/// <summary>
/// Reads a log message from the specified sqlite reader.
/// </summary>
/// <param name="reader">Sqlite reader to read from.</param>
/// <param name="message">Receives the read log message.</param>
private void ReadMessage(SQLiteDataReader reader, out LogFileMessage message)
{
// columns in result:
// 0 = message id
// 1 = timestamp
// 2 = timezone offset
// 3 = high precision timestamp
// 4 = lost message count
// 5 = process id
// 6 = process name
// 7 = application name
// 8 = log writer name
// 9 = log level name
// 10 = has tags
// 11 = text name
long messageId = reader.GetInt64(0);
var timezoneOffset = TimeSpan.FromTicks(reader.GetInt64(2));
var timestamp = new DateTimeOffset(reader.GetInt64(1) + timezoneOffset.Ticks, timezoneOffset);
long highPrecisionTimestamp = reader.GetInt64(3);
int lostMessageCount = reader.GetInt32(4);
int processId = reader.GetInt32(5);
string processName = reader.GetString(6);
string applicationName = reader.GetString(7);
string logWriterName = reader.GetString(8);
string logLevelName = reader.GetString(9);
bool hasTags = reader.GetBoolean(10);
string text = reader.GetString(11);
message = new LogFileMessage().InitWith(
messageId,
timestamp,
highPrecisionTimestamp,
lostMessageCount,
mStringPool.Intern(logWriterName),
mStringPool.Intern(logLevelName),
TagSet.Empty,
mStringPool.Intern(applicationName),
mStringPool.Intern(processName),
processId,
text);
// initialize tags, if there are tags associated with the message
if (hasTags)
{
message.Tags = mAccessor.GetTagsOfMessage(messageId);
}
// protect message from changes
message.Protect();
}
public void GetNextMessage(
bool isGloballyEnabled,
LogMessageField enabledSpecificFilters,
LogMessageField matchingSpecificFilters,
MatchBehavior matchBehavior,
double startIdRatio)
{
CreateFilterAndReferencePredicate(
isGloballyEnabled,
enabledSpecificFilters,
matchingSpecificFilters,
matchBehavior,
out var collection,
out var filter,
out var unfilteredMessages,
out var filteredMessages);
// calculate the id where to start searching
long startId = (long)(startIdRatio * (unfilteredMessages.Length - 1));
// determine the message that is expected to be returned
LogFileMessage expectedMessage = null; // assume no match at start, revise later
for (int i = filteredMessages.Length - 1; i >= 0; i--)
{
var message = filteredMessages[i];
if (message.Id < startId)
{
break;
}
expectedMessage = message;
}
using (collection)
using (filter)
{
var found = filter.GetNextMessage(startId);
Assert.Equal(expectedMessage, found);
}
}