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Fragmentation | A powerful library that manage Fragment for Android | Architecture library

 by   YoKeyword Java Version: 1.3.7 License: Apache-2.0

 by   YoKeyword Java Version: 1.3.7 License: Apache-2.0

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kandi X-RAY | Fragmentation Summary

Fragmentation is a Java library typically used in Architecture applications. Fragmentation has no vulnerabilities, it has build file available, it has a Permissive License and it has medium support. However Fragmentation has 4 bugs. You can download it from GitHub.
Fragmentation is a powerful library managing Fragment for Android. It is designed for "Single Activity + Multi-Fragments" and "Multi-FragmentActivities + Multi-Fragments" architecture to simplify development process.
Support
Support
Quality
Quality
Security
Security
License
License
Reuse
Reuse

kandi-support Support

  • Fragmentation has a medium active ecosystem.
  • It has 9684 star(s) with 2126 fork(s). There are 308 watchers for this library.
  • It had no major release in the last 12 months.
  • There are 187 open issues and 1032 have been closed. On average issues are closed in 69 days. There are 2 open pull requests and 0 closed requests.
  • It has a neutral sentiment in the developer community.
  • The latest version of Fragmentation is 1.3.7
Fragmentation Support
Best in #Architecture
Average in #Architecture
Fragmentation Support
Best in #Architecture
Average in #Architecture

quality kandi Quality

  • Fragmentation has 4 bugs (0 blocker, 0 critical, 1 major, 3 minor) and 328 code smells.
Fragmentation Quality
Best in #Architecture
Average in #Architecture
Fragmentation Quality
Best in #Architecture
Average in #Architecture

securitySecurity

  • Fragmentation has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
  • Fragmentation code analysis shows 0 unresolved vulnerabilities.
  • There are 15 security hotspots that need review.
Fragmentation Security
Best in #Architecture
Average in #Architecture
Fragmentation Security
Best in #Architecture
Average in #Architecture

license License

  • Fragmentation 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.
Fragmentation License
Best in #Architecture
Average in #Architecture
Fragmentation License
Best in #Architecture
Average in #Architecture

buildReuse

  • Fragmentation releases are available to install and integrate.
  • Build file is available. You can build the component from source.
  • Installation instructions are not available. Examples and code snippets are available.
  • Fragmentation saves you 5218 person hours of effort in developing the same functionality from scratch.
  • It has 10961 lines of code, 1056 functions and 204 files.
  • It has medium code complexity. Code complexity directly impacts maintainability of the code.
Fragmentation Reuse
Best in #Architecture
Average in #Architecture
Fragmentation Reuse
Best in #Architecture
Average in #Architecture
Top functions reviewed by kandi - BETA

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

  • Called when a navigation item is selected .
  • Set the view .
  • Mock a view to an animator .
  • Initialize the view .
  • toggles view .
  • On menu item clicked .
  • returns a list of views that are not currently active
  • print all fragment records
  • Validate edge size .
  • Set the support visible flag .

Fragmentation Key Features

[DEPRECATED] A powerful library that manage Fragment for Android

Note: This is the use of androidx, if you are using the android.support,

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// This is the use of androidx, if you are using the android.support: fragmentationx -> fragmentation
implementation 'me.yokeyword:fragmentationx:1.0.2'

// If you don't want to extends SupportActivity/Fragment and would like to customize your own support, just rely on fragmentation-core
// implementation 'me.yokeyword:fragmentationx-core:1.0.2'

// To get SwipeBack feature, rely on both fragmentation & fragmentation-swipeback
implementation 'me.yokeyword:fragmentationx:1.0.2'
// Swipeback is based on fragmentation. Refer to SwipeBackActivity/Fragment for your Customized SupportActivity/Fragment
implementation 'me.yokeyword:fragmentationx-swipeback:1.0.2'

// To simplify the communication between Fragments.
implementation 'me.yokeyword:eventbus-activity-scope:1.1.0'
// Your EventBus's version
implementation 'org.greenrobot:eventbus:{version}'

LICENSE

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Copyright 2016 YoKey

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

Improving Haskell performance for small GET requests

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stack install
my-cli-exe
        HS (stack install)  HS (stack run)   Python    Curl
real:   373 ms              1017 ms          568 ms    214 ms
user:   222 ms              1062 ms          367 ms    26 ms
sys:    141 ms              210 ms           45 ms     10 ms
-----------------------
stack install
my-cli-exe
        HS (stack install)  HS (stack run)   Python    Curl
real:   373 ms              1017 ms          568 ms    214 ms
user:   222 ms              1062 ms          367 ms    26 ms
sys:    141 ms              210 ms           45 ms     10 ms

Receiving large binary data over Boost::Beast websocket

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std::string data(boost::beast::buffers_to_string(m_buffer.data()));
    callback(data);
ws.read_message_max(20ull << 20); // sets the limit to 20 miB
-----------------------
std::string data(boost::beast::buffers_to_string(m_buffer.data()));
    callback(data);
ws.read_message_max(20ull << 20); // sets the limit to 20 miB
-----------------------
std::string data(boost::beast::buffers_to_string(m_buffer.data()));
    callback(data);
ws.read_message_max(20ull << 20); // sets the limit to 20 miB

I'm trying to do a best fit algorithm in python in OS

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from copy import copy

def bestFit(blockSize,m,jobSize,n):
    allocation=[-1] * n
    memorySize=copy(blockSize)
...

