69 lines
1.6 KiB
C++
69 lines
1.6 KiB
C++
#ifndef DirectoryScanner_included
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#define DirectoryScanner_included
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#include "Scanner.h"
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#include <stddef.h>
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#include <sys/types.h>
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#include <sys/dir.h>
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#include "Event.h"
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class Client;
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class Directory;
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class DirEntry;
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// DirectoryScanner scans a directory for created or deleted files.
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// It is an object because a scan can be interrupted when the output
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// stream becomes blocked.
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//
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// The interface is quite weird. Each time the done() method is called,
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// it does as much work as it can, until output is blocked. Then
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// it returns true or false depending on whether it got done.
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//
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// This whole flow control thing needs a good redesign.
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//
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// Since a large number of DirectoryScanners is created, we have our
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// own new and delete operators. They cache the most recently freed
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// DirectoryScanner for re-use.
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class DirectoryScanner : public Scanner {
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public:
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typedef void (*DoneHandler)(DirectoryScanner *, void *closure);
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DirectoryScanner(Directory&, const Event&, Boolean, DoneHandler, void *);
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virtual ~DirectoryScanner();
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virtual Boolean done();
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void *operator new (size_t);
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void operator delete (void *);
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private:
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// Instance Variables
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Directory& directory;
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const DoneHandler done_handler;
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void *const closure;
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const Event new_event;
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const Boolean scan_entries;
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DIR *dir;
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int openErrno;
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DirEntry **epp;
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DirEntry *discard;
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// Class Variable
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static DirectoryScanner *cache;
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// Private Instance Methods
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DirEntry **match_name(DirEntry **epp, const char *name);
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};
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#endif /* !DirectoryScanner_included */
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