mirror of
https://github.com/gnustep/libs-base.git
synced 2025-05-30 16:30:41 +00:00
Use placeholder class for efficiency
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@8957 72102866-910b-0410-8b05-ffd578937521
This commit is contained in:
Richard Frith-MacDonald
parent
2cf148585f
commit
e163d5932d
2 changed files with 320 additions and 200 deletions
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@ -3,6 +3,8 @@
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* Source/NSDate.m: pass dates over DO bycopy unless explicitly byref.
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* Source/NSTimeZone.m: pass time zones over DO bycopy unless
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explicitly byref.
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Use placeholder class for newly created objects - to improve
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eficiency of selection of classes in cluster.
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2001-01-30 Michael Hanni <mhanni@sprintmail.com>
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@ -64,6 +64,7 @@
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#include <Foundation/NSThread.h>
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#include <Foundation/NSNotification.h>
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#include <Foundation/NSPortCoder.h>
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#include <Foundation/NSDebug.h>
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#define NOID
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#include "tzfile.h"
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@ -99,6 +100,13 @@
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@class NSConcreteAbsoluteTimeZone;
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@class NSConcreteTimeZoneDetail;
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@class GSPlaceholderTimeZone;
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/*
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* Information for abstract placeholder class.
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*/
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static GSPlaceholderTimeZone *defaultPlaceholderTimeZone;
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static NSMapTable *placeholderMap;
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/* Temporary structure for holding time zone details. */
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struct ttinfo
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@ -124,6 +132,7 @@ static NSDictionary *fake_abbrev_dict;
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static NSRecursiveLock *zone_mutex = nil;
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static Class NSTimeZoneClass;
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static Class GSPlaceholderTimeZoneClass;
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/* Decode the four bytes at PTR as a signed integer in network byte order.
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Based on code included in the GNU C Library 2.0.3. */
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@ -171,6 +180,8 @@ decode (const void *ptr)
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- (char) detailIndex;
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@end
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@interface GSPlaceholderTimeZone : NSTimeZone
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@end
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@interface NSConcreteTimeZone : NSTimeZone
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{
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@ -313,6 +324,226 @@ decode (const void *ptr)
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@end
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@implementation GSPlaceholderTimeZone
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- (id) autorelease
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{
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NSWarnLog(@"-autorelease sent to uninitialised time zone");
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return self; // placeholders never get released.
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}
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- (id) objectAtIndex: (unsigned)index
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{
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[NSException raise: NSInternalInconsistencyException
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format: @"attempt to use uninitialised time zone"];
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return 0;
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}
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- (void) dealloc
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{
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return; // placeholders never get deallocated.
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}
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- (id) initWithName: (NSString*)name
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{
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NSTimeZone *zone;
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if ([name isEqual: @"NSLocalTimeZone"])
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{
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zone = RETAIN(localTimeZone);
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}
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else
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{
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static NSString *fileException = @"fileException";
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static NSString *errMess = @"File read error in NSTimeZone.";
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id transArray, detailsArray;
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int i, n_trans, n_types, names_size;
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id *abbrevsArray;
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char *trans, *type_idxs, *zone_abbrevs;
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struct tzhead header;
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struct ttinfo *types; // Temporary array for details
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FILE *file = NULL;
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NSString *fileName;
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if (zone_mutex != nil)
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{
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[zone_mutex lock];
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}
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zone = [zoneDictionary objectForKey: name];
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if (zone != nil)
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{
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IF_NO_GC(RETAIN(zone));
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if (zone_mutex != nil)
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{
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[zone_mutex unlock];
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}
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return zone;
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}
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i = [name length];
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if (i == 0)
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{
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NSLog(@"Disallowed null time zone name");
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if (zone_mutex != nil)
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{
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[zone_mutex unlock];
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}
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return nil;
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}
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else
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{
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const char *str = [name lossyCString];
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if ([name hasPrefix: @"NSAbsoluteTimeZone:"] == YES)
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{
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i = atoi(&str[19]);
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if (zone_mutex != nil)
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{
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[zone_mutex unlock];
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}
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zone = [[NSConcreteAbsoluteTimeZone alloc] initWithOffset: i];
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return zone;
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}
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/* Make sure that only time zone files are accessed.
