garbage-collection | SSM-based garbage sorting and recycling platform

 by   diaomina Java Version: Current License: No License

kandi X-RAY | garbage-collection Summary

kandi X-RAY | garbage-collection Summary

garbage-collection is a Java library. garbage-collection has no bugs, it has no vulnerabilities, it has build file available and it has high support. You can download it from GitHub.

SSM-based garbage sorting and recycling platform

            kandi-support Support

              garbage-collection has a highly active ecosystem.
              It has 26 star(s) with 15 fork(s). There are 3 watchers for this library.
              It had no major release in the last 6 months.
              There are 0 open issues and 4 have been closed. On average issues are closed in 493 days. There are 11 open pull requests and 0 closed requests.
              It has a negative sentiment in the developer community.
              The latest version of garbage-collection is current.

            kandi-Quality Quality

              garbage-collection has no bugs reported.

            kandi-Security Security

              garbage-collection has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

            kandi-License License

              garbage-collection does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              garbage-collection releases are not available. You will need to build from source code and install.
              Build file is available. You can build the component from source.

            Top functions reviewed by kandi - BETA

            kandi has reviewed garbage-collection and discovered the below as its top functions. This is intended to give you an instant insight into garbage-collection implemented functionality, and help decide if they suit your requirements.
            • Create a cart
            • Create new data
            • Update password
            • To center
            • To download user
            • Search for a user
            • Convert base64 string to image
            • Register a user
            • Add Goods to image
            • Main launcher
            • Log in admin
            • Convert an image URL to base64
            • Login with given username and password
            • To cart to cart
            • To order manager
            • Update Goods
            • Pay an order
            • To get the list of users to use
            • GET request
            • Gets the garbage order
            • Add cart to cart
            Get all kandi verified functions for this library.

            garbage-collection Key Features

            No Key Features are available at this moment for garbage-collection.

            garbage-collection Examples and Code Snippets

            No Code Snippets are available at this moment for garbage-collection.

            Community Discussions


            Is Java WeakReference the same as the swift weak keyword?
            Asked 2021-Jun-14 at 16:05

            I know there is a similar question has been answered in this post. However, I am still confused about whether java has the retain cycle problem as java also has the WeakReference class. So, are they serving the same purpose? What the difference between two of them?



            Answered 2021-Jun-14 at 16:05

            Java does not have the "retain cycle problem".

            This problem exists for systems that use reference counting, which the Java GC does not use.

            Therefore in Java the WeakReference class has nothing to do with those. It's simply a way to hold on to a reference to something while also not preventing it from being garbage collected

            In other words, you can use it to remember an object as long as something else (strongly) references it.

            This functionality is quite similar to what the weak keyword does in Swift. However, as described above, reference cycles don't stop objects from being collected in Java, so WeakReference is not needed in this specific case.

            This SO question lists some practical uses for weak references and this question discusses uses specifically in an Java/Android environment.



            How can you get the garbage collection policies for Google Cloud Bigtable?
            Asked 2021-May-25 at 00:28

            The docs for garbage collection explain how to set the garbage collection policies with cbt but don't explain how to read the policies. The cbt reference doesn't seem to have any command to get garbage collection either. As far as I can tell, this isn't available in the GUI.



            Answered 2021-May-25 at 00:28

            See this page about configuring garbage collection. It provides examples of how to set and update garbage-collection policies when you use Cloud Bigtable client libraries or the cbt command-line tool.

            The answer to your question is that you can view garbage collection policies of certain tables by running this cbt command:



            How to remove nested object form apollo cache?
            Asked 2021-May-13 at 01:24

            Official doc says remove cache data using cache.evict(), but there are no explanation about nested object. For example, let's think abount ROOT_QUERY like below.



            Answered 2021-May-13 at 01:24

            You can use cache.modify for nested object.



            How to add a colorbar to seaborn boxplot?
            Asked 2021-Mar-17 at 19:38

            I made a boxplot using seaborn.boxplot(). The x axis ranges from -0.95 to 0.95. Because the values on the x axis are important, I would like to create a colorbar that matches these values. Using plt.colorbar(), I got the following error message 'RuntimeError: No mappable was found to use for colorbar creation. First define a mappable such as an image (with imshow) or a contour set (with contourf)'. Searching for solutions on stackoverflow, I found matplotlib colorbar not working (due to garbage collection?), Matplotlib: Creating Colorbar. I gave them a try but I'm generating more errors, suggesting that I'm not doing the right thing. Therefore, I really would appreciate if someone could help me out and teach me how to do it properly. Thank you in advance for your time and sharing knowledge.



            Answered 2021-Mar-17 at 19:38

            You can add a custom colorbar with cm.ScalarMappable



            Is it possible, that DisposeAsync method is called in parallel?
            Asked 2021-Mar-11 at 17:19

            Taking the following code from the official documentation:



            Answered 2021-Mar-11 at 15:02

            Yes, it is possible to have concurrent DisposeAsync calls. It is also possible to have concurrent Dispose calls. Technically, implementations are supposed to handle this properly, but in real-world code, it's very rare to have concurrent Dispose or DisposeAsync calls, so most implementations do not handle this correctly.

            If this is a source of concern, I recommend using my Disposables library, which ensures exactly-once semantics on disposal. However, it is written from the assumption that types want to implement IAsyncDisposable or IDisposable, and not both.



            How classloader leak is occured
            Asked 2021-Mar-09 at 07:37

            I am sorry to ask you this basic question but I am not able to understand the concept. I read many SO post but I could not understand. Could you please give me code example to understand.

            1. As said in this post

            Static variables cannot be elected for garbage collection while the class is loaded. They can be collected when the respective class loader (that was responsible for loading this class) is itself collected for garbage.

            I understand as per theory that Classloader cannot be collected if it has a reference but I do not understand how it is possible practically. Could you please kindly explain with a code example?

            Many thanks for your help!



            Answered 2021-Mar-08 at 21:10

            I am posting my understanding hope it helps, Background understanding: Simple way to understand this is to take an example of a Tomcat or any such application. Which is java based. Tomcat can run multiple webapps. Even if you deploy same application with different name they will be treated differently. Here these both applications will have same classes but still they are treated differently. So here comes the class loaders. So you can think in a way like Tomcat is creating a class loader for each application and loading them under it.

            Reclaiming of loaders: above if Tomcat is holding reference to the loader object then the loader object will not be reclaimed. And unless loader gets garbage collected the classes loaded by it stays. So if you shutdown an application, Tomcat will ultimately drefrence it's respective loader so that gc can reclaim it an clean it including the classed loaded by it.

            Quick links that may help:,that%20class%20are%20still%20reachable.




            Algorithm to have garbage collection when compiling to c
            Asked 2021-Feb-26 at 15:20

            I need some sort of algorithm to add garbage collection to my language (which is being compiled to c) and add a free statement or some other way so that it will have no memory leaks.

            Yes, I looked at Garbage collection when compiling to C, but I do not understand the answer, and was hoping to get a more detailed answer on how to do it.

            EDIT: for example if the code is



            Answered 2021-Feb-26 at 07:32

            You first need to read the garbage collection handbook.

            You later need to document, in written English, the conventions and invariants of your garbage collector. Is it a generational GC? Is it multi-thread friendly? Is it precise or conservative?

            The book by C.Queinnec Lisp In Small Pieces is helpful. It describes how to code various Lisp interpreters, and some Lisp to C compiler. Some chapters are related to garbage collection and their relation to generated C code.

            The Dragon book (about compilation) has a chapter on GC.

            A.Appel's book Compiling with Continuations is also helpful.

            You then could document and probably define macros implementing your GC conventions.

            Notice that malloc could be considered as a slow way of allocating garbage collected data. Read for example Appel's old paper Garbage Collection can be faster than Stack allocation (it was debated later, but it does give a good intuition). You could consider fetching large memory zones with mmap(2) and allocating inside them in some faster way. Then you won't free individual garbage values (if you adopt a copying GC strategy, using Cheney's algorithm), but will munmap(2) a large memory zone at once. Study also the C source code of malloc implementation inside GNU libc or musl libc.

            See my Bismon project as an example of C code (open source, for Linux) with GC.

            Look also inside the C code of Ocaml interpreter and compiler.

            Or inside the C runtime of SBCL or of Chicken/Scheme.

            Or inside the code of some open source JVM.

            The Bigloo project is a Lisp to C compiler.

            The GNU emacs editor contains a garbage collector. The GCC compiler also contains one.

            Circular references are difficult to handle with reference counting schemes.

            Consider also using Boehm conservative garbage collector open source library.

            Your GC will be operating system specific, and probably target processor specific.

