public void ReadMessages(long from, long till, int maxCount, Action <MessageWithId> action)
{
Require.ZeroOrGreater("from", from);
Require.ZeroOrGreater("maxOffset", till);
Require.Positive("maxCount", maxCount);
var count = 0;
using (var prs = new PageReadStream(Messages, from, till, _buffer))
{
using (var bin = new BinaryReader(prs))
{
while (prs.Position < prs.Length)
{
var message = StorageFormat.Read(bin);
action(message);
count += 1;
if (count >= maxCount)
{
break;
}
}
}
}
}
public MessageResult ReadMessages(long from, long till, int maxCount)
{
Require.ZeroOrGreater("from", from);
Require.ZeroOrGreater("maxOffset", till);
Require.Positive("maxCount", maxCount);
var list = new List <MessageWithId>(maxCount);
var position = from;
using (var prs = new PageReadStream(Messages, from, till, _buffer)) {
using (var bin = new BinaryReader(prs)) {
while (prs.Position < prs.Length)
{
var message = StorageFormat.Read(bin);
list.Add(message);
position = prs.Position;
if (list.Count >= maxCount)
{
break;
}
}
}
}
return(new MessageResult(list, position));
}
void RunSubscription(
Subscription sub,
long position,
CancellationToken ct,
int bufferSize,
int cacheSize
)
{
sub.DebugStartPosition = position;
var buffer = new byte[bufferSize];
// forever try
while (!ct.IsCancellationRequested)
{
try {
// read current max length
var length = Position.Read();
sub.DebugKnownMaxOffset = length;
using (var prs = new PageReadStream(Messages, position, length, buffer)) {
using (var bin = new BinaryReader(prs)) {
while (prs.Position < prs.Length)
{
var message = StorageFormat.Read(bin);
sub.Buffer.Enqueue(message);
sub.DebugEnqueuedOffset = prs.Position;
position = prs.Position;
while (sub.Buffer.Count >= cacheSize)
{
ct.WaitHandle.WaitOne(500);
}
}
}
}
// wait till we get chance to advance
while (Position.Read() == position)
{
if (ct.WaitHandle.WaitOne(1000))
{
return;
}
}
}
catch (ForbiddenException) {
throw;
}
catch (Exception ex) {
Debug.Print("Exception {0}", ex);
ct.WaitHandle.WaitOne(1000 * 5);
}
}
}
public MessageResult ReadMessages(long from, long till, int maxCount) {
Require.ZeroOrGreater("from", from);
Require.ZeroOrGreater("maxOffset", till);
Require.Positive("maxCount", maxCount);
var list = new List<MessageWithId>(maxCount);
var position = from;
using (var prs = new PageReadStream(_messages, from, till, _buffer)) {
using (var bin = new BinaryReader(prs)) {
while (prs.Position < prs.Length) {
var message = StorageFormat.Read(bin);
list.Add(message);
position = prs.Position;
if (list.Count >= maxCount) {
break;
}
}
}
}
return new MessageResult(list, position);
}
void RunSubscription(
Subscription sub,
long position,
CancellationToken ct,
int bufferSize,
int cacheSize
) {
sub.DebugStartPosition = position;
var buffer = new byte[bufferSize];
// forever try
while (!ct.IsCancellationRequested) {
try {
// read current max length
var length = _position.Read();
sub.DebugKnownMaxOffset = length;
using (var prs = new PageReadStream(_messages, position, length, buffer)) {
using (var bin = new BinaryReader(prs)) {
while (prs.Position < prs.Length) {
var message = StorageFormat.Read(bin);
sub.Buffer.Enqueue(message);
sub.DebugEnqueuedOffset = prs.Position;
position = prs.Position;
while (sub.Buffer.Count >= cacheSize) {
ct.WaitHandle.WaitOne(500);
}
}
}
}
// wait till we get chance to advance
while (_position.Read() == position)
{
if (ct.WaitHandle.WaitOne(1000)) {
return;
}
}
}
catch (Exception ex) {
Debug.Print("Exception {0}", ex);
ct.WaitHandle.WaitOne(1000*5);
}
}
}