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FIXME: Make this more robust. */
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if ((str)[0] == '/' || strchr(str, '.') != NULL)
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{
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NSLog(@"Disallowed time zone name `%@'.", name);
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if (zone_mutex != nil)
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{
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[zone_mutex unlock];
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}
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return nil;
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}
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}
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NS_DURING
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{
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zone = [NSConcreteTimeZone alloc];
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/* Open file. */
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fileName = [NSTimeZoneClass getTimeZoneFile: name];
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#if defined(__WIN32__)
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file = fopen([fileName fileSystemRepresentation], "rb");
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#else
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file = fopen([fileName fileSystemRepresentation], "r");
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#endif
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if (file == NULL)
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[NSException raise: fileException format: errMess];
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/* Read header. */
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if (fread(&header, sizeof(struct tzhead), 1, file) != 1)
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[NSException raise: fileException format: errMess];
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n_trans = decode(header.tzh_timecnt);
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n_types = decode(header.tzh_typecnt);
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names_size = decode(header.tzh_charcnt);
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/* Read in transitions. */
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trans = NSZoneMalloc(NSDefaultMallocZone(), 4*n_trans);
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type_idxs = NSZoneMalloc(NSDefaultMallocZone(), n_trans);
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if (fread(trans, 4, n_trans, file) != n_trans
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|| fread(type_idxs, 1, n_trans, file) != n_trans)
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[NSException raise: fileException format: errMess];
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transArray = [NSMutableArray arrayWithCapacity: n_trans];
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for (i = 0; i < n_trans; i++)
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[transArray
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addObject: [[NSInternalTimeTransition alloc]
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initWithTime: decode(trans+(i*4))
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withIndex: type_idxs[i]]];
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NSZoneFree(NSDefaultMallocZone(), trans);
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NSZoneFree(NSDefaultMallocZone(), type_idxs);
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/* Read in time zone details. */
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types =
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NSZoneMalloc(NSDefaultMallocZone(), sizeof(struct ttinfo)*n_types);
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for (i = 0; i < n_types; i++)
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{
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unsigned char x[4];
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if (fread(x, 1, 4, file) != 4
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|| fread(&types[i].isdst, 1, 1, file) != 1
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|| fread(&types[i].abbr_idx, 1, 1, file) != 1)
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[NSException raise: fileException format: errMess];
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types[i].offset = decode(x);
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}
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/* Read in time zone abbreviation strings. */
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zone_abbrevs = NSZoneMalloc(NSDefaultMallocZone(), names_size);
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if (fread(zone_abbrevs, 1, names_size, file) != names_size)
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[NSException raise: fileException format: errMess];
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abbrevsArray = NSZoneMalloc(NSDefaultMallocZone(),
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sizeof(id)*names_size);
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memset(abbrevsArray, '\0', sizeof(id)*names_size);
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for (i = 0; i < n_types; i++)
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{
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int pos = types[i].abbr_idx;
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if (abbrevsArray[pos] == nil)
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{
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abbrevsArray[pos]
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= [NSString stringWithCString: zone_abbrevs+pos];
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}
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}
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NSZoneFree(NSDefaultMallocZone(), zone_abbrevs);
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/* Create time zone details. */
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detailsArray = [NSMutableArray arrayWithCapacity: n_types];
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for (i = 0; i < n_types; i++)
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{
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NSConcreteTimeZoneDetail *detail;
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detail = [[NSConcreteTimeZoneDetail alloc]
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initWithTimeZone: zone
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withAbbrev: abbrevsArray[(int)types[i].abbr_idx]
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withOffset: types[i].offset
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withDST: (types[i].isdst > 0)];
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[detailsArray addObject: detail];
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RELEASE(detail);
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}
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NSZoneFree(NSDefaultMallocZone(), abbrevsArray);
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NSZoneFree(NSDefaultMallocZone(), types);
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zone = [(id)zone initWithName: name
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withTransitions: transArray
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withDetails: detailsArray];
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[zoneDictionary setObject: zone forKey: (NSString*)[zone name]];
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}
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NS_HANDLER
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{
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DESTROY(zone);
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if ([localException name] != fileException)
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[localException raise];
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NSLog(@"Unable to obtain time zone `%@'.", name);
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}
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NS_ENDHANDLER
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if (file != NULL)
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{
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fclose(file);
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}
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if (zone_mutex != nil)
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{
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[zone_mutex unlock];
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}
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}
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return zone;
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}
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- (void) release
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{
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return; // placeholders never get released.
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}
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- (id) retain
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{
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return self; // placeholders never get retained.