Why does adding audio stream to ffmpeg's libavcodec output container cause a crash?

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[mp4 @ 0x2b39f40] sample rate not set 0
#0  0x00007ffff75253d7 in raise () from /lib64/libc.so.6
#1  0x00007ffff7526ac8 in abort () from /lib64/libc.so.6
#2  0x000000000094feca in init_muxer (s=0x2b39f40, options=0x0) at libavformat/mux.c:309
#3  0x00000000009508f4 in avformat_init_output (s=0x2b39f40, options=0x0) at libavformat/mux.c:490
#4  0x0000000000950a10 in avformat_write_header (s=0x2b39f40, options=0x0) at libavformat/mux.c:514
[...]
        case AVMEDIA_TYPE_AUDIO:
            if (par->sample_rate <= 0) {
                av_log(s, AV_LOG_ERROR, "sample rate not set %d\n", par->sample_rate); abort();
                ret = AVERROR(EINVAL);
                goto fail;
            }
m_output_audio_stream->codecpar->sample_rate =
  m_format_context->streams[m_audio_stream_index]->codecpar->sample_rate;
#0  0x00000000009516db in compute_muxer_pkt_fields (s=0x2b39f40, st=0x2b3a580, pkt=0x7fffffffe2d0) at libavformat/mux.c:632
#1  0x0000000000953128 in write_packet_common (s=0x2b39f40, st=0x2b3a580, pkt=0x7fffffffe2d0, interleaved=1) at libavformat/mux.c:1125
#2  0x0000000000953473 in write_packets_common (s=0x2b39f40, pkt=0x7fffffffe2d0, interleaved=1) at libavformat/mux.c:1188
#3  0x0000000000953634 in av_interleaved_write_frame (s=0x2b39f40, pkt=0x7fffffffe2d0) at libavformat/mux.c:1243
[...]
    if (s->oformat->init && ret) {
        if ((ret = init_pts(s)) < 0)
            return ret;
        
        return AVSTREAM_INIT_IN_INIT_OUTPUT;
    }
    if (!s->internal->streams_initialized) {
       if ((ret = init_pts(s)) < 0)
          goto fail;
    }
-----------------------
[mp4 @ 0x2b39f40] sample rate not set 0
#0  0x00007ffff75253d7 in raise () from /lib64/libc.so.6
#1  0x00007ffff7526ac8 in abort () from /lib64/libc.so.6
#2  0x000000000094feca in init_muxer (s=0x2b39f40, options=0x0) at libavformat/mux.c:309
#3  0x00000000009508f4 in avformat_init_output (s=0x2b39f40, options=0x0) at libavformat/mux.c:490
#4  0x0000000000950a10 in avformat_write_header (s=0x2b39f40, options=0x0) at libavformat/mux.c:514
[...]
        case AVMEDIA_TYPE_AUDIO:
            if (par->sample_rate <= 0) {
                av_log(s, AV_LOG_ERROR, "sample rate not set %d\n", par->sample_rate); abort();
                ret = AVERROR(EINVAL);
                goto fail;
            }
m_output_audio_stream->codecpar->sample_rate =
  m_format_context->streams[m_audio_stream_index]->codecpar->sample_rate;
#0  0x00000000009516db in compute_muxer_pkt_fields (s=0x2b39f40, st=0x2b3a580, pkt=0x7fffffffe2d0) at libavformat/mux.c:632
#1  0x0000000000953128 in write_packet_common (s=0x2b39f40, st=0x2b3a580, pkt=0x7fffffffe2d0, interleaved=1) at libavformat/mux.c:1125
#2  0x0000000000953473 in write_packets_common (s=0x2b39f40, pkt=0x7fffffffe2d0, interleaved=1) at libavformat/mux.c:1188
#3  0x0000000000953634 in av_interleaved_write_frame (s=0x2b39f40, pkt=0x7fffffffe2d0) at libavformat/mux.c:1243
[...]
    if (s->oformat->init && ret) {
        if ((ret = init_pts(s)) < 0)
            return ret;
        
