webserver - hunchentoot session- v. thread-localized values (ccl) -


i'm using hunchentoot session values make server code re-entrant. problem session values are, definition, retained during session, i.e., 1 call same browser next, whereas looking amount thread-specific re-entrancy, values disappear between calls -- want treat each click separate "from scratch" event, if same session . easy enough have driver either set nil, or delete session values, i'm wondering if there's "correct" way this? don't see thread-based analog hunchentoot:session-value in documentation.

thanks in advance guidance can offer.

if want value "thread specific" , @ same time "from scratch" on every request, requires every request must dispatched in brand new thread. not case according hunchentoot documentation, says 2 models supported: single-threaded taskmaster , thread-per-connection taskmaster.

if configuration multi-threaded, thread-specific variable bound in request-handling can therefore expected per-connection. in single-threaded hunchentoot setup, global, tied request servicing thread.

a thread-based analog hunchentoot:session-value doesn't exist because introduce behaviors web app surprisingly change if threading model reconfigured, or if request pattern browser changes. browser can make multiple requests using same connection, or close connection between requests.

to extend request objects custom per-request, into, perhaps, subclassing acceptor (how described in docs). custom acceptor have custom method of process-connection generic function create extended/subclasses request objects carrying stuff wanted put request.

another way have global weak hash binds request objects keys additional information.


Comments

Post a Comment

Popular posts from this blog

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m...
Read more

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

sql server - Why does Linq-to-SQL add unnecessary COUNT()? -

here tables: create table customer ( cid int primary key, name varchar(32) ) create table ord ( oid int primary key, cid int foreign key references customer, address varchar(20) ) here's linq-to-sql statement: var aaa = c in db.customer select new { c, o = c.ord.tolist() }; and here's inexplicable query generated linq-to-sql: select [t0].[cid] [cid], [t0].[name] [name], [t1].[oid] [oid], [t1].[cid] [cid2], [t1].[address] [address], (select count(*) [dbo].[ord] [t2] [t2].[cid] = [t0].[cid]) [value] [dbo].[customer] [t0] left outer join [dbo].[ord] [t1] on [t1].[cid] = [t0].[cid] order [t0].[cid], [t1].[oid] i want understand how rid of count(*) part. it's entirely uncalled for! linq needs count(*) in order determine number of entries returned o = c.ord.tolist() .
Read more