ctrie_test.go

/*
Copyright 2015 Workiva

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package matchbox

import (
	"strconv"
	"sync"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
)

func TestSnapshot(t *testing.T) {
	assert := assert.New(t)
	ctrie := newCtrie(NewAMQPConfig())
	sub := subscriber("abc")
	for i := 0; i < 100; i++ {
		ctrie.Insert(strconv.Itoa(i), sub)
	}
	for i := 0; i < 100; i++ {
		assert.Equal([]Subscriber{sub}, ctrie.Lookup(strconv.Itoa(i)))
	}
	assert.Equal([]Subscriber{}, ctrie.Lookup("blah"))

	snapshot := ctrie.Snapshot()
	for i := 0; i < 100; i++ {
		assert.Equal([]Subscriber{sub}, snapshot.Lookup(strconv.Itoa(i)))
	}
	assert.Equal([]Subscriber{}, snapshot.Lookup("blah"))

	// Ensure modifying snapshot doesn't affect original.
	snapshot.Remove("0", sub)
	assert.Equal([]Subscriber{}, snapshot.Lookup("0"))
	assert.Equal([]Subscriber{sub}, ctrie.Lookup("0"))

	// Ensure modifying original doesn't affect snapshot.
	ctrie.Insert("foo", sub)
	assert.Equal([]Subscriber{sub}, ctrie.Lookup("foo"))
	assert.Equal([]Subscriber{}, snapshot.Lookup("foo"))

	// Ensure snapshots-of-snapshots work as expected.
	snapshot2 := snapshot.Snapshot()
	for i := 1; i < 100; i++ {
		assert.Equal([]Subscriber{sub}, snapshot2.Lookup(strconv.Itoa(i)))
	}
	snapshot2.Insert("0", sub)
	assert.Equal([]Subscriber{sub}, snapshot2.Lookup("0"))
	assert.Equal([]Subscriber{}, snapshot.Lookup("0"))

	// Ensure read-only snapshots panic on write.
	snapshot = ctrie.ReadOnlySnapshot()
	defer func() {
		assert.NotNil(recover())
	}()
	snapshot.Remove("0", sub)

	assert.Equal(snapshot, snapshot.ReadOnlySnapshot())
}

func TestConcurrency(t *testing.T) {
	assert := assert.New(t)
	ctrie := newCtrie(NewAMQPConfig())
	var wg sync.WaitGroup
	wg.Add(2)

	go func() {
		for i := 0; i < 1000; i++ {
			ctrie.Insert(strconv.Itoa(i), subscriber(i))
		}
		wg.Done()
	}()

	go func() {
		for i := 0; i < 1000; i++ {
			val := ctrie.Lookup(strconv.Itoa(i))
			if len(val) > 0 {
				assert.Equal(subscriber(i), val[0])
			}
		}
		wg.Done()
	}()

	for i := 0; i < 1000; i++ {
		time.Sleep(5)
		ctrie.Remove(strconv.Itoa(i), subscriber(i))
	}

	wg.Wait()
}