com.sleepycat.je.cleaner

Class FileProtector.ProtectedFileSet

java.lang.Object

com.sleepycat.je.cleaner.FileProtector.ProtectedFileSet

Direct Known Subclasses:

FileProtector.ProtectedActiveFileSet, FileProtector.ProtectedFileRange

Enclosing class:

FileProtector

public abstract static class FileProtector.ProtectedFileSet
extends Object

A ProtectedFileSet is used to prevent a set of files from being deleted. Implementations must meet two special requirements: 1. After a ProtectedFileSet is added using FileProtector.addFileProtection(com.sleepycat.je.cleaner.FileProtector.ProtectedFileSet), its set of protected files (the set for which isProtected(java.lang.Long, com.sleepycat.je.cleaner.FileProtector.ReservedFileInfo) returns true) may only be changed by shrinking the set. Files may not be added to the set of protected files. (One exception is that newly created files are effectively to a file set defined as an opened ended range.) 2. Shrinking the protected set can be done without synchronization on FileProtector. However, implementations should ensure that changes made in one thread are visible to all threads. The intention is to allow protecting a set of files that are to be processed in some way, and allow easily shrinking this set as the files are processed, so that the processed files may be deleted. Changes to the protected set should be visible to all threads so that periodic disk space reclamation tasks can delete unprotected files ASAP. FileProtector.ProtectedFileRange is a simple class that meets these requirements.

Method Summary

Modifier and Type	Method and Description
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail

toString

public String toString()

Overrides:

toString in class Object