I am not sure where and how I can call createIndex or ensureIndex to ensure I have 2dsphere indexing on the associated mongo database upon application boot. Any pointers would be helpful.
You need to enableGeoIndexing Set to true to enable 2d sphere indexing for model properties of type GeoPoint.
check https://loopback.io/doc/en/lb4/MongoDB-connector.html#installation additional property section.
Related
I am working on some systems that needs to use Access and Refresh tokens.
In my process now, I save tokens in registry, and I update them when they need to be updated. But sometimes, I get an error because one of my process tries to retrieve a token, but this token has been changed just before (like a lock in the registry).
What is the best way to store, update and retrieve that kind of informations ?
I tried to use a class mediator which stores properties in a Hashmap, but WSO2 always create a new instance of my custom class, so a new instance of my hashmap.
Any idea ? Thank you !
The usual practice to store the token is in the registry. This is used in the connector implementation [1] in the ESB server. Could you elaborate more on the issue? What is the ESB server version? What is the error stack trace? Have you used a similar implementation as in [1]?
Further to answer your question regarding the class mediator, you can use a static variable in the class mediator to share the token among the objects created. But then again, static variables are not thread-safe.
[1]-https://github.com/wso2-extensions/esb-connector-gmail/blob/master/src/main/resources/config/getAccessTokenFromRefreshToken.xml
I'm using the registry for reading / storing data, and here is some issue..
When you read using property mediator, for example token - he is also cached for default 15sec. So after read, revoke new one, and store back - you will still get from property mediator the "old" one. This can be bypassed, using script mediator and store registry entry using code, and setting the CachableDurationto 0.
I described this reading storing from registry in my blog, check out especially the Known downside paragraph.
I'm using siddhi to create some app which also interacts with PostgreSQL DB. Although I'm not sure, I believe, there is a bug about making multiple updates on the same PG table, within a single event (i.e. upon receiving an event, update a record in the table, and create another one again in the same table) it seems the batch updates are causing some problems. SO, I just want to give it a try after disabling batchUpdate (it is enabled by default). I just don't know how to configure it using siddhi-sdk (via Intellij plugin). There are two related tickets:
https://github.com/wso2-extensions/siddhi-store-rdbms/issues/43
https://github.com/wso2/product-sp/issues/472
Until these are documented, I'd like to get some quick response how to set these fields.
Best regards...
I'm using siddhi to create some app which also interacts with PostgreSQL DB. Although I'm not sure, I believe, there is a bug about making multiple updates on the same PG table, within a single event (i.e. upon receiving an event, update a record in the table, and create another one again in the same table) it seems the batch updates are causing some problems.
When batchEnabled has been set to true, it will perform the insert/update operation on batch of events instead of performing those operations on each and every single event. Simply, this has been introduced to improve the performance.
The default value of this parameter is currently set to "true".
However, batchEnable configurations is done through a system parameter called, "{{RDBMS-Name}}.batchEnable" which have to be configured in the WSO2 Stream Processor's deployment.yaml
If you want to overide this property in Product-SP please find the steps below.
Open the deployment.yaml file located in {Product-SP-Home}/conf/editor/
Insert the following lines in the file.
siddhi:
extensions:
extension:
name: store
namespace: rdbms
properties:
PostgreSQL.batchEnable: true
But currently there is no way to overwrite those system configurations from the siddhi app level. Since you are using the SDK, what you can do is changing the default value of above parameter to "false".
Please find the steps below do it.
Find the siddhi-store-rdbms-4.x.xx.jar file in the siddhi
sdk. This is located in the {siddhi-sdk-home}/lib/ .
Open the jar file using an archive manager and open the
rdbms-table-config.xml file located inside it with a text editor.
Set false in <batchEnable>true</batchEnable> attribute under the
<database name="PostgreSQL"> tag and save it.
Thanks Raveen. with a simple dash (-) before "extension" I was able to set the config.
siddhi:
extensions:
- extension:
name: store
namespace: rdbms
properties:
PostgreSQL.batchEnable: false
I am trying to retrieve internal attributes from openldap server. More specifically I need to retrieve entryUUID attribute of an object. In LDAP, objectGUID is being fetched from server but couldn't retrieve similar field from openldap.
SCOPE_SUBTREE is being used to retrieve attributes.
Anyone knows way out? Thanks in advance.
It was probably downvoted because it is recommended to use this attribute as a means of uniquely identifying an entry. For example,
"'entryUUID' operational
attribute and associated matching rules and syntax. The attribute
holds a server-assigned Universally Unique Identifier (UUID) for the
object. Directory clients may use this attribute to distinguish
objects identified by a distinguished name or to locate an object
after renaming."
from the offical Open Ldap documentation.
Internal or operational attributes can be requested using '+', which will return operational attributes for a Ldap entry including the entryuuid.
It's an operational attribute, so you have to request it explicitly, or include "+" in the attributes to be returned.
However you should not be using this for your own purposes. It's none of your business. It can change across backup/restore, for example.
So I have an issue trying to get N-datatypes (NVarchar, NClob) to work with ColdFusion ORM using a database which has a default characterset of US7ASCII and an NLS characterset of AL16UTF16.
Essentially, this is solved either by using setFormOfUse() on the Connection, by setting a JVM System Property (-Doracle.jdbc.defaultNChar=true), or by passing that Property along when creating the Connection.
ColdFusion has a spot for adding Connection String attributes, which would work with MySQL, MSSQL, etc., however the Oracle JDBC driver ignores that string and only accepts a Java Properties object (see: javadoc).
Is there any way to pass a Properties object to ColdFusion's datasources?
(Unfortunately, setting the global System Property isn't an option, and I'm not sure how to make ColdFusion ORM/Hibernate account for setFormOfUse(), assuming that's even possible.)
Why the 'Todos.ApplicationAdapter = DS.FixtureAdapter.extend();' replace to '
Todos.ApplicationAdapter = DS.LSAdapter.extend({
namespace: "todos-emberjs"
});
' can be achieved local stores?
what's the meaning of 'namespace: "todos-emberjs"'?
There are how much kinds of adapters? And I should how to use them? How to define an adapter?
(Check out the picture here to see where ADAPTER component fits in)
I just went through EmberJS tutorial recently and from what I understood:
1)What are EmberJS adapters?
The adapters are objects that take care of communication between your application and a server. Whenever your application asks the store for a record that it doesn't have cached, it will ask the adapter for it. If you change a record and save it, the store will hand the record to the adapter to send the appropriate data to your server and confirm that the save was successful.
2)What types of EmberJS adapters are available?
Right now I am only aware of DS.RESTAdapter which is used by default by the store (it communicates with an HTTP server by transmitting JSON via XHR), DS.FixtureAdapter(something like in-memory storage which is not persistent) and DS.LSAdapter(something like local-storage which is persistent).
3)Why LSAdapter instead of FixtureAdapter in Todos tutorial?
FixtureAdapter stores data in-memory and thus whenever you refresh your page, the data gets reassigned to initial values. But LSAdapter is available on github which uses persistent storage to store and retrieve data, hence enabling you to retain all the changes even after you refresh your page.
4)Why namespace: "todos-emberjs"?
If your JSON API lives somewhere other than on the host root, you can set a prefix that will be added to all requests. For example, if your JSON APIs are available at /todo-emberjs/ you would want it to be used as a prefix to all the URLs that you are going to call. In that case, set namespace property to todo-emberjs.
(Hope it helps, loving EmberJS btw !)