discourse/spec/components/distributed_cache_spec.rb

require 'spec_helper'
require 'distributed_cache'

describe DistributedCache do

  let! :cache1 do
    DistributedCache.new("test")
  end

  let! :cache2 do
    DistributedCache.new("test")
  end

  def add_throw_away_cache
    c = DistributedCache.new("test")
    c["foofoo"] = "bar"
  end

  it 'correctly clears up caches' do
    start = DistributedCache.subscribers.length

    add_throw_away_cache
    GC.start
    cache1["foofoo"] = "bar1"
    wait_for do
      cache2["foofoo"] == "bar1"
    end

    DistributedCache.subscribers.length.should == start
  end

  it 'does not leak state across caches' do
    c2 = DistributedCache.new("test1")
    c3 = DistributedCache.new("test1")
    c2["hi"] = "hi"
    wait_for do
      c3["hi"] == "hi"
    end

    Thread.pass
    cache1["hi"].should == nil

  end

  it 'allows coerces symbol keys to strings' do
    cache1[:key] = "test"
    cache1["key"].should == "test"

    wait_for do
      cache2[:key] == "test"
    end
    cache2["key"].should == "test"
  end

  it 'sets other caches' do
    cache1["test"] = "world"
    wait_for do
      cache2["test"] == "world"
    end
  end

  it 'deletes from other caches' do
    cache1["foo"] = "bar"

    wait_for do
      cache2["foo"] == "bar"
    end

    cache1.delete("foo")
    cache1["foo"].should == nil

    wait_for do
      cache2["foo"] == nil
    end
  end

  it 'clears cache on request' do
    cache1["foo"] = "bar"

    wait_for do
      cache2["foo"] == "bar"
    end

    cache1.clear
    cache1["foo"].should == nil
    wait_for do
      cache2["boom"] == nil
    end
  end

end