multiple-instances | 易学教程

Many instances of a class

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I am trying to write a life simulation in python with a variety of animals. It is impossible to name each instance of the classes I am going to use because I have no way of knowing how many there will be. So, my question: How can I automatically give a name to an object? I was thinking of creating a "Herd" class which could be all the animals of that type alive at the same time... Grumbel Hm, well you normally just stuff all those instances in a list and then iterate over that list if you want to do something with them. If you want to automatically keep track of each instance created you can

Detecting if another instance of the application is already running

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问题 My application needs to behave slightly differently when it loads if there is already an instance running. I understand how to use a mutex to prevent additional instances loading, but that doesn't quite solve my problem. For example: Instance 1 loads, gets the mutex. Instance 2 loads, can't get the mutex, knows there's another instance. So far, so good. Instance 1 closes, releases the mutex. Instance 3 loads, gets the mutex, doesn't know that Instance 2 is still running. Any ideas? Thankfully

Logging multiple instance application best practice?

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问题 I finally tried log4net for my WPF desktop application. I'm struggling with the fact that RollingFileAppender has no built in support for multiple instance application. I don't like an idea of restricting the application to single instance just to make logger happy. Single intstance tricks are all ugly hacks. Using process ID in the filename of the log file is also not good enough. This has potential of eating up unlimited space, since RollingFileAppender is useless in this situation. One

heroku multiple dyno socket.io

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I am developing a node.js application with Socket.io and deploying same on Heroku Dyno. Socket.io is using RedisStore with its PUB/SUB. Socket.io client works perfectly fine with one dyno in heroku. But when I increase the number of dyno to more than one (say two), socket io client request does not work. Please let me know if any specific configuration on client side is needed while setting up heroku for multiple web dyno having socket.io support. Sorry, but heroku doesn't support sticky session and it's not supported by Socket.io Sticky load balancing If you plan to distribute the load of

Android: two instances of Text-to-Speech work very slowly

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I need to implement feature in my Andorind app which allows to play two different synthesized languages in current Acitivity - for instance having two buttons Say English and Say French I've tried to do it in two following ways but both of them works ineffectively because there is long delay before sound plays: first approach: create single instance of TTS and change language by setLocale method depending on what language has to be played. Unfortunately switching between languages by setLocale is time consuming which has impact on reaction after button is clicked second approach: create two

COM+ object activation in a different partition

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I had created a COM+ domain partition then mapped it to a Windows 2008 server machine and imported a COM+ application into it. I tried using the following C# code to activate an object from that specific partition on the server remotely: //partition guid Guid guidMyPartition = new Guid("41E90F3E-56C1-4633-81C3-6E8BAC8BDD70"); //parition moniker string uri= "partition:{" + guidMyPartition + "}/new:MyObject"; Type t = Type.GetTypeFromProgID("MyObject", "MyServer"); MyObject obj = (MyObject)Activator.GetObject(t, uri); But I get this exception: Cannot create channel sink to connect to URL

SQL Server: Select from two tables and insert into one

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I have a stored procedure with two table variables (@temp and @temp2). How can I select the values from both temp tables (Both table variables contain one row) and insert them all in one table ? I tried the following but this didn't work and I got the error that the number of SELECT and INSERT statements does not match. DECLARE @temp AS TABLE ( colA datetime, colB nvarchar(1000), colC varchar(50) ) DECLARE @temp2 AS TABLE ( colD int ) ... INSERT INTO MyTable ( col1, col2, col3, col4 ) SELECT colD FROM @temp2, colA FROM @temp, colB FROM @temp, colC FROM @temp Many thanks for any help with this,

Node+Passport.js + Sessions + multiple servers

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Passport is great. I now discovered that I have some problem with how it handles sessions. I must be using it wrong. All works well for me with login + sessions + user data I store in my database. However I find that when I move to production environment (cloud on EC2 with multiple servers), I lose the login session each time. This is now clear to me - probably happens since the session is unique to each server. So my question is - how do I get around this.. I guess I will need to store my own cookie on the user's browser? Does this mean that I cannot use express.session at all? Thanks, Ilan

How to use multiple target on body with Bootstrap ScrollSpy

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I want to use Bootstrap ScrollSpy with multiple nav, my main nav and a vertical subnav. I tried multiple thing like : <body data-spy="scroll" data-target="#main-nav #subnav"> <body data-spy="scroll" data-target="#main-nav, #subnav"> $('body').scrollspy({target: "#main-nav"}); $('body').scrollspy({target: "#subnav"}); $('body').scrollspy({target: "#main-nav"}, {target: "#subnav"}); Putting wrapper div: <body data-spy="scroll" data-target="#main-nav"><div data-spy="scroll" data-target="#subnav"> but nothing worked fine... How can I acheive this? Thank you! Ok, I found a way to acheive what I

Detecting if another instance of the application is already running

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My application needs to behave slightly differently when it loads if there is already an instance running. I understand how to use a mutex to prevent additional instances loading, but that doesn't quite solve my problem. For example: Instance 1 loads, gets the mutex. Instance 2 loads, can't get the mutex, knows there's another instance. So far, so good. Instance 1 closes, releases the mutex. Instance 3 loads, gets the mutex, doesn't know that Instance 2 is still running. Any ideas? Thankfully it doesn't need to deal with multiple user accounts or anything like that. (C#, desktop application)