Rails：是否可以在线程中初始化一些东西？

发布于 2024-10-24 23:48:15 字数 482 浏览 1 评论 0原文

在我的初始化程序之一中，我需要从 Redis 实例中获取一些哈希值。然而，由于哈希的数量和连接的弱点，加载可能需要相当长的时间。由于它位于初始化程序中，因此在加载所有哈希值之前应用程序不可用。

因此，我想我可以在线程中执行初始化，以便应用程序可以启动，然后哈希值将按时加载，因为它们对应用程序来说不是必需的。

我尝试过这样的事情：

REDIS = Redis.new(:host => uri.host, :port => uri.port, :password => uri.password)
STORE = {}
Thread.abort_on_exception = true
Thread.new do
  REDIS.keys.each do |key|
    STORE[key] = REDIS[key]
  end
end

但它不起作用，并且没有错误消息:(

有什么想法吗

？

原文

In one of the my initializer I need to fetch some hashes from a redis instance.
However due to the number of hashs and the connection weaknesses the loading can take quite a moment.
Since it's in the initializer, the application is not available until the hashes have all been loaded.

Therefore I was thinking I could perform the initialization in a thread so the application can start and then the hashes would get loaded on their on time as they are not essential to the application.

I have tried something like this:

REDIS = Redis.new(:host => uri.host, :port => uri.port, :password => uri.password)
STORE = {}
Thread.abort_on_exception = true
Thread.new do
  REDIS.keys.each do |key|
    STORE[key] = REDIS[key]
  end
end

But it does not work and there are no error messages :(

Any ideas?

Alex

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夜巴黎 2024-10-31 23:48:15

请您再解释一下好吗？

这里的目标是什么？您正在对哈希值的内容做什么？
你运行什么堆栈？

我尝试对本地计算机（OS X 10.6.7）上运行的 Rails 3.0.5/WEBrick 进行简单测试：

puts "I am in the main thread."
Thread.abort_on_exception = true
Thread.new do
  for i in 1..5
    puts "I am in a thread."
    sleep 2
  end
end
Thread.new do
  for i in 1..5
    puts "I am in another thread."
    sleep 1
  end
end

它按照我预期的方式工作：

ultramarine:ThreadTest jdc$ rails s
=> Booting WEBrick
=> Rails 3.0.5 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
I am in the main thread.
I am in a thread.
I am in another thread.
[2011-03-23 18:30:28] INFO  WEBrick 1.3.1
[2011-03-23 18:30:28] INFO  ruby 1.9.2 (2010-12-25) [x86_64-darwin10.5.0]
[2011-03-23 18:30:28] INFO  WEBrick::HTTPServer#start: pid=5802 port=3000
I am in another thread.
I am in a thread.
I am in another thread.
I am in another thread.
I am in a thread.
I am in another thread.
I am in a thread.
I am in a thread.

Will you please explain a bit more?

What is the goal here? What are you doing with the contents of the hashes?
What stack are you running?

I tried a simple test against Rails 3.0.5/WEBrick running on my local machine (OS X 10.6.7):

puts "I am in the main thread."
Thread.abort_on_exception = true
Thread.new do
  for i in 1..5
    puts "I am in a thread."
    sleep 2
  end
end
Thread.new do
  for i in 1..5
    puts "I am in another thread."
    sleep 1
  end
end

And it worked the way I expected:

ultramarine:ThreadTest jdc$ rails s
=> Booting WEBrick
=> Rails 3.0.5 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
I am in the main thread.
I am in a thread.
I am in another thread.
[2011-03-23 18:30:28] INFO  WEBrick 1.3.1
[2011-03-23 18:30:28] INFO  ruby 1.9.2 (2010-12-25) [x86_64-darwin10.5.0]
[2011-03-23 18:30:28] INFO  WEBrick::HTTPServer#start: pid=5802 port=3000
I am in another thread.
I am in a thread.
I am in another thread.
I am in another thread.
I am in a thread.
I am in another thread.
I am in a thread.
I am in a thread.

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