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Argenta Sugden

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Aug 3, 2024, 10:57:06 AM8/3/24
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I do a lot of database IO and constantly hit the queue limit. Is there a way to get the current queue size and how can it be increased?Or is it even advised to do that or would a wrapper around the database with its own queue be the better option?

1000 queued tasks seems like a lot to me. Clearly, slick is using an executor with a fixed size queue (1000 elements), and you're running into that limit because tasks are not being retired quickly enough.

Probably the most interesting metric there would be usage, as that will show you how long connections are out of the pool between getConnection() and close(). As you tune your database and/or queries, you want to see that number start dropping.

One crucial point is, if the database cannot keep up with your application load, increasing the slick queue from 1000 to 5000 (or even 10000) will buy you nothing except a small amount of time before it reaches that limit. You have to find the source of the performance bottleneck and eliminate it, such that queues are retired faster than your application generates them (excepting temporal spikes of course).

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I have the post loading and content on page looks how I want but the slider it self is not working however the slick files are loading fine because I have switched to the CDN versions to make sure I can get this going before adding the files in.

What I get on the front end is my slide looking as it should but with a grey button above = Previous and one below = Next which when clicked work as you would expect and the slide move to the next one along.

One other thing rich, I am looking into starting a side project using WordPress to handle a few of the features and have been keeping my eye out for someone who may be interested in giving it a bash. There is not another site out there IN THE WORLD doing this and it is only through a previous job that I know it could work. Drop me an email cr...@digimouse.co.uk if you want a little further detail :)

I've gotten Slick running with Custom Post Types UI and ACFP without issue. I'd definitely be wary of conflicting JS. If your theme doesn't need it, might as well save the resources anyway and stop it from loading even if it's not the problem.

Hi guys, could one of you help me out getting slick running correctly. I will be needing to use it in the future as its my go to slider when just working with html sites so id really like to have my use of it moved into wordpress to.

It doesn't look far off what I have so it's a little odd it's not working. I've made a few tweaks to your code but you may need to add some of your styles back in so I'd recommend backing everything up before trying it just to be safe :)

The Slick connector provides Scala and Java DSLs to create a Source to stream the results of a SQL database query and a Flow/Sink to perform SQL actions (like inserts, updates, and deletes) for each element in a stream. It is built on the Slick library to interact with a long list of supported relational databases.

You will also need to add the JDBC driver(s) for the specific relational database(s) to your project. Most of those databases have drivers that are not available from public repositories so unfortunately some manual steps will probably be required. The Slick documentation has information on where to download the drivers.

You can specify multiple different database configurations, as long as you use unique names. These can then be loaded by fully qualified configuration name using the SlickSession.forConfig() method described above.

This can be useful if you need to share you configurations with code using Slick directly, or in cases where you first get the database information at runtime, as the Slicks Database class offer factory methods for that. This method is only available in the scaladsl, as Slick has no Java API and as such no easy way of creating a Database instance from Java.

Slick requires you to eventually close your database session to free up connection pool resources. You would usually do this when terminating the ActorSystem, by registering a termination handler like this:

Some database systems, such as PostgreSQL, require session parameters to be set in a certain way to support streaming without caching all data at once in memory on the client side, see Slick documentation.

Unfortunately, String interpolation is a Scala language feature that cannot be directly translated to Java. This means that query strings in the Java DSL will need to be manually prepared using plain Java Strings (or a StringBuilder).

If you want to take a stream of elements and turn them into side-effecting actions in a relational database, the Slick connector allows you to perform any DML or DDL statement using either a Sink or a Flow. This includes the typical insert/update/delete statements but also create table, drop table, etc. The unit tests have a couple of good examples of the latter usage.

The following example show the use of a Slick Sink to take a stream of elements and insert them into the database. There is an optional parallelism argument to specify how many concurrent streams will be sent to the database. The unit tests for the slick connector have example of performing parallel inserts.

The Slick connector also exposes a Flow that has the exact same functionality as the Sink but it allows you to continue the stream for further processing. The return value of every executed statement, e.g. the element values is the fixed type Int denoting the number of updated/inserted/deleted rows.

To have a different return type, use the flowWithPassThrough function. E.g. when consuming Kafka messages, this allows you to maintain the kafka committable offset so the message can be committed in a next stage in the flow.

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