        return AVSTREAM_INIT_IN_INIT_OUTPUT;
    }
    if (!s->internal->streams_initialized) {
       if ((ret = init_pts(s)) < 0)
          goto fail;
    }
-----------------------
[mp4 @ 0x2b39f40] sample rate not set 0
#0  0x00007ffff75253d7 in raise () from /lib64/libc.so.6
#1  0x00007ffff7526ac8 in abort () from /lib64/libc.so.6
#2  0x000000000094feca in init_muxer (s=0x2b39f40, options=0x0) at libavformat/mux.c:309
#3  0x00000000009508f4 in avformat_init_output (s=0x2b39f40, options=0x0) at libavformat/mux.c:490
#4  0x0000000000950a10 in avformat_write_header (s=0x2b39f40, options=0x0) at libavformat/mux.c:514
[...]
        case AVMEDIA_TYPE_AUDIO:
            if (par->sample_rate <= 0) {
                av_log(s, AV_LOG_ERROR, "sample rate not set %d\n", par->sample_rate); abort();
                ret = AVERROR(EINVAL);
                goto fail;
            }
m_output_audio_stream->codecpar->sample_rate =
  m_format_context->streams[m_audio_stream_index]->codecpar->sample_rate;
#0  0x00000000009516db in compute_muxer_pkt_fields (s=0x2b39f40, st=0x2b3a580, pkt=0x7fffffffe2d0) at libavformat/mux.c:632
#1  0x0000000000953128 in write_packet_common (s=0x2b39f40, st=0x2b3a580, pkt=0x7fffffffe2d0, interleaved=1) at libavformat/mux.c:1125
#2  0x0000000000953473 in write_packets_common (s=0x2b39f40, pkt=0x7fffffffe2d0, interleaved=1) at libavformat/mux.c:1188
#3  0x0000000000953634 in av_interleaved_write_frame (s=0x2b39f40, pkt=0x7fffffffe2d0) at libavformat/mux.c:1243
[...]
    if (s->oformat->init && ret) {
        if ((ret = init_pts(s)) < 0)
            return ret;
        
        return AVSTREAM_INIT_IN_INIT_OUTPUT;
    }
    if (!s->internal->streams_initialized) {
       if ((ret = init_pts(s)) < 0)
          goto fail;
    }
-----------------------
[mp4 @ 0x2b39f40] sample rate not set 0
#0  0x00007ffff75253d7 in raise () from /lib64/libc.so.6
#1  0x00007ffff7526ac8 in abort () from /lib64/libc.so.6
#2  0x000000000094feca in init_muxer (s=0x2b39f40, options=0x0) at libavformat/mux.c:309
#3  0x00000000009508f4 in avformat_init_output (s=0x2b39f40, options=0x0) at libavformat/mux.c:490
#4  0x0000000000950a10 in avformat_write_header (s=0x2b39f40, options=0x0) at libavformat/mux.c:514
[...]
        case AVMEDIA_TYPE_AUDIO:
            if (par->sample_rate <= 0) {
                av_log(s, AV_LOG_ERROR, "sample rate not set %d\n", par->sample_rate); abort();
                ret = AVERROR(EINVAL);
                goto fail;
            }
m_output_audio_stream->codecpar->sample_rate =
  m_format_context->streams[m_audio_stream_index]->codecpar->sample_rate;
#0  0x00000000009516db in compute_muxer_pkt_fields (s=0x2b39f40, st=0x2b3a580, pkt=0x7fffffffe2d0) at libavformat/mux.c:632
#1  0x0000000000953128 in write_packet_common (s=0x2b39f40, st=0x2b3a580, pkt=0x7fffffffe2d0, interleaved=1) at libavformat/mux.c:1125
#2  0x0000000000953473 in write_packets_common (s=0x2b39f40, pkt=0x7fffffffe2d0, interleaved=1) at libavformat/mux.c:1188
#3  0x0000000000953634 in av_interleaved_write_frame (s=0x2b39f40, pkt=0x7fffffffe2d0) at libavformat/mux.c:1243
[...]
    if (s->oformat->init && ret) {
        if ((ret = init_pts(s)) < 0)
            return ret;
        
