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// Copyright 2011, 2012, 2013 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package utils_test
import (
"fmt"
"time"
"github.com/juju/testing"
jc "github.com/juju/testing/checkers"
gc "gopkg.in/check.v1"
"github.com/juju/utils"
)
const longWait = 10 * time.Second
type limiterSuite struct {
testing.IsolationSuite
}
var _ = gc.Suite(&limiterSuite{})
func (*limiterSuite) TestAcquireUntilFull(c *gc.C) {
l := utils.NewLimiter(2)
c.Check(l.Acquire(), jc.IsTrue)
c.Check(l.Acquire(), jc.IsTrue)
c.Check(l.Acquire(), jc.IsFalse)
}
func (*limiterSuite) TestBadRelease(c *gc.C) {
l := utils.NewLimiter(2)
c.Check(l.Release(), gc.ErrorMatches, "Release without an associated Acquire")
}
func (*limiterSuite) TestAcquireAndRelease(c *gc.C) {
l := utils.NewLimiter(2)
c.Check(l.Acquire(), jc.IsTrue)
c.Check(l.Acquire(), jc.IsTrue)
c.Check(l.Acquire(), jc.IsFalse)
c.Check(l.Release(), gc.IsNil)
c.Check(l.Acquire(), jc.IsTrue)
c.Check(l.Release(), gc.IsNil)
c.Check(l.Release(), gc.IsNil)
c.Check(l.Release(), gc.ErrorMatches, "Release without an associated Acquire")
}
func (*limiterSuite) TestAcquireWaitBlocksUntilRelease(c *gc.C) {
l := utils.NewLimiter(2)
calls := make([]string, 0, 10)
start := make(chan bool, 0)
waiting := make(chan bool, 0)
done := make(chan bool, 0)
go func() {
<-start
calls = append(calls, fmt.Sprintf("%v", l.Acquire()))
calls = append(calls, fmt.Sprintf("%v", l.Acquire()))
calls = append(calls, fmt.Sprintf("%v", l.Acquire()))
waiting <- true
l.AcquireWait()
calls = append(calls, "waited")
calls = append(calls, fmt.Sprintf("%v", l.Acquire()))
done <- true
}()
// Start the routine, and wait for it to get to the first checkpoint
start <- true
select {
case <-waiting:
case <-time.After(longWait):
c.Fatalf("timed out waiting for 'waiting' to trigger")
}
c.Check(l.Acquire(), jc.IsFalse)
l.Release()
select {
case <-done:
case <-time.After(longWait):
c.Fatalf("timed out waiting for 'done' to trigger")
}
c.Check(calls, gc.DeepEquals, []string{"true", "true", "false", "waited", "false"})
}
func (*limiterSuite) TestAcquirePauses(c *gc.C) {
clk := testing.NewClock(time.Now())
l := utils.NewLimiterWithPause(2, 10*time.Millisecond, 20*time.Millisecond, clk)
acquired := make(chan bool, 1)
start := make(chan bool, 0)
go func() {
<-start
defer l.Release()
acquired <- l.Acquire()
}()
start <- true
// Minimum pause time not exceeded, acquire should not happen.
clk.Advance(9 * time.Millisecond)
select {
case <-acquired:
c.Fail()
case <-time.After(50 * time.Millisecond):
}
clk.Advance(11 * time.Millisecond)
select {
case <-acquired:
case <-time.After(50 * time.Millisecond):
c.Fatal("acquire failed")
}
}
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