            The RefPerSys project (in C++, with generation of C++ code at runtime) has a GC.

            At last, the valgrind utility (a tool to detect memory leaks) is open source and can be considered as containing some GC.

            Read also recent papers submitted to ACM SIGPLAN conferences. Several of them are related to garbage collection. Consider later submitting your own paper on GC.

            Budget several years of full time work.

            PS. As an introduction, read the old paper by P.Wilson Uniprocessor Garbage Collection Techniques



            C# - can a string be stored in the Large Object Heap (LOH)?
            Asked 2021-Feb-24 at 21:29

            Recently I was asked in the interview, if the strings in C# can come to the LOH. The interviewer mentioned that there is some optimization in GC logic that splits a single massive string into several smaller ones, so this string never reaches LOH.

            I didn't find the related info in MSDN articles:  and

            So are there any implications or optimizations in CLR regarding storing strings in LOH? Is it somehow related to string interning?



            Answered 2021-Feb-24 at 21:29

            I think the interviewer wanted to hear about String Intern Pool also as known as LargeHeapHandleTable.

            One of the mistake is to assume that interned string is located in String Intern Pool in LOH.

            In reality, an interned string has a hash, which is located in LargeHeapHandleTable, and then it references to Small Object Heap(SOH) or Large Object Heap(LOH).

            if an interned string more than 85kb the string will be located in LOH, in other cases it will be in 2 generation in SOH and would be stored until the application has finished.

            [The example of interned string]

            It is described in chapter 4 Pro .Net Memory Management by Kondrad Kokosa



            How to deal with memory leak in Ruby/Rails
            Asked 2021-Jan-22 at 02:12

            I'm developping a Rails application that deals with huge amounts of data and it halts since it uses all memory of my computer due to memory leak (allocated objects that are not released).

            In my application, data is organized in a hierarchical way, as a tree, where each node of level "X" contains the sum of data of level "X+1". For example if the data of level "X+1" contains the amount of people in cities, level "X" contains the amount of people in states. In this way, level "X"'s data is obtained by summing up the amount of data in level "X+1" (in this case, people).

            For the sake of this question, consider a tree with four levels: country, State, City and Neighbourhoods and that each level is mapped into Activerecords tables (countries, states, cities, neighbourhoods).

            Data is read from a csv file that fills the leaves of the tree, that is, the neighbourhoods table.

            Afetr that, data flows from bottom (neighbourhoods) to top (countries) in the following sequence:



            Answered 2021-Jan-22 at 02:12

            This isn't really a case of a memory leak. You're just indescrimely loading data off the table which will exhaust the available memory.

            The solution is to load the data off the database in batches:



            If the Garbage Collector suspends all managed threads, why does this code cause a System.OutOfMemoryException?
            Asked 2020-Nov-29 at 10:20

            According to Fundamentals of garbage collection, all threads except the one that triggered the garbage collection are suspended during garbage collection. Since the finalizers are called during the garbage collection process, I would expect the thread to be suspended until all the finalizers are executed. Thus, I would expect the following code to just "take longer" to complete. Instead, it throws a System.OutOfMemoryException. Could someone elaborate on why this happens?



            Answered 2020-Nov-29 at 10:20

            Okay, so I did some more research, and it turns out that the garbage collector does not call the finalizers synchronously. It does the following:

            1. Freezes all running threads.
            2. Adds items that need finalization to the finalizer queue.
            3. Performs garbage collection on eligible objects (objects with no finalizers or with finalizers already called.)
            4. Thaws the threads that it froze.

            After that, the finalizer thread starts running in the background along with the rest of the application, and calls the finalizers of each object in its queue. This is where the issue I described arises. The Person objects in the heap have their references moved into the finalization queue, but their memory is not freed up until the finalization actually happens. The finalization takes place while the application is running (and more objects are created on the heap).

            The garbage collector cannot reclaim the memory until finalization is over, thus, a race condition arises between the Main Thread (creating the objects) and the GC Finalizer Thread (calling the finalizers).

            I have also confirmed this behaviour by debugging the IL code and seeing the execution switch between the two threads described above.

            I have also found this question on SO which describes the same behaviour.


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


            No vulnerabilities reported

            Install garbage-collection

            You can download it from GitHub.
            You can use garbage-collection 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 garbage-collection 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 For Gradle installation, please refer .


            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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