        return AVSTREAM_INIT_IN_INIT_OUTPUT;
    }
    if (!s->internal->streams_initialized) {
       if ((ret = init_pts(s)) < 0)
          goto fail;
    }
-----------------------
[mp4 @ 0x2b39f40] sample rate not set 0
#0  0x00007ffff75253d7 in raise () from /lib64/libc.so.6
#1  0x00007ffff7526ac8 in abort () from /lib64/libc.so.6
#2  0x000000000094feca in init_muxer (s=0x2b39f40, options=0x0) at libavformat/mux.c:309
#3  0x00000000009508f4 in avformat_init_output (s=0x2b39f40, options=0x0) at libavformat/mux.c:490
#4  0x0000000000950a10 in avformat_write_header (s=0x2b39f40, options=0x0) at libavformat/mux.c:514
[...]
        case AVMEDIA_TYPE_AUDIO:
            if (par->sample_rate <= 0) {
                av_log(s, AV_LOG_ERROR, "sample rate not set %d\n", par->sample_rate); abort();
                ret = AVERROR(EINVAL);
                goto fail;
            }
m_output_audio_stream->codecpar->sample_rate =
  m_format_context->streams[m_audio_stream_index]->codecpar->sample_rate;
#0  0x00000000009516db in compute_muxer_pkt_fields (s=0x2b39f40, st=0x2b3a580, pkt=0x7fffffffe2d0) at libavformat/mux.c:632
#1  0x0000000000953128 in write_packet_common (s=0x2b39f40, st=0x2b3a580, pkt=0x7fffffffe2d0, interleaved=1) at libavformat/mux.c:1125
#2  0x0000000000953473 in write_packets_common (s=0x2b39f40, pkt=0x7fffffffe2d0, interleaved=1) at libavformat/mux.c:1188
#3  0x0000000000953634 in av_interleaved_write_frame (s=0x2b39f40, pkt=0x7fffffffe2d0) at libavformat/mux.c:1243
[...]
    if (s->oformat->init && ret) {
        if ((ret = init_pts(s)) < 0)
            return ret;
        
        return AVSTREAM_INIT_IN_INIT_OUTPUT;
    }
    if (!s->internal->streams_initialized) {
       if ((ret = init_pts(s)) < 0)
          goto fail;
    }
-----------------------
[mp4 @ 0x2b39f40] sample rate not set 0
#0  0x00007ffff75253d7 in raise () from /lib64/libc.so.6
#1  0x00007ffff7526ac8 in abort () from /lib64/libc.so.6
#2  0x000000000094feca in init_muxer (s=0x2b39f40, options=0x0) at libavformat/mux.c:309
#3  0x00000000009508f4 in avformat_init_output (s=0x2b39f40, options=0x0) at libavformat/mux.c:490
#4  0x0000000000950a10 in avformat_write_header (s=0x2b39f40, options=0x0) at libavformat/mux.c:514
[...]
        case AVMEDIA_TYPE_AUDIO:
            if (par->sample_rate <= 0) {
                av_log(s, AV_LOG_ERROR, "sample rate not set %d\n", par->sample_rate); abort();
                ret = AVERROR(EINVAL);
                goto fail;
            }
m_output_audio_stream->codecpar->sample_rate =
  m_format_context->streams[m_audio_stream_index]->codecpar->sample_rate;
#0  0x00000000009516db in compute_muxer_pkt_fields (s=0x2b39f40, st=0x2b3a580, pkt=0x7fffffffe2d0) at libavformat/mux.c:632
#1  0x0000000000953128 in write_packet_common (s=0x2b39f40, st=0x2b3a580, pkt=0x7fffffffe2d0, interleaved=1) at libavformat/mux.c:1125
#2  0x0000000000953473 in write_packets_common (s=0x2b39f40, pkt=0x7fffffffe2d0, interleaved=1) at libavformat/mux.c:1188
#3  0x0000000000953634 in av_interleaved_write_frame (s=0x2b39f40, pkt=0x7fffffffe2d0) at libavformat/mux.c:1243
[...]
    if (s->oformat->init && ret) {
        if ((ret = init_pts(s)) < 0)
            return ret;
        
        return AVSTREAM_INIT_IN_INIT_OUTPUT;
    }
    if (!s->internal->streams_initialized) {
       if ((ret = init_pts(s)) < 0)
          goto fail;
    }
-----------------------
[mp4 @ 0x2b39f40] sample rate not set 0
#0  0x00007ffff75253d7 in raise () from /lib64/libc.so.6
#1  0x00007ffff7526ac8 in abort () from /lib64/libc.so.6
#2  0x000000000094feca in init_muxer (s=0x2b39f40, options=0x0) at libavformat/mux.c:309
#3  0x00000000009508f4 in avformat_init_output (s=0x2b39f40, options=0x0) at libavformat/mux.c:490
#4  0x0000000000950a10 in avformat_write_header (s=0x2b39f40, options=0x0) at libavformat/mux.c:514
[...]
        case AVMEDIA_TYPE_AUDIO:
            if (par->sample_rate <= 0) {
                av_log(s, AV_LOG_ERROR, "sample rate not set %d\n", par->sample_rate); abort();
                ret = AVERROR(EINVAL);
                goto fail;
            }
m_output_audio_stream->codecpar->sample_rate =
  m_format_context->streams[m_audio_stream_index]->codecpar->sample_rate;
#0  0x00000000009516db in compute_muxer_pkt_fields (s=0x2b39f40, st=0x2b3a580, pkt=0x7fffffffe2d0) at libavformat/mux.c:632
#1  0x0000000000953128 in write_packet_common (s=0x2b39f40, st=0x2b3a580, pkt=0x7fffffffe2d0, interleaved=1) at libavformat/mux.c:1125
#2  0x0000000000953473 in write_packets_common (s=0x2b39f40, pkt=0x7fffffffe2d0, interleaved=1) at libavformat/mux.c:1188
#3  0x0000000000953634 in av_interleaved_write_frame (s=0x2b39f40, pkt=0x7fffffffe2d0) at libavformat/mux.c:1243
[...]
    if (s->oformat->init && ret) {
        if ((ret = init_pts(s)) < 0)
            return ret;
        
        return AVSTREAM_INIT_IN_INIT_OUTPUT;
    }
    if (!s->internal->streams_initialized) {
       if ((ret = init_pts(s)) < 0)
          goto fail;
    }

Which order should allocated memory blocks be freed in?

copy iconCopydownload iconDownload
    char *a = malloc(m);
    if (a) {
        char *b = malloc(n);
        if (b) {
            char *c = malloc(o);
            if (c) {
                //...
                free(c);
            }
            free(b);
        }
        free(a);
    }

In the same code, listview appears in activity, but listview does not appear in fragment

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   ArrayAdapter<String> adapter = new ArrayAdapter<>(getActivity(), android.R.layout.simple_list_item_1);

    adapter.add("Adam Smith");
    adapter.add("Bryan Adams");
    adapter.add("Chris Martin");
    adapter.add("Daniel Craig");
    adapter.add("Eric Clapton");
    adapter.add("Frank Sinatra");

    lv_search = (ListView) view.findViewById(R.id.lv_search);
    lv_search.setAdapter(adapter);

    

Struggling with BeautifulSoup and tags

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from bs4 import BeautifulSoup
import requests

URL = 'https://en.m.wikipedia.org/wiki/List_of_methods_of_torture'
page = requests.get(URL)

html_soup = BeautifulSoup(page.content, 'html.parser')

sections = html_soup.find_all("section")
torture_methods = sections[1].find_all("li")
torture_method_names = list(map(lambda x: x.text, torture_methods))
print(torture_method_names)
['Ego-Fragmentation', 'Learned Helplessness', 'Chinese water torture', 'Welcome parade (torture)']
-----------------------
from bs4 import BeautifulSoup
import requests

URL = 'https://en.m.wikipedia.org/wiki/List_of_methods_of_torture'
page = requests.get(URL)

html_soup = BeautifulSoup(page.content, 'html.parser')

sections = html_soup.find_all("section")
torture_methods = sections[1].find_all("li")
torture_method_names = list(map(lambda x: x.text, torture_methods))
print(torture_method_names)
['Ego-Fragmentation', 'Learned Helplessness', 'Chinese water torture', 'Welcome parade (torture)']
-----------------------
from bs4 import BeautifulSoup
import requests

URL = 'https://en.m.wikipedia.org/wiki/List_of_methods_of_torture'
page = requests.get(URL)

html_soup = BeautifulSoup(page.content, 'html.parser')
print(html_soup.prettify())


print ([x.text for x in html_soup.find("section", class_="mf-section-1").find_all('a')])
-----------------------
from bs4 import BeautifulSoup
import requests

URL = 'https://en.m.wikipedia.org/wiki/List_of_methods_of_torture'
page = requests.get(URL)

html_soup = BeautifulSoup(page.content, 'html.parser')
type(html_soup)

print (''.join(html_soup.find("section", class_="mf-section-1").findAll(text=True)).lstrip("\n"))
Ego-Fragmentation
Learned Helplessness
Chinese water torture
Welcome parade (torture)
-----------------------
from bs4 import BeautifulSoup
import requests

URL = 'https://en.m.wikipedia.org/wiki/List_of_methods_of_torture'
page = requests.get(URL)

html_soup = BeautifulSoup(page.content, 'html.parser')
type(html_soup)

print (''.join(html_soup.find("section", class_="mf-section-1").findAll(text=True)).lstrip("\n"))
Ego-Fragmentation
Learned Helplessness
Chinese water torture
Welcome parade (torture)

Checking multiple cell locations using target.address with embedded if statements

copy iconCopydownload iconDownload
Private Sub Worksheet_Change(ByVal Target As Range)
    
    Dim vType, vSubtype

    'change cylindrical/spherical vessel image based on user selection
    If Target.Address = "$D$9" Or Target.Address = "$D$36" Then
        
        vType = Me.Range("D9").Value
        vSubtype = Me.Range("D36").Value
        
        PVtype.Visible = (vType = "Cylindrical")
        PVSPH.Visible = (vType = "Spherical")
        
