memory_test.go

// Copyright 2020-2021 Dolthub, Inc.
//
// 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 sql

import (
	"testing"

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

func TestManager(t *testing.T) {
	require := require.New(t)
	m := NewMemoryManager(nil)

	kv, dispose := m.NewLRUCache(5)
	_, ok := kv.(*lruCache)
	require.True(ok)
	require.Len(m.caches, 1)
	dispose()
	require.Len(m.caches, 0)

	kv, dispose = m.NewHistoryCache()
	_, ok = kv.(*historyCache)
	require.True(ok)
	require.Len(m.caches, 1)
	dispose()
	require.Len(m.caches, 0)

	rc, dispose := m.NewRowsCache()
	_, ok = rc.(*rowsCache)
	require.True(ok)
	require.Len(m.caches, 1)
	dispose()
	require.Len(m.caches, 0)

	m.addCache(disposableCache{})
	f := new(freeableCache)
	m.addCache(f)
	m.Free()
	require.True(f.freed)
}

type disposableCache struct{}

func (d disposableCache) Dispose() {}

type freeableCache struct {
	disposableCache
	freed bool
}

func (f *freeableCache) Free() { f.freed = true }

func TestHasAvailable(t *testing.T) {
	require.True(t, HasAvailableMemory(fixedReporter(2, 5)))
	require.False(t, HasAvailableMemory(fixedReporter(6, 5)))
}

type mockReporter struct {
	f   func() uint64
	max uint64
}

func (m mockReporter) UsedMemory() uint64 { return m.f() }
func (m mockReporter) MaxMemory() uint64  { return m.max }

func fixedReporter(v, max uint64) mockReporter {
	return mockReporter{func() uint64 {
		return v
	}, max}
}

type mockMemory struct {
	f func()
}

func (m mockMemory) Free() {
	if m.f != nil {
		m.f()
	}
}