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How to run for x seconds in a http handler


How to run for x seconds in a http handler

By : Dennis Zheng
Date : November 21 2020, 07:01 PM
this one helps. Cancellations and timeouts are often done with a context.Context.
While this simple example could be done with a channel alone, using the context here makes it more flexible, and can take into account the client disconnecting as well.
code :
func benchmarkHandler(w http.ResponseWriter, r *http.Request) {
    ctx, cancel := context.WithTimeout(r.Context(), 30*time.Second)
    defer cancel()

    counter := InsertRecords(ctx)

    w.WriteHeader(200)
    io.WriteString(w, fmt.Sprintf("counter is %d", counter))
}

func InsertRecords(ctx context.Context) int {
    counter := 0
    done := ctx.Done()
    for {
        select {
        case <-done:
            return counter
        default:
        }

        // db code goes here
        counter++
    }
    return counter
}
func InsertRecords(ctx context.Context) int {
    counter := int64(0)
    done := ctx.Done()

    go func() {
        for {
            select {
            case <-done:
                return
            default:
            }

            // db code goes here
            atomic.AddInt64(&counter, 1)
        }
    }()

    <-done
    return int(atomic.LoadInt64(&counter))
}


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Handler to add HTTP headers to HTTP request not invoked when using Axis Client API

Handler to add HTTP headers to HTTP request not invoked when using Axis Client API


By : user2369746
Date : March 29 2020, 07:55 AM
it should still fix some issue Okie. This should do the trick :
1 - Create a wsdd file (say /tmp/test.wsdd) containing this :
code :
<deployment xmlns="http://xml.apache.org/axis/wsdd/" xmlns:java="http://xml.apache.org/axis/wsdd/providers/java">
 <handler name="test" type="java:axistest.TestHandler" />
 <transport name="http" pivot="java:org.apache.axis.transport.http.HTTPSender">
   <requestFlow>
    <handler type="test"/>
   </requestFlow>
 </transport>
</deployment>
java org.apache.axis.utils.Admin client /tmp/test.wsdd
package axistest;

import javax.xml.namespace.QName;
import javax.xml.soap.MimeHeaders;
import org.apache.axis.AxisFault;
import org.apache.axis.MessageContext;
import org.apache.axis.handlers.BasicHandler;

public class TestHandler1 extends BasicHandler {

@Override
public void init() {
    System.out.println("init called");
    super.init();
    System.out.println("init called");
}

@Override
public void cleanup() {
    super.cleanup();
    System.out.println("cleanup called");
}

@Override
public void invoke(MessageContext mc) throws AxisFault {
    System.out.println("invoke called");
    System.out.println("=----------------------------------=");
    MimeHeaders mimeHeaders = mc.getMessage().getMimeHeaders();
    mimeHeaders.addHeader("X-Test", "Hello");
    System.out.println("Headers : \n " + mimeHeaders);
}

public QName[] getHeaders() {
    System.out.println("getHeaders");
    return new QName[1];
}

}
- Unable to find required classes (javax.activation.DataHandler and javax.mail.internet.MimeMultipart). Attachment support is disabled.
init called
init called
invoke called
=----------------------------------=
Headers : 
 org.apache.axis.message.MimeHeaders@761eec35
.
.
.
How to call static file handler from HTTP handler in IIS7 and ASP.NET 4.0?

How to call static file handler from HTTP handler in IIS7 and ASP.NET 4.0?


By : user2658830
Date : March 29 2020, 07:55 AM
wish helps you It should be pretty easy to replicate StaticFileHandler
Download Reflector Open System.Web Search for StaticFileHandler Open method ProcessRequestInternal() Open method SendFile()
code :
context.Response.TransmitFile(physicalPath, offset, length);
Performance difference between Synchronous HTTP Handler and Asynchronous HTTP Handler

Performance difference between Synchronous HTTP Handler and Asynchronous HTTP Handler


By : user3430790
Date : March 29 2020, 07:55 AM
I wish this help you ASP.NET uses the thread pool to process incoming HTTP requests.
When an IHttpHandler is called, a thread pool thread is used to run that request and the same thread is used to process the entire request. If that request calls out to a database or another web service or anything else that can take time, the thread pool thread waits. This means thread pool threads spend time waiting on things when they could be used to process other requests.
communicating between http handler and websocket handler in Cowboy

communicating between http handler and websocket handler in Cowboy


By : user2955065
Date : November 22 2020, 10:33 AM
Does that help A websocket handler in cowboy is a long lived request process to which you can send websocket or erlang messages.
In your case, there are 2 types of processes:
code :
websocket_init(_, Req, _Opts) ->
  ...
  % l is for local process registration
  % echo is the name of the event you register the process to
  gproc_ps:subscribe(l, echo),
  ...

websocket_info({gproc_ps_event, echo, Echo}, Req, State) ->
  % sending the Echo to the client
  {reply, {text, Echo}, Req, State};
echo(<<"GET">>, Echo, Req) ->
    % sending the echo message to the websockets handlers
    gproc_ps:publish(l, echo, Echo),
    cowboy_req:reply(200, [
        {<<"content-type">>, <<"text/plain; charset=utf-8">>}
    ], Echo, Req);
Asp.net custom http handler before another ashx http handler

Asp.net custom http handler before another ashx http handler


By : 疯狂乱抓
Date : March 29 2020, 07:55 AM
may help you . Handlers in ASP.NET are endpoints, so there can be only one per request. You can t really do something and then pass it along. If you want your handler to run instead of the regular page handler then first remove the default ASPX handler and then add yours. See MSDN for the config file schema.
If you want to just run something before a handler and possible affect which handler runs, you need to implement an IHttpModule
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