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}
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@end
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@implementation NSConcreteTimeZone
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@ -326,9 +557,6 @@ decode (const void *ptr)
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- (void) encodeWithCoder: (NSCoder*)aCoder
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{
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if (self == (id)localTimeZone)
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[aCoder encodeObject: @"NSLocalTimeZone"];
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else
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[aCoder encodeObject: name];
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}
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@ -400,6 +628,16 @@ decode (const void *ptr)
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return self;
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}
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- (void) encodeWithCoder: (NSCoder*)aCoder
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{
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[aCoder encodeObject: @"NSLocalTimeZone"];
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}
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- (NSString*) name
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{
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return [[NSTimeZoneClass defaultTimeZone] name];
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}
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- (void) release
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{
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}
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@ -409,11 +647,6 @@ decode (const void *ptr)
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return self;
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}
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- (NSString*) name
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{
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return [[NSTimeZoneClass defaultTimeZone] name];
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}
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- (NSArray*) timeZoneDetailArray
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{
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return [[NSTimeZoneClass defaultTimeZone] timeZoneDetailArray];
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@ -490,9 +723,9 @@ static NSMapTable *absolutes = 0;
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return name;
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}
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- (NSArray*) timeZoneDetailArray
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- (NSTimeZone*) timeZoneDetailTimeZone
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{
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return [NSArray arrayWithObject: detail];
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return [NSTimeZone arrayWithObject: detail];
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}
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- (NSTimeZoneDetail*) timeZoneDetailForDate: (NSDate*)date
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@ -512,13 +745,6 @@ static NSMapTable *absolutes = 0;
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[super dealloc];
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}
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- (void) encodeWithCoder: (NSCoder*)aCoder
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{
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[aCoder encodeObject: abbrev];
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[aCoder encodeValueOfObjCType: @encode(int) at: &offset];
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[aCoder encodeValueOfObjCType: @encode(BOOL) at: &is_dst];
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}
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- (id) initWithCoder: (NSCoder*)aDecoder
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{
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[aDecoder decodeValueOfObjCType: @encode(id) at: &abbrev];
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@ -631,6 +857,59 @@ static NSMapTable *absolutes = 0;
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return abbreviationDictionary;
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}
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+ (id) allocWithZone: (NSZone*)z
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{
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if (self == NSTimeZoneClass)
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{
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/*
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* We return a placeholder object that can
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* be converted to a real object when its initialisation method
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* is called.
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*/
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if (z == NSDefaultMallocZone() || z == 0)
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{
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/*
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* As a special case, we can return a placeholder for a time zone
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* in the default malloc zone extremely efficiently.
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*/
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return defaultPlaceholderTimeZone;
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}
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else
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{
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id obj;
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/*
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* For anything other than the default zone, we need to
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* locate the correct placeholder in the (lock protected)
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* table of placeholders.
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*/
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if (zone_mutex != nil)
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{
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[zone_mutex lock];
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}
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obj = (id)NSMapGet(placeholderMap, (void*)z);
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if (obj == nil)
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{
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/*
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* There is no placeholder object for this zone, so we
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* create a new one and use that.
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*/
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obj = (id)NSAllocateObject(GSPlaceholderTimeZoneClass, 0, z);
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NSMapInsert(placeholderMap, (void*)z, (void*)obj);
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}
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if (zone_mutex != nil)
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{
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[zone_mutex unlock];
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}
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return obj;
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}
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}
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else
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{
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return NSAllocateObject(self, 0, z);
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}
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}
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+ (NSTimeZone*) defaultTimeZone
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{
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NSTimeZone *zone;
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@ -658,8 +937,17 @@ static NSMapTable *absolutes = 0;
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if (self == [NSTimeZone class])
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{
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NSTimeZoneClass = self;
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GSPlaceholderTimeZoneClass = [GSPlaceholderTimeZone class];
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zoneDictionary = [[NSMutableDictionary alloc] init];
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/*
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* Set up infrastructure for placeholder timezones.