        If vType = "Cylindrical" Then
            CYL_SPLIT.Visible = (vSubtype = "Center Split")
            CYL_EC.Visible = (vSubtype = "End Cap")
            CYL_MF.Visible = (vSubtype = "Multi-frag")
            SPH_SPLIT.Visible = False
            SPH_EC.Visible = False
            SPH_MF.Visible = False
        ElseIf vType = "Spherical" Then
            CYL_SPLIT.Visible = False
            CYL_EC.Visible = False
            CYL_MF.Visible = False
            SPH_SPLIT.Visible = (vSubtype = "Center Split")
            SPH_EC.Visible = (vSubtype = "End Cap")
            SPH_MF.Visible = (vSubtype = "Multi-frag")
        Else
            'set all to not visible
        End If
    End If
   
End Sub

Subscribing to value changes inside child objects of environment view models (view not being re-rendered when this happens)

copy iconCopydownload iconDownload
import Combine

public class ViewModel: ObservableObject {

    @Published var nav = NavigationViewModel()
    var anyCancellable: AnyCancellable?

    init() {
        anyCancellable = nav.objectWillChange.sink { _ in
            self.objectWillChange.send()
        }
    }
}
class NavigationViewModel: ObservableObject {

    static let shared = NavigationViewModel()
    private init() {}

    @Published var currentScreen: Screen = .Timeline     
}
public class ViewModel: ObservableObject {

    var nav: NavigationViewModel { NavigationViewModel.shared }
}
struct ContentView: View {

    @StateObject var navigationModel = NavigationModel.shared
}
@Published var currentScreen: Screen = .Timeline {
    didSet { 
        objectWillChange.send()
    }
}
-----------------------
import Combine

public class ViewModel: ObservableObject {

    @Published var nav = NavigationViewModel()
    var anyCancellable: AnyCancellable?

    init() {
        anyCancellable = nav.objectWillChange.sink { _ in
            self.objectWillChange.send()
        }
    }
}
class NavigationViewModel: ObservableObject {

    static let shared = NavigationViewModel()
    private init() {}

    @Published var currentScreen: Screen = .Timeline     
}
public class ViewModel: ObservableObject {

    var nav: NavigationViewModel { NavigationViewModel.shared }
}
struct ContentView: View {

    @StateObject var navigationModel = NavigationModel.shared
}
@Published var currentScreen: Screen = .Timeline {
    didSet { 
        objectWillChange.send()
    }
}
-----------------------
import Combine

public class ViewModel: ObservableObject {

    @Published var nav = NavigationViewModel()
    var anyCancellable: AnyCancellable?

    init() {
        anyCancellable = nav.objectWillChange.sink { _ in
            self.objectWillChange.send()
        }
    }
}
class NavigationViewModel: ObservableObject {

    static let shared = NavigationViewModel()
    private init() {}

    @Published var currentScreen: Screen = .Timeline     
}
public class ViewModel: ObservableObject {

    var nav: NavigationViewModel { NavigationViewModel.shared }
}
struct ContentView: View {

    @StateObject var navigationModel = NavigationModel.shared
}
@Published var currentScreen: Screen = .Timeline {
    didSet { 
        objectWillChange.send()
    }
}
-----------------------
import Combine

public class ViewModel: ObservableObject {

    @Published var nav = NavigationViewModel()
    var anyCancellable: AnyCancellable?

    init() {
        anyCancellable = nav.objectWillChange.sink { _ in
            self.objectWillChange.send()
        }
    }
}
class NavigationViewModel: ObservableObject {

    static let shared = NavigationViewModel()
    private init() {}

    @Published var currentScreen: Screen = .Timeline     
}
public class ViewModel: ObservableObject {

    var nav: NavigationViewModel { NavigationViewModel.shared }
}
struct ContentView: View {

    @StateObject var navigationModel = NavigationModel.shared
}
@Published var currentScreen: Screen = .Timeline {
    didSet { 
        objectWillChange.send()
    }
}
-----------------------
import Combine

public class ViewModel: ObservableObject {

    @Published var nav = NavigationViewModel()
    var anyCancellable: AnyCancellable?

    init() {
        anyCancellable = nav.objectWillChange.sink { _ in
            self.objectWillChange.send()
        }
    }
}
class NavigationViewModel: ObservableObject {

    static let shared = NavigationViewModel()
    private init() {}

    @Published var currentScreen: Screen = .Timeline     
}
public class ViewModel: ObservableObject {

    var nav: NavigationViewModel { NavigationViewModel.shared }
}
struct ContentView: View {

    @StateObject var navigationModel = NavigationModel.shared
}
@Published var currentScreen: Screen = .Timeline {
    didSet { 
        objectWillChange.send()
    }
}

Getting response in desired format with postgreSQL

copy iconCopydownload iconDownload
  select courses.course_id as id, courses.course_name as name, courses.course_duration as 
  duration, courses.course_description as description,
  jsonb_agg(
      jsonb_build_object(
          'id',          topics.topic_id,
          'name',        topics.topic_name,
          'duration',    topics.topic_duration,
          'sequence_no',   topics.sequence_no,
          'description', topics.topic_description,
          'subtopics',   subtopic.subtopics,
          'assessments', assessments.assessments
      )
      order by topics.topic_id
  ) topics
  ...

