public void SinglePage(int pageSize)
{
var fsManager = new FileSystemPageManager(pageSize);
var manager = new CachingPageManager(fsManager, 100, 100);
using (var storage = new Storage(manager))
{
storage.CreateNew(StoragePath);
// append a page
IPage page = manager.CreatePage();
// fill and update it
var r = new Random();
r.NextBytes(page.Content);
manager.UpdatePage(page);
// fetch updated content
IPage fetchedPage = manager.FetchPage(page.Index);
Assert.IsTrue(AreEqualByteArrays(page.Content, fetchedPage.Content));
// remove it
manager.RemovePage(page.Index);
// try to fetch removed page
Assert.Throws <PageMapException>(() => manager.FetchPage(page.Index));
// resurrect and check content
page = manager.CreatePage();
Assert.IsTrue(AreEqualByteArrays(new byte[manager.PageSize], page.Content));
}
}
public void MultiPage(int pageSize)
{
var fsManager = new FileSystemPageManager(pageSize);
var manager = new CachingPageManager(fsManager, 500, 100);
using (var storage = new Storage(manager))
{
storage.CreateNew(StoragePath);
var r = new Random();
// fill storage with random data
int pageCount = 1000;
var pages = new IPage[pageCount];
for (int i = 0; i < pageCount; i++)
{
pages[i] = manager.CreatePage();
r.NextBytes(pages[i].Content);
manager.UpdatePage(pages[i]);
}
// fetch and compare pages
CheckStoragePages(pages, manager);
// generate a random indexes
int k = 0;
var indexesToDelete = new long[pageCount / 2];
while (k < pageCount / 2)
{
int index = r.Next(pageCount);
if (!indexesToDelete.Contains(index))
{
indexesToDelete[k] = index;
k++;
}
}
// remove pages with these indexes
foreach (long i in indexesToDelete)
{
manager.RemovePage(i);
}
// replace deleted pages with new ones
for (int i = 0; i < pageCount; i++)
{
if (indexesToDelete.Contains(pages[i].Index))
{
pages[i] = manager.CreatePage();
r.NextBytes(pages[i].Content);
manager.UpdatePage(pages[i]);
}
}
// fetch and compare pages
CheckStoragePages(pages, manager);
}
}
public void RandomAccess(int pageSize)
{
var fsManager = new FileSystemPageManager(pageSize);
var manager = new CachingPageManager(fsManager, 1000, 500);
var pages = new List <IPage>();
using (var storage = new Storage(manager))
{
storage.CreateNew(StoragePath);
var r = new Random();
// fill storage with random data
int pageCount = 1000;
for (int i = 0; i < pageCount; i++)
{
pages.Add(manager.CreatePage());
r.NextBytes(pages[i].Content);
manager.UpdatePage(pages[i]);
}
int operationCount = 10000;
for (int k = 0; k < operationCount; k++)
{
int op = r.Next(4);
switch (op)
{
case 0: // update
int index = r.Next(pages.Count - 1);
r.NextBytes(pages[index].Content);
manager.UpdatePage(pages[index]);
break;
case 1: // add
IPage page = manager.CreatePage();
r.NextBytes(page.Content);
manager.UpdatePage(page);
pages.Add(page);
break;
case 2: // remove
index = r.Next(pages.Count - 1);
manager.RemovePage(pages[index].Index);
pages.RemoveAt(index);
break;
case 3: // fetch
index = r.Next(pages.Count - 1);
manager.FetchPage(pages[index].Index);
break;
}
}
}
var m = new FileSystemPageManager(pageSize);
using (var storage = new Storage(m))
{
storage.OpenExisting(StoragePath);
// fetch and compare pages by filesystem manager
CheckStoragePages(pages, m);
}
}
