public Boolean TryAcquireLock()
{
if (!LockHelper.LockExists(Path))
{
return(AcquireLock());
}
FileLockContent content = LockHelper.ReadLock(Path);
//Someone else owns the lock
if (content.GetType() == typeof(OtherProcessOwnsFileLockContent))
{
return(false);
}
//the file no longer exists
if (content.GetType() == typeof(MissingFileLockContent))
{
return(AcquireLock());
}
DateTime writeTime = new DateTime(content.Timestamp);
//This lock belongs to this process - we can reacquire the lock
if (content.PID == Process.GetCurrentProcess().Id)
{
return(AcquireLock());
}
//The lock has not timed out - we can't acquire it
return(Math.Abs((DateTime.Now - writeTime).TotalSeconds) > Timeout.TotalSeconds && AcquireLock());
}
public static bool WriteLock(string lockFilePath, FileLockContent lockContent)
{
try
{
using (var stream = File.Create(lockFilePath))
{
JsonSerializer.WriteObject(stream, lockContent);
}
return(true);
}
catch (Exception)
{
return(false);
}
}
public static bool WriteLock(string lockFilePath, FileLockContent lockContent)
{
try
{
using (var stream = File.Create(lockFilePath))
{
JsonSerializer.WriteObject(stream, lockContent);
}
return true;
}
catch (Exception)
{
return false;
}
}
public static Boolean WriteLock(String path, FileLockContent content)
{
try
{
using FileStream stream = File.Create(path);
JsonSerializer.WriteObject(stream, content);
return(true);
}
catch (Exception)
{
return(false);
}
}
public static bool WriteLock(string lockFilePath, FileLockContent lockContent)
{
try
{
var obj = new JObject();
// type is only required for forward compatibility.
// older versions of this library used DataContractJsonSerializer to read/write the lock file contents.
// by writing out the old type value, it allows older versions of this library to continue to be able
// to read the lock files correctly.
obj["__type"] = "FileLockContent:#Palaso.IO.FileLock";
obj["PID"] = lockContent.PID;
obj["ProcessName"] = lockContent.ProcessName;
obj["Timestamp"] = lockContent.Timestamp;
using (StreamWriter streamWriter = new StreamWriter(File.Create(lockFilePath)))
{
obj.WriteTo(new JsonTextWriter(streamWriter));
}
return(true);
}
catch (Exception)
{
return(false);
}
}
public static bool WriteLock(string lockFilePath, FileLockContent lockContent)
{
try
{
var obj = new JObject();
// type is only required for forward compatibility.
// older versions of this library used DataContractJsonSerializer to read/write the lock file contents.
// by writing out the old type value, it allows older versions of this library to continue to be able
// to read the lock files correctly.
obj["__type"] = "FileLockContent:#Palaso.IO.FileLock";
obj["PID"] = lockContent.PID;
obj["ProcessName"] = lockContent.ProcessName;
obj["Timestamp"] = lockContent.Timestamp;
using (StreamWriter streamWriter = new StreamWriter(File.Create(lockFilePath)))
{
obj.WriteTo(new JsonTextWriter(streamWriter));
}
return true;
}
catch (Exception)
{
return false;
}
}