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QUESTION

Improving Haskell performance for small GET requests

Asked 2021-May-02 at 00:04

In an effort to become better with Haskell, I'm rewriting a small CLI that I developed originally in Python. The CLI mostly makes GET requests to an API and allows for filtering/formatting the JSON result.

I'm finding my Haskell version to be a lot slower than my Python one.

To help narrow down the problem, I excluded all parts of my Haskell code except the fetching of data - essentially, it's this:

import           Data.Aeson
import qualified Data.ByteString.Char8 as BC
import           Data.List (intercalate)
import           Network.HTTP.Simple

...

-- For testing purposes
getUsers :: [Handle] -> IO ()
getUsers hs = do
    let handles = BC.pack $ intercalate ";" hs

    req <- parseRequest (baseUrl ++ "/user.info")
    let request = setRequestQueryString [("handles", Just handles)] $ req

    response <- httpJSON request

    let (usrs :: Maybe (MyApiResponseType [User])) = getResponseBody response
    print usrs

And I'm using the following dependencies:

dependencies:
  - base >= 4.7 && < 5
  - aeson
  - bytestring
  - http-conduit

To test this, I timed how long it takes for my Haskell program to retrieve data for a particular user (without any particular formatting). I compared it with my Python version (which formats the data), and Curl (which I piped into jq to format the data):

I ran each 5 times and took the average of the 3 middle values, excluding the highest and lowest times:

        Haskell   Python    Curl
real:   1017 ms   568 ms    214 ms
user:   1062 ms   367 ms    26 ms
sys:    210 ms    45 ms     10 ms

Ok, so the Haskell version is definitely slower. Next I tried profiling tools to narrow down the cause of the problem.

I profiled the code using an SCC annotation for the function above:

> stack build --profile
...
> stack exec --profile -- my-cli-exe +RTS -p -sstderr
...

     244,904,040 bytes allocated in the heap
      27,759,640 bytes copied during GC
       5,771,840 bytes maximum residency (6 sample(s))
         245,912 bytes maximum slop
              28 MiB total memory in use (0 MB lost due to fragmentation)

                                     Tot time (elapsed)  Avg pause  Max pause
  Gen  0       228 colls,   228 par    0.849s   0.212s     0.0009s    0.0185s
  Gen  1         6 colls,     5 par    0.090s   0.023s     0.0038s    0.0078s

  Parallel GC work balance: 30.54% (serial 0%, perfect 100%)

  TASKS: 21 (1 bound, 20 peak workers (20 total), using -N8)

  SPARKS: 0 (0 converted, 0 overflowed, 0 dud, 0 GC'd, 0 fizzled)

  INIT    time    0.004s  (  0.003s elapsed)
  MUT     time    0.881s  (  0.534s elapsed)
  GC      time    0.939s  (  0.235s elapsed)
  RP      time    0.000s  (  0.000s elapsed)
  PROF    time    0.000s  (  0.000s elapsed)
  EXIT    time    0.010s  (  0.001s elapsed)
  Total   time    1.833s  (  0.773s elapsed)

  Alloc rate    277,931,867 bytes per MUT second

  Productivity  48.1% of total user, 69.1% of total elapsed

Seems like a lot of time is being spent in garbage collection.

I looked at the generated .prof file, which gave this:

COST CENTRE                        MODULE                         SRC                                                  %time %alloc

