dashmap | Blazing fast concurrent HashMap for Rust | Reactive Programming library

 by   xacrimon Rust Version: v5.4.0 License: MIT

kandi X-RAY | dashmap Summary

kandi X-RAY | dashmap Summary

dashmap is a Rust library typically used in Programming Style, Reactive Programming applications. dashmap has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

Blazingly fast concurrent map in Rust. DashMap is an implementation of a concurrent associative array/hashmap in Rust. DashMap tries to implement an easy to use API similar to std::collections::HashMap with some slight changes to handle concurrency. DashMap tries to be very simple to use and to be a direct replacement for RwLock>. To accomplish these goals, all methods take &self instead of modifying methods taking &mut self. This allows you to put a DashMap in an Arc and share it between threads while still being able to modify it. DashMap puts great effort into performance and aims to be as fast as possible. If you have any suggestions or tips do not hesitate to open an issue or a PR.
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            kandi-support Support

              dashmap has a medium active ecosystem.
              It has 2232 star(s) with 125 fork(s). There are 28 watchers for this library.
              OutlinedDot
              It had no major release in the last 12 months.
              There are 26 open issues and 142 have been closed. On average issues are closed in 65 days. There are 8 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of dashmap is v5.4.0

            kandi-Quality Quality

              dashmap has 0 bugs and 0 code smells.

            kandi-Security Security

              dashmap has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              dashmap code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              dashmap is licensed under the MIT License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              dashmap releases are available to install and integrate.

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            Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of dashmap
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            dashmap Key Features

            No Key Features are available at this moment for dashmap.

            dashmap Examples and Code Snippets

            No Code Snippets are available at this moment for dashmap.

            Community Discussions

            QUESTION

            UdpFramed with Actix Rust. Can't send messages using SinkWrite
            Asked 2022-Jan-09 at 22:09

            I'm trying to write a Udp Client Actor using Actix. I've followed this example, UDP-Echo, but I can't seem to send a message to the server using the UdpFramed tokio struct. Here's what I have so far, this is the Udp Client Actor implementation

            ...

            ANSWER

            Answered 2022-Jan-09 at 22:09

            Solved it by wrapping the UdpSocket in an Arc and keeping the reference in the actor for later use. Using the socket to write messages works. The split stream used for the streamhandler needs no change, as it works as expected.

            Source https://stackoverflow.com/questions/70560703

            QUESTION

            Hashmap value not updating on consecutive inserts [Rust]
            Asked 2021-Dec-19 at 12:34

            I have a struct that contains various Routers. Mostly hashmaps. But for this specific hashmap, the values are not updating after insertion. There is no delete function. Just an insert function(shown below).

            This is the main struct

            ...

            ANSWER

            Answered 2021-Dec-19 at 12:34

            Your closure unconditionally creates a new inner hashmap each time, which it uses as value in the outer hashmap. However, it inserts it into the outer hashmap under the same key (route.to_string()) all three times, which results in each insert overwriting the previous one(s).

            You need to implement a logic that will create a new inner hashmap only if one is missing under that key, otherwise look up the existing one. Then it should insert the value into the inner hashmap, either the freshly created one, or the one looked up. In Rust this is conveniently done using the entry API:

            Source https://stackoverflow.com/questions/70403603

            QUESTION

            Will these code produce a deadlock using Rust Dashmap?
            Asked 2021-Dec-10 at 10:08

            Will code like these ever produce a deadlock using a DashMap in Rust?

            ...

            ANSWER

            Answered 2021-Dec-10 at 10:08

            None of the examples will produce a deadlock.

            From the documentation:

            insert(): Inserts a key and a value into the map. Returns the old value associated with the key if there was one.
            Locking behaviour: May deadlock if called when holding any sort of reference into the map.

            iter(): Creates an iterator over a DashMap yielding immutable references.
            Locking behaviour: May deadlock if called when holding a mutable reference into the map.

            get_mut(): Get a mutable reference to an entry in the map
            Locking behaviour: May deadlock if called when holding any sort of reference into the map.

            Explanation:

            In your first two examples, only iter() is used, so as long as no other operations that take mutable references into the maps are used, there will be no deadlocks.

            In your third example, DashMap b is only ever used with iter() again, so no deadlocks there. For DashMap a there are two possible execution flows:

            1. If thread 1 reaches a.iter() first, then thread 2 will have to wait at a.get_mut(key), but once thread 1 has finished iterating over a thread 2 will be able to continue, so there will be no deadlock.
            2. If thread 2 reaches a.get_mut(key) first, then thread 1 will have to wait at a.iter() but once thread 2 has finished it will be able to continue and there will be no deadlock.

            Additional questions:

            Inserting into a DashMap when iterating over it in the same thread will produce a deadlock.

            Example:

            Source https://stackoverflow.com/questions/70299926

            QUESTION

            Threadsafe map-like access to values that only ever exist on one thread
            Asked 2021-Feb-24 at 19:52

            I have a struct which needs to be Send + Sync:

            ...

            ANSWER

            Answered 2021-Feb-24 at 19:52

            What I ended up doing here was using channels, but I was able to find a way to avoid needing to recreate the API of StateMachines.

            The technique is to use channels to pass a closure to a dedicated thread the StateMachines instances live on which accepts a &mut StateMachines argument, and sends the response back down a different channel, which lives on the stack while the access is happening.

            Here is a playground implementing the key part https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=e07972b928d0f0b7680b1e5a988dae84

            The details of instantiating the machines on their dedicated thread are elided.

            Source https://stackoverflow.com/questions/66234781

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

            Vulnerabilities

            No vulnerabilities reported

            Install dashmap

            You can download it from GitHub.
            Rust is installed and managed by the rustup tool. Rust has a 6-week rapid release process and supports a great number of platforms, so there are many builds of Rust available at any time. Please refer rust-lang.org for more information.

            Support

            DashMap gladly accepts contributions! Do not hesitate to open issues or PR's. I will take a look as soon as I have time for it. That said I do not get paid (yet) to work on open-source. This means that my time is limited and my work here comes after my personal life.
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            https://github.com/xacrimon/dashmap.git

          • CLI

            gh repo clone xacrimon/dashmap

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            git@github.com:xacrimon/dashmap.git

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