequences (open, pull) with cimcli options

to control parameters like maxObjectCount, interoperation Timeout, etc.

make -f TaskMakefile BNAME=PEP317-pullop

This produces a result which is all of the head merged into the branch.

=============================================================

A diff of this is all the new changes to the head of tree that you will

TODO LIST - Post 2.14 release

include into the merge.

1. Binary operation from OOP. Need to add counter to binary

protocol to be able to count objects in response. Generates

warnings in things like messageserializer and does not work with

OOP right now. Fixed by converting to XML. Concluded that we do not

need to do this. The binary response is not really used often

in the current environment So double mapping it is not a major issue.

Leave this as FUTURE

2. Minor TODOs, diagnostics, etc. still in the code. Reduced almost to

none now. We are leaving some in as PEGASUS_DEBUG

3. Extension to avoid double move of objects in CIMResponseData (one

into enumerationContext queue and second to new cimResponseData for

response. Want to avoid second move by extending Open/Pull response

messages to include count and CIMResponse data to count objects out

of queue when converting (avoids the second move). This would mean

extending the output writers to allow the count field to be supplied

so they would only create output for up to the count supplied.(Make

this future beyond bug 9676). This is fairly extensive because it

extends beyond CIMResponseData to SCMO and XML writers where the

XmlWriters used by encodeXmlResponse would have to have counters

added. Then instead of copying on getCache we would simply pass the

cache and count on and the writer would take and remove.

4. Add more static tests (currently only OpenEnumerateInstances and

OpenEnumerateInstanceNames covered).

5. Correct issue between operations and HTTP where we are sending

trailers with exceptions. Modify response mechanisms so that we

set non-chunked for all responses where we send error responses to

avoid the trailers. NOTE: There should be now a bug on this in general

where we would want to send an initial error without the trailer. Should

have always done that.

6. It would be more efficient in dispatcher to always use exception for

rejects and change the _reject functions so that they never return

when they reject. This is VERY LOW PRIORITY and primarily saves

a few lines of code in the reject functions and their calls. Means we

would code.

_rejectIfEnumerationToBroad(...);

_rejectIfThisParameterIncorrect(...);

instead of

if (_rejectIfEnum...)

{

return true

}

It would mean that the method trace for the handlers would not return

an exit if we rejected. VERY LOW PRIORITY. Possibly FUTURE. No behavior

change, just more compact source code but it messes with the method

trace logic.

7. There are still a couple of template functions around the task of

distributing requests to the multiple providers.

In fact there are two similar but different templates for

the associators(i.e. assoc, ref, etc.) functions and the parallel

openAssoc functions. It would be nice to consolidate that logic and

further to try to create a non-template form for those functions. LOW

PRIORITY

8. Trace functions in CIMResponseData,h & cpp should be PEGASUS_DEBUG.

Same for trace function in EnumerationContext and

EnumerationContextTable

9. Question. We added trace in CIMRequestOperationDispatcher.cpp if

query enum is recevied with no object path. However, since this is

a provider problem should we be doing something other than a trace

(ex. log) since traces are often not really used and they do generate

lots of data whereby something like this could get lost. Also, need

to review what level of trace if we keep trace.

10. Better statistics keeping for open, etc. through cimperf.

11. Incorporate a simple test of pull operations into the TestClient

12. Define a simpler iteration interface for the client so that

the client does not have to directly control the open, pull, etc.

operations.

Legend:

Removed from v.1.1.2.16
changed lines
	Added in v.1.3

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