>>=.\.ks'                          Data.ASN1.Get                  Data/ASN1/Get.hs:104:13-61                            10.2    9.8
fromBase64.decode4                 Data.Memory.Encoding.Base64    Data/Memory/Encoding/Base64.hs:(299,9)-(309,37)        9.0   12.3
>>=.\                              Data.ASN1.Parse                Data/ASN1/Parse.hs:(54,9)-(56,43)                      5.4    0.7
fromBase64.loop                    Data.Memory.Encoding.Base64    Data/Memory/Encoding/Base64.hs:(264,9)-(296,45)        4.2    7.4
>>=.\                              Data.ASN1.Get                  Data/ASN1/Get.hs:(104,9)-(105,38)                      4.2    3.5
decodeSignedObject.onContainer     Data.X509.Signed               Data/X509/Signed.hs:(167,9)-(171,30)                   3.6    2.9
runParseState.go                   Data.ASN1.BinaryEncoding.Parse Data/ASN1/BinaryEncoding/Parse.hs:(98,12)-(129,127)    3.0    3.2
getConstructedEndRepr.getEnd       Data.ASN1.Stream               Data/ASN1/Stream.hs:(37,11)-(41,82)                    3.0   12.7
getConstructedEnd                  Data.ASN1.Stream               Data/ASN1/Stream.hs:(23,1)-(28,93)                     3.0    7.8
readCertificates                   Data.X509.CertificateStore     Data/X509/CertificateStore.hs:(92,1)-(96,33)           3.0    2.2
fmap.\.ks'                         Data.ASN1.Get                  Data/ASN1/Get.hs:88:13-52                              1.8    2.2
decodeConstruction                 Data.ASN1.BinaryEncoding       Data/ASN1/BinaryEncoding.hs:(48,1)-(50,66)             1.8    0.0
fmap                               Data.ASN1.Parse                Data/ASN1/Parse.hs:41:5-57                             1.8    1.0
concat.loopCopy                    Data.ByteArray.Methods         Data/ByteArray/Methods.hs:(210,5)-(215,28)             1.2    0.4
fromBase64.rset                    Data.Memory.Encoding.Base64    Data/Memory/Encoding/Base64.hs:(312,9)-(314,53)        1.2    0.0
localTimeParseE.allDigits          Data.Hourglass.Format          Data/Hourglass/Format.hs:358:9-37                      1.2    0.3
getWord8                           Data.ASN1.Get                  Data/ASN1/Get.hs:(200,1)-(204,43)                      1.2    0.0
fmap.\                             Data.ASN1.Get                  Data/ASN1/Get.hs:(88,9)-(89,38)                        1.2    0.6
runParseState.runGetHeader.\       Data.ASN1.BinaryEncoding.Parse Data/ASN1/BinaryEncoding/Parse.hs:131:44-66            1.2    0.0
mplusEither                        Data.ASN1.BinaryEncoding.Parse Data/ASN1/BinaryEncoding/Parse.hs:(67,1)-(70,45)       1.2    4.9
getOID.groupOID                    Data.ASN1.Prim                 Data/ASN1/Prim.hs:299:9-92                             1.2    0.3
getConstructedEndRepr.getEnd.zs    Data.ASN1.Stream               Data/ASN1/Stream.hs:40:48-73                           1.2    0.0
getConstructedEndRepr.getEnd.(...) Data.ASN1.Stream               Data/ASN1/Stream.hs:40:48-73                           1.2    0.4
getConstructedEnd.(...)            Data.ASN1.Stream               Data/ASN1/Stream.hs:28:48-80                           1.2    0.3
decodeEventASN1Repr.loop           Data.ASN1.BinaryEncoding       Data/ASN1/BinaryEncoding.hs:(54,11)-(67,69)            1.2    2.5
put                                Data.ASN1.Parse                Data/ASN1/Parse.hs:(72,1)-(74,24)                      1.2    0.0
fromASN1                           Data.X509.ExtensionRaw         Data/X509/ExtensionRaw.hs:(55,5)-(61,71)               1.2    0.0
compare                            Data.X509.DistinguishedName    Data/X509/DistinguishedName.hs:31:23-25                1.2    0.0
putBinaryVersion                   Network.TLS.Packet             Network/TLS/Packet.hs:(109,1)-(110,41)                 1.2    0.0
parseLBS.onSuccess                 Data.ASN1.BinaryEncoding.Parse Data/ASN1/BinaryEncoding/Parse.hs:(147,11)-(149,64)    0.6    1.7
pemParseLBS                        Data.PEM.Parser                Data/PEM/Parser.hs:(92,1)-(97,41)                      0.6    1.0
runParseState.terminateAugment     Data.ASN1.BinaryEncoding.Parse Data/ASN1/BinaryEncoding/Parse.hs:(87,12)-(93,53)      0.0    1.7
parseOnePEM.getPemContent          Data.PEM.Parser                Data/PEM/Parser.hs:(56,9)-(64,93)                      0.0    1.8

This doesn't seem too bad, and when I scrolled down to functions I had defined and they didn't seem to be taking much time either.

This leads me to believe it's a memory leak problem(?), so I profiled the heap:

stack exec --profile -- my-cli-exe +RTS -h
hp2ps my-cli-exe.hp
open my-cli.exe.ps

heap

So it seems as though lots of space is being allocated on the heap, and then suddenly cleared.


The main issue is, I'm not sure where to go from here. My function is relatively small and is only getting a small JSON response of around 500 bytes. So where could the issue be coming from?

ANSWER

Answered 2021-May-02 at 00:04

It seemed odd that the performance of a common Haskell library was so slow for me, but somehow this approach solved my concerns:

I found that the performance of my executable was faster when I used stack install to copy the binaries:

stack install
my-cli-exe

instead of using build and run.

Here are the running times again for comparison:

        HS (stack install)  HS (stack run)   Python    Curl
real:   373 ms              1017 ms          568 ms    214 ms
user:   222 ms              1062 ms          367 ms    26 ms
sys:    141 ms              210 ms           45 ms     10 ms

Source https://stackoverflow.com/questions/67348097

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

Vulnerabilities

No vulnerabilities reported

Install Fragmentation

You can download it from GitHub.
You can use Fragmentation 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 Fragmentation 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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