private static void Generate(string tempFile, SerializationEngine serializer, List<TestClass> list,
Action<Action<int>> loop)
{
using (var stream = new FileStream(tempFile, FileMode.Create, FileAccess.ReadWrite, FileShare.None))
{
var data = new StreamAccessor(stream);
var lFile = new LowLevelAppendOnlyFile(data);
var file = new GenericAppendOnlyFile<TestClass>(lFile, serializer);
// append COUNT records
ShowTime("append", () => loop(i => file.Append(list[i])));
// read all the records
ShowTime("read all", () => { var records = file.ReadFrom(0).ToList(); });
// read all the records, one at a time
ShowTime("read all, one at a time", () => loop(i => file.Read(i)));
}
// close and reopen the file (rebuilds the index)
ShowTime("rebuild index", () =>
{
using (var stream = new FileStream(tempFile, FileMode.Open, FileAccess.ReadWrite, FileShare.None))
{
var data = new StreamAccessor(stream);
var lFile = new LowLevelAppendOnlyFile(data);
}
});
}
private static void Main(string[] args)
{
var serializer = new ProtoBufSerializationEngine();
var list = new List<TestClass>();
for (var i = 0; i < COUNT; i++)
{
var c = new TestClass {Name = GenerateRandomString(20), Address = GenerateRandomString(40)};
list.Add(c);
}
var tempFile = Path.GetTempFileName();
Console.WriteLine("Using {0} - sequentially writing and reading {1} records", tempFile, COUNT);
Generate(tempFile, serializer, list, SeqForLoop);
// verify the data
using (var stream = new FileStream(tempFile, FileMode.Open, FileAccess.ReadWrite, FileShare.None))
{
var data = new StreamAccessor(stream);
var lFile = new LowLevelAppendOnlyFile(data);
var file = new GenericAppendOnlyFile<TestClass>(lFile, serializer);
var records = file.ReadFrom(0).ToList();
// verify that the index is built correctly
for (var i = 0; i < COUNT; i++)
{
var r = records[i];
Debug.Assert(r.Name == list[i].Name);
Debug.Assert(r.Address == list[i].Address);
}
}
// multi-threaded test
tempFile = Path.GetTempFileName();
Console.WriteLine("Using {0} - multi-threaded writing and reading {1} records", tempFile, COUNT);
Generate(tempFile, serializer, list, ParForLoop);
}
public void GenericAppendOnlyFileSmokeTest()
{
var stream = new MemoryStream();
var data = new StreamAccessor(stream);
var file = new LowLevelAppendOnlyFile(data);
var serializer = new ProtoBufSerializationEngine();
var sut = new GenericAppendOnlyFile<TestClass>(file, serializer);
sut.Append(new TestClass {Name = "Marcel", Address = "Kennesaw, GA"});
sut.Append(new TestClass {Name = "Gigi Meseriasu", Address = "Washington, DC"});
var r1 = sut.Read(0);
Assert.AreEqual("Marcel", r1.Name);
Assert.AreEqual("Kennesaw, GA", r1.Address);
var rs = sut.ReadFrom(0).ToList();
var r2 = rs[1];
Assert.AreEqual("Gigi Meseriasu", r2.Name);
Assert.AreEqual("Washington, DC", r2.Address);
Assert.AreEqual(2, sut.Index.Length);
Assert.AreEqual(0, sut.Index[0]);
}