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require 'spec_helper'
if RUBY_PLATFORM == "java"
require 'java'
java_import 'java.lang.System'
end
describe Roo::Helpers::WeakInstanceCache do
let(:klass) do
Class.new do
include Roo::Helpers::WeakInstanceCache
def memoized_data
instance_cache(:@memoized_data) do
"Some Costly Operation #{rand(1000)}" * 1_000
end
end
end
end
subject do
klass.new
end
it 'should be lazy' do
expect(subject.instance_variables).to_not include(:@memoized_data)
data = subject.memoized_data
expect(subject.instance_variables).to include(:@memoized_data)
end
it 'should be memoized' do
data = subject.memoized_data
expect(subject.memoized_data).to equal(data)
end
it 'should recalculate after GC' do
expect(subject.instance_variables).to_not include(:@memoized_data)
GC.disable
subject.memoized_data && nil
expect(subject.instance_variables).to include(:@memoized_data)
force_gc
expect(subject.instance_variables).to_not include(:@memoized_data)
GC.disable
subject.memoized_data && nil
expect(subject.instance_variables).to include(:@memoized_data)
end
it 'must remove instance variable' do
expect(subject.instance_variables).to_not include(:@memoized_data)
GC.disable
subject.memoized_data && nil
expect(subject.instance_variables).to include(:@memoized_data)
force_gc
expect(subject.instance_variables).to_not include(:@memoized_data)
end
context '#inspect must not raise' do
it 'before calculation' do
expect{subject.inspect}.to_not raise_error
end
it 'after calculation' do
GC.disable
subject.memoized_data && nil
expect{subject.inspect}.to_not raise_error
expect(subject.inspect).to include("Some Costly Operation")
force_gc
end
it 'after GC' do
subject.memoized_data && nil
force_gc
expect(subject.instance_variables).to_not include(:@memoized_data)
expect{subject.inspect}.to_not raise_error
expect(subject.inspect).to_not include("Some Costly Operation")
end
end
if RUBY_PLATFORM == "java"
def force_gc
System.gc
sleep(0.1)
end
else
def force_gc
GC.start(full_mark: true, immediate_sweep: true)
sleep(0.1)
GC.start(full_mark: true, immediate_sweep: true)
end
end
end
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