cqengine | Ultra-fast SQL-like queries on Java collections | Time Series Database library

by npgall Java Version: 3.6.0 License: Apache-2.0

X-Ray Key Features Code Snippets Community Discussions(2)Vulnerabilities Install Support

kandi X-RAY | cqengine Summary

cqengine is a Java library typically used in Database, Time Series Database applications. cqengine has no bugs, it has no vulnerabilities, it has a Permissive License and it has high support. However cqengine build file is not available. You can download it from GitHub.

CQEngine solves the scalability and latency problems of iteration by making it possible to build indexes on the fields of the objects stored in a collection, and applying algorithms based on the rules of set theory to reduce the time complexity of accessing them.

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Quality

Security

License

Reuse

Support

cqengine has a highly active ecosystem.

It has 1604 star(s) with 238 fork(s). There are 88 watchers for this library.

It had no major release in the last 6 months.

There are 61 open issues and 219 have been closed. On average issues are closed in 96 days. There are 10 open pull requests and 0 closed requests.

It has a positive sentiment in the developer community.

The latest version of cqengine is 3.6.0

Quality

cqengine has 0 bugs and 0 code smells.

Security

cqengine has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

cqengine code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

cqengine is licensed under the Apache-2.0 License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

cqengine releases are not available. You will need to build from source code and install.

cqengine has no build file. You will be need to create the build yourself to build the component from source.

Installation instructions are not available. Examples and code snippets are available.

cqengine saves you 949553 person hours of effort in developing the same functionality from scratch.

It has 443063 lines of code, 2530 functions and 1564 files.

It has medium code complexity. Code complexity directly impacts maintainability of the code.

Top functions reviewed by kandi - BETA

kandi has reviewed cqengine and discovered the below as its top functions. This is intended to give you an instant insight into cqengine implemented functionality, and help decide if they suit your requirements.

Performs an incremental query
Get the range bounds from a given query
Retrieves a result set using an index
Processes the bulk query
Retrieves the result set
Returns a union of results sets
Perform the retrieve operation
Executes the query
Perform the actual query
Initialize the collection
Gets a connection for the given index
Returns an iterator over the wrapped result set
Retrieves an iterator from the result set
Compares two objects
Gets all matches for a simple attribute
Read the generic object type
An iterator over this ResultSets
Read generic attribute type
Performs the actual operation
Removes the given index
Returns an iterator over the objects in this collection
Returns a map of variable names to their values
Parse the given query string
Parse given query string
Marks the stream as read
Returns an iterator which iterates over the request - scope resources

Get all kandi verified functions for this library.

cqengine Key Features

No Key Features are available at this moment for cqengine.

cqengine Examples and Code Snippets

No Code Snippets are available at this moment for cqengine.

Community Discussions

Trending Discussions on cqengine

CQEngine query overhead / precompiled parameterized queries

Add message store spring integration dsl

QUESTION

CQEngine query overhead / precompiled parameterized queries

Asked 2021-Mar-04 at 14:17

When I query an indexed collection many times and the query is the same and only differs in the attribute value, how big is the overhead to execute it?

Is there a way to precompile a parameterized query to get rid of this overhead?

Edit: Here's a simple benchmark showing that making multiple retrievals from a CQEngine collection with a hash index tends to be ~18 times slower than retrieving items from a LinkedHashMap.

https://github.com/Inego/cqe-simple-benchmark/blob/main/src/main/kotlin/Benchmark.kt

...

ANSWER

Answered 2021-Mar-02 at 19:48

There is no support for parameterized queries per-se.

However if you would like to reduce the overhead of constructing queries frequently, such as the impact on garbage collection, you can leverage the fact that queries are immutable and stateless, and cache frequently used queries.

Queries are trees. So you can also cache frequently used branches of queries and reassemble query trees on the fly where branches are retrieved from cache.

However that said, generally the overhead of constructing queries should be pretty small. Id recommend to benchmark your application to see if this really is worthwhile.

Source https://stackoverflow.com/questions/66169377

QUESTION

Add message store spring integration dsl

Asked 2020-Jan-04 at 15:19

I am currently looking at the options to add real-time tracking of all the messages going over in my application.

I have enabled messagehistory so technically I'll get all the steps happened during the flow.

Now I want to store each message with the history in disk cache using CQEngine as it has great support and is very quick.

Then from the UI I'll show the message and history and display using GraphVIZ so the users can actually see the lifecycle of each message with diagram.

Option # 01

Add the call in the handle() method in each flow to add the message and history asynchrnously in the disk cache.

But this means I'll have to manually do that every time for new flow.

Is there any option 02 I can utilize like adding interceptor etc that will be called whenever a flow is completed succesfully or un-sucessfully?

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ANSWER

Answered 2020-Jan-04 at 15:19

You need to use a WireTap interceptor for channels: https://docs.spring.io/spring-integration/docs/5.2.2.RELEASE/reference/html/core.html#channel-interceptors. And configure a global channel interceptor pattern for that wire-tap to specify those channels you would like to track. The same doc has info on the matter. Also see annotation configuration on the matter: https://docs.spring.io/spring-integration/docs/5.2.2.RELEASE/reference/html/configuration.html#annotations

Source https://stackoverflow.com/questions/59591119

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install cqengine

You can download it from GitHub.
You can use cqengine like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the cqengine component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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