Class GcLogTail

Namespace

McServerLauncher.Services

Assembly

McServerLauncher.dll

Reads the lines a file gains, between one call and the next: the GC log the JVM keeps writing.

public sealed class GcLogTail

Inheritance

object

GcLogTail

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.ReferenceEquals(object, object)

object.ToString()

Remarks

The JVM owns the file, so it is opened letting it go on writing, rotating and deleting (FileShare.ReadWrite | Delete). A line the JVM is half way through writing is left for the next call. When the JVM rotates the log, the file the app was reading becomes gc.log.0 and a new gc.log starts; that shows as a shorter file or a different beginning (every JVM log opens with its own uptime stamps), and reading starts again at the top. A creation time would be simpler, but Linux filesystems often cannot tell it.

At most MaxBytesPerRead per call, so a long-forgotten tray window catching up never holds anything for long. Blocking file I/O: call it off the UI thread.

Constructors

GcLogTail(string)

public GcLogTail(string path)

Parameters

path string

Fields

MaxBytesPerRead

The most one call reads.

public const int MaxBytesPerRead = 262144

Field Value

int

Methods

ReadNewLines()

The complete lines written since the last call. Empty when the file is not there (yet).

public IReadOnlyList<string> ReadNewLines()

Returns

IReadOnlyList<string>