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*/
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defaultPlaceholderTimeZone = (GSPlaceholderTimeZone*)
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NSAllocateObject(GSPlaceholderTimeZoneClass, 0, NSDefaultMallocZone());
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placeholderMap = NSCreateMapTable(NSNonOwnedPointerMapKeyCallBacks,
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NSNonRetainedObjectMapValueCallBacks, 0);
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localTimeZone = [[NSLocalTimeZone alloc] init];
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[self setDefaultTimeZone: [self systemTimeZone]];
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@ -753,7 +1041,7 @@ static NSMapTable *absolutes = 0;
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}
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if (localZoneString != nil)
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{
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zone = RETAIN([NSTimeZoneClass timeZoneWithName: localZoneString]);
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zone = [defaultPlaceholderTimeZone initWithName: localZoneString];
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}
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else
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{
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@ -837,169 +1125,14 @@ static NSMapTable *absolutes = 0;
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+ (NSTimeZone*) timeZoneWithName: (NSString*)aTimeZoneName
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{
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static NSString *fileException = @"fileException";
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static NSString *errMess = @"File read error in NSTimeZone.";
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id zone, transArray, detailsArray;
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int i, n_trans, n_types, names_size;
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id *abbrevsArray;
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char *trans, *type_idxs, *zone_abbrevs;
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struct tzhead header;
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struct ttinfo *types; // Temporary array for details
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FILE *file = NULL;
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NSString *fileName;
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NSTimeZone *zone;
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if (zone_mutex != nil)
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[zone_mutex lock];
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zone = [zoneDictionary objectForKey: aTimeZoneName];
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if (zone != nil)
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{
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if (zone_mutex != nil)
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[zone_mutex unlock];
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return zone;
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}
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i = [aTimeZoneName length];
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if (i == 0)
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{
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NSLog(@"Disallowed null time zone name");
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if (zone_mutex != nil)
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[zone_mutex unlock];
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return nil;
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}
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else
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{
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const char *str = [aTimeZoneName lossyCString];
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if ([aTimeZoneName hasPrefix: @"NSAbsoluteTimeZone:"] == YES)
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{
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i = atoi(&str[19]);
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if (zone_mutex != nil)
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[zone_mutex unlock];
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zone = [[NSConcreteAbsoluteTimeZone alloc] initWithOffset: i];
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AUTORELEASE(zone);
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return zone;
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}
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/* Make sure that only time zone files are accessed.
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FIXME: Make this more robust. */
|
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if ((str)[0] == '/' || strchr(str, '.') != NULL)
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{
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NSLog(@"Disallowed time zone name `%@'.", aTimeZoneName);
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if (zone_mutex != nil)
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[zone_mutex unlock];
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return nil;
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}
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}
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NS_DURING
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{
