Handling riak CRDT in version 2.1+ using erlang client - erlang
The answer in this post about using riak_kv_crdt shows how to extract counters. I can't locate riak_kv_crdt library api documentation. How would one extract the CRDTs such as map from a bucket object in version 2.1.4?
I checked riakc_pb but couldn't figure out from the documentation if there is any API to extract map from a bucket object. Will appreciate pointers on how to deal with riak data types using erlang code.
In the commit hooks that I am planning to write, I plan to use map datatype to create immutable log append to keep track of user info, and use post-commit hook to update another mutable map, say latest_info to point to latest log for that user. So, I need to be able to extract map from the object, and look at the contents before copying them.
Update
Following Joe's tips in comments, I tried to do map_value on a bucket object containing map but got errors below:
Let us first verify that the object has a map.
> riakc_obj:get_content_type(O1).
"application/riak_map"
Now, let us try to get the map:
> riak_kv_crdt:map_value(O1).
** exception error: no function clause matching
riak_object:get_contents({riakc_obj,
{<<"test_map">>,<<"uinfo_log">>},
<<"ahmed_info_1">>,
<<107,206,97,96,96,96,204,96,202,5,82,60,7,47,197,115,
158,125,191,80,29,34,148,200,...>>,
[{{dict,3,16,16,8,80,48,
{[],[],[],[],[],[],[],[],[],[],[],[],[],...},
{{[],[],[],[],[],[],[],[],[],[],[...],...}}},
<<69,2,0,0,0,11,114,105,97,107,95,100,116,95,109,97,
112,77,2,131,...>>}],
undefined,undefined}) (src/riak_object.erl, line 595)
in function riak_kv_crdt:merge_object/1 (src/riak_kv_crdt.erl, line 186)
in call from riak_kv_crdt:value/2 (src/riak_kv_crdt.erl, line 98)
in call from riak_kv_crdt:map_value/1 (src/riak_kv_crdt.erl, line 140)
Related
Using data movement sdk ,want to remove collection from docs in real time in marklogic?
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Yes, DMSK can reprocess documents in the database including modifying the collections on the documents. The most efficient way to change document collections on the server might be to take an approach similar to the out-of-the-box ApplyTransformListener (as summarized by https://docs.marklogic.com/guide/java/data-movement#id_51555) but to execute a custom module instead of a transform. Summarizing the main points: Write an SJS (Server-Side JavaScript) module that declares a variable (using the JavaScript var statement) to receive the document URIs sent by the client and modifies the collections on those documents using a function such as https://docs.marklogic.com/xdmp.documentSetCollections Install the SJS module in the modules database as described here https://docs.marklogic.com/guide/java/resourceservices#id_13008 Create a QueryBatcher to get the document URIs either from a query on the database or from a client iterator as described here: https://docs.marklogic.com/guide/java/data-movement#id_46947 Supply a lambda function for the QueryBatcher.onUrisReady() method - see https://docs.marklogic.com/javadoc/client/com/marklogic/client/datamovement/QueryBatcher.html#onUrisReady-com.marklogic.client.datamovement.QueryBatchListener- In the lambda function, construct and execute a ServerEvaluationCall to the SJS module, assigning the variable to the URIs passed to the lambda function - see: https://docs.marklogic.com/guide/java/resourceservices#id_84134 Be sure to register failure listeners using the QueryBatcher.onQueryFailure() ApplyTransformListener.onFailure​() methods to log error or otherwise respond to the unexpected. Hoping that helps,
Query tags/context labels of senses using JWKTL
I am working on a project where I need to deal with Wiktionary. For some entries, there are context labels/tags before its sense I want to query for, e.g. idiomatic, transitive like HERE. I am now trying to use JWKTL, to do the job. But it seems no api call supports the query. Can anyone let me know how to get that information by JWKTL, or, is there any other tool can parse the Wiktionary dump .xml file while being able to access that labels/tags? Thanks.
According to Dr. Christian. Meyer, there is currently no API on this. I ended up with pattern matching in the original wiktionary .xml dump.
How to obtain all OIDs from all MIBs
I would like obtain a list of all OIDs in the MIBs that are loaded on a manager and display it to users so that they can choose which MIB object to perform the GET/SET request. I would also like to obtain the syntax and max-access of the object. I'm programming using C++. I want to parse the MIBs to obtain the OIDs, not use snmpwalk. I am trying to use the Net-SNMP MIB_API. I've looked at the manual page but am not clear of how to use the functions to achieve what I want to do. I see that read_all_mibs() is already called when we call init_mib(). That means I don't need to call read_all_mibs() again, right? Could anyone please guide on what is the next step after init_mib() that I should do. Any help would be much appreciated. Thanks.
You should look at the apps/snmptranslate.c file for an example of how to walk the loaded mib tree to get information like the syntax and max-access details. And, no, if you call init_snmp() or init_mib() you don't need to call read_all_mibs()
How do I construct the cake when using Scalaxb to connect to a SOAP service?
I've read the documentation, but what I need to know is:
I'm not using a fictitious stock quote service (with an imaginary wsdl file). I'm using a different service with a different name.
Where, among the thousands and thousands of lines of code that have been generated, will I find the Scala trait(s) that I need to put together that correspond to this line in the documentation's example:
val service = (new stockquote.StockQuoteSoap12Bindings with scalaxb.SoapClients with scalaxb.DispatchHttpClients {}).service
Now, you might be thinking "Why not just search for Soap12Bindings in the generated code"? Good idea - but that turns up 0 results.
The example in the documentation is outdated, or too specific. (The documentation is also internally inconsistent and inconsistent with the actual filenames output with scalaxb.) First, search for SoapBindings instead of Soap12Bindings to find the service-specific trait (the first trait). Then, instead of scalaxb.SoapClients, use scalaxb.Soap11Clients.
CAB file API clarification
Since I'm not really seeing any content anywhere that doesn't point back to the original Microsoft documents on this matter, or source code that really doesn't seem to answer the questions I'm having, I thought I might ask a few things here. (Delphi tag is there because that's what my dev environment is on the code I'm making from this) That said, I had a few questions the API document wasn't answering. First one: fdi_notify messages. What is "my responsibility" is in coding these: fdintCABINET_INFO: fdintPARTIAL_FILE: fdintNEXT_CABINET: fdintENUMERATE: ? I'll illustrate what I mean by an example. For fdintCLOSE_FILE_INFO, "my responsibility" is to Close a file related to handle given me, and set the file's date and time according to the data passed in fdi_notify. I figure I'm missing something since my code isn't handling extracting spanned CAB files...any thoughts on how to do this?
What you're more than likely running into is that FDICopy only reads the cab you passed in. It will use fdintNEXT_CABINET to get spanned data for any files you extract in response to fdintCOPY_FILE, but it only calls fdintCOPY_FILE for files that start on that first cab. To get a directory listing for the entire set, you need to call FDICopy in a loop. Every time you get a fdintCABINET_INFO event, save off the psz1 parameter (next cab name). When FDICopy returns, check that. If it's an empty string you're done, if not call FDICopy again with the next cab as the new path. fdintCABINET_INFO: The only responsibility for this is returning 0 to continue processing. You can use the information provided (the path of the next cabinet, next disk, path name, nad set ID), but you don't need to. fdintPARTIAL_FILE: Depending on how you're processing your cabs, you can probably ignore this. You'll only see it for the second and later images in a set, and it's to tell you that the particular entry is continued from a previous cab. If you started at the first cab in the set you'll have already seen an fdintCOPY_FILE for the file. If you're processing random .cabs, you won't really be able to use it either, since you won't have the start of the file to extract. fdintNEXT_CABINET: You can use this to prompt the user for a new directory for the next cabinet, but for simple spanning support just return 0 if the passed in filename is valid or -1 if it isn't. If you return 0 and the cab isn't valid, or is the wrong one, this will get called again. The easiest approach (if you don't request a new disk/directory), is just to check pfdin^.fdie. If it's FDIError_None it's equal the first time being called for the requested cab, so you can return 0. If it's anything else it's already tried to open the requested cab at least once, so you can return -1 as an error. fdintENUMERATE: I think you can ignore this. It isn't covered in the documentation, and the two cab libraries I've looked at don't use it. It may be a leftover from a previous API version.