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zone = [NSConcreteTimeZone alloc];
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|
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/* Open file. */
|
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fileName = [NSTimeZoneClass getTimeZoneFile: aTimeZoneName];
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#if defined(__WIN32__)
|
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file = fopen([fileName fileSystemRepresentation], "rb");
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#else
|
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file = fopen([fileName fileSystemRepresentation], "r");
|
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#endif
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if (file == NULL)
|
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[NSException raise: fileException format: errMess];
|
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|
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/* Read header. */
|
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if (fread(&header, sizeof(struct tzhead), 1, file) != 1)
|
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[NSException raise: fileException format: errMess];
|
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|
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n_trans = decode(header.tzh_timecnt);
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n_types = decode(header.tzh_typecnt);
|
||||
names_size = decode(header.tzh_charcnt);
|
||||
|
||||
/* Read in transitions. */
|
||||
trans = NSZoneMalloc(NSDefaultMallocZone(), 4*n_trans);
|
||||
type_idxs = NSZoneMalloc(NSDefaultMallocZone(), n_trans);
|
||||
if (fread(trans, 4, n_trans, file) != n_trans
|
||||
|| fread(type_idxs, 1, n_trans, file) != n_trans)
|
||||
[NSException raise: fileException format: errMess];
|
||||
transArray = [NSMutableArray arrayWithCapacity: n_trans];
|
||||
for (i = 0; i < n_trans; i++)
|
||||
[transArray
|
||||
addObject: [[NSInternalTimeTransition alloc]
|
||||
initWithTime: decode(trans+(i*4))
|
||||
withIndex: type_idxs[i]]];
|
||||
NSZoneFree(NSDefaultMallocZone(), trans);
|
||||
NSZoneFree(NSDefaultMallocZone(), type_idxs);
|
||||
|
||||
/* Read in time zone details. */
|
||||
types =
|
||||
NSZoneMalloc(NSDefaultMallocZone(), sizeof(struct ttinfo)*n_types);
|
||||
for (i = 0; i < n_types; i++)
|
||||
{
|
||||
unsigned char x[4];
|
||||
|
||||
if (fread(x, 1, 4, file) != 4
|
||||
|| fread(&types[i].isdst, 1, 1, file) != 1
|
||||
|| fread(&types[i].abbr_idx, 1, 1, file) != 1)
|
||||
[NSException raise: fileException format: errMess];
|
||||
types[i].offset = decode(x);
|
||||
}
|
||||
|
||||
/* Read in time zone abbreviation strings. */
|
||||
zone_abbrevs = NSZoneMalloc(NSDefaultMallocZone(), names_size);
|
||||
if (fread(zone_abbrevs, 1, names_size, file) != names_size)
|
||||
[NSException raise: fileException format: errMess];
|
||||
abbrevsArray = NSZoneMalloc(NSDefaultMallocZone(), sizeof(id)*names_size);
|
||||
memset(abbrevsArray, '\0', sizeof(id)*names_size);
|
||||
for (i = 0; i < n_types; i++)
|
||||
{
|
||||
int pos = types[i].abbr_idx;
|
||||
|
||||
if (abbrevsArray[pos] == nil)
|
||||
abbrevsArray[pos] = [NSString stringWithCString: zone_abbrevs+pos];
|
||||
}
|
||||
NSZoneFree(NSDefaultMallocZone(), zone_abbrevs);
|
||||
|
||||
/* Create time zone details. */
|
||||
detailsArray = [NSMutableArray arrayWithCapacity: n_types];
|
||||
for (i = 0; i < n_types; i++)
|
||||
{
|
||||
NSConcreteTimeZoneDetail *detail;
|
||||
|
||||
detail = [[NSConcreteTimeZoneDetail alloc]
|
||||
initWithTimeZone: zone
|
||||
withAbbrev: abbrevsArray[(int)types[i].abbr_idx]
|
||||
withOffset: types[i].offset
|
||||
withDST: (types[i].isdst > 0)];
|
||||
[detailsArray addObject: detail];
|
||||
RELEASE(detail);
|
||||
}
|
||||
NSZoneFree(NSDefaultMallocZone(), abbrevsArray);
|
||||
NSZoneFree(NSDefaultMallocZone(), types);
|
||||
|
||||
[zone initWithName: aTimeZoneName
|
||||
withTransitions: transArray
|
||||
withDetails: detailsArray];
|
||||
[zoneDictionary setObject: zone forKey: (NSString*)[zone name]];
|
||||
}
|
||||
NS_HANDLER
|
||||
{
|
||||
if (zone != nil)
|
||||
RELEASE(zone);
|
||||
zone = nil;
|
||||
if ([localException name] != fileException)
|
||||
[localException raise];
|
||||
NSLog(@"Unable to obtain time zone `%@'.", aTimeZoneName);
|
||||
}
|
||||
NS_ENDHANDLER
|
||||
|
||||
RELEASE(zone); /* retained in zoneDictionary. */
|
||||
|
||||
if (file != NULL)
|
||||
fclose(file);
|
||||
if (zone_mutex != nil)
|
||||
[zone_mutex unlock];
|
||||
return zone;
|
||||
zone = [defaultPlaceholderTimeZone initWithName: aTimeZoneName];
|
||||
return AUTORELEASE(zone);
|
||||
}
|
||||
|
||||
+ (NSTimeZone*) timeZoneWithName: (NSString*)name data: (NSData*)data
|
||||
|
||||
{
|
||||
[self notImplemented: _cmd];
|
||||
return nil;
|
||||
|
|
@ -1035,30 +1168,15 @@ static NSMapTable *absolutes = 0;
|
|||
|
||||
- (void) encodeWithCoder: (NSCoder*)aCoder
|
||||
{
|
||||
if (self == localTimeZone)
|
||||
{
|
||||
[aCoder encodeObject: @"NSLocalTimeZone"];
|
||||
}
|
||||
else
|
||||
{
|
||||
[aCoder encodeObject: [self name]];
|
||||
}
|
||||
}
|
||||
|
||||
- (id) initWithCoder: (NSCoder*)aDecoder
|
||||
{
|
||||
NSString *name;
|
||||
|
||||
[aDecoder decodeValueOfObjCType: @encode(id) at: &name];
|
||||
RELEASE(self);
|
||||
if ([name isEqual: @"NSLocalTimeZone"])
|
||||
{
|
||||
self = RETAIN(localTimeZone);
|
||||
}
|
||||
else
|
||||
{
|
||||
self = RETAIN([NSTimeZoneClass timeZoneWithName: name]);
|
||||
}
|
||||
name = [aDecoder decodeObject];
|
||||
self = [self initWithName: name];
|
||||
return self;
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue