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SQLClientPool.m
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/* -*-objc-*- */
/** Implementation of SQLClientPool for GNUStep
Copyright (C) 2014 Free Software Foundation, Inc.
Written by: Richard Frith-Macdonald <[email protected]>
Date: June 2014
This file is part of the SQLClient Library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA.
$Date: 2014-05-19 10:31:02 +0100 (Mon, 19 May 2014) $ $Revision: 37893 $
*/
#import <Foundation/NSArray.h>
#import <Foundation/NSAutoreleasePool.h>
#import <Foundation/NSDebug.h>
#import <Foundation/NSDictionary.h>
#import <Foundation/NSException.h>
#import <Foundation/NSInvocation.h>
#import <Foundation/NSLock.h>
#import <Foundation/NSString.h>
#import <Foundation/NSThread.h>
#import <Foundation/NSUserDefaults.h>
#import <Performance/GSCache.h>
#import "SQLClient.h"
struct _SQLClientPoolItem {
SQLClient *c; /** The clients of the pool. */
NSThread *o; /** The thread owning the client */
NSUInteger u; /** Count of client usage. */
NSTimeInterval t; /** When client was removed from pool. */
};
@interface SQLClient(Pool)
- (void) _clearPool: (SQLClientPool*)p;
- (void) _waitPool: (NSTimeInterval)ti;
@end
@implementation SQLClient(Pool)
- (void) _clearPool: (SQLClientPool*)p
{
NSAssert(_pool == p, NSInternalInconsistencyException);
_pool = nil;
}
- (void) _waitPool: (NSTimeInterval)ti
{
_waitPool = ti;
}
@end
@interface SQLClientPool (Adjust)
+ (void) _adjustPoolConnections: (int)n;
@end
@interface SQLClientPool (Private)
- (void) _lock;
- (SQLClient*) _provideClientBeforeDate: (NSDate*)when
exclusive: (BOOL)isLocal
blocked: (NSTimeInterval*)ti;
- (SQLClient*) _provide;
- (NSString*) _rc: (SQLClient*)o;
- (void) _unlock;
@end
@interface SQLTransaction (Creation)
+ (SQLTransaction*) _transactionUsing: (id)clientOrPool
batch: (BOOL)isBatched
stop: (BOOL)stopOnFailure;
@end
@implementation SQLClientPool
#if defined(GNUSTEP)
static Class cls = Nil;
+ (void) initialize
{
if (Nil == cls)
{
cls = [NSAutoreleasePool class];
}
}
#endif
- (int) availableConnections
{
int available;
int index;
[self _lock];
available = index = _max;
while (index-- > 0)
{
if (_items[index].u > 0)
{
available--;
}
}
[self _unlock];
return available;
}
- (SQLTransaction*) batch: (BOOL)stopOnFailure
{
return [SQLTransaction _transactionUsing: self
batch: YES
stop: stopOnFailure];
}
- (GSCache*) cache
{
return [_items[0].c cache];
}
- (uint64_t) committed
{
NSUInteger index;
uint64_t total = 0;
[_lock lock];
for (index = 0; index < _max; index++)
{
SQLClient *client = _items[index].c;
total += [client committed];
}
[_lock unlock];
return total;
}
- (void) dealloc
{
SQLClientPoolItem *old;
int count;
int i;
[_lock lock];
count = _max;
old = _items;
_max = 0;
_min = 0;
_items = 0;
if (0 != old)
{
for (i = 0; i < count; i++)
{
[old[i].c _clearPool: self];
[old[i].o release];
if (0 == old[i].u)
{
[old[i].c release];
}
}
free(old);
}
[_lock unlock];
DESTROY(_lock);
DESTROY(_config);
DESTROY(_name);
[SQLClientPool _adjustPoolConnections: -count];
[super dealloc];
}
- (NSString*) description
{
return [NSString stringWithFormat: @"%@ '%@'", [super description], _name];
}
- (id) initWithConfiguration: (NSDictionary*)config
name: (NSString*)reference
max: (int)maxConnections
min: (int)minConnections
{
if (nil != (self = [super init]))
{
if (nil == config)
{
config = (NSDictionary*)[NSUserDefaults standardUserDefaults];
}
ASSIGN(_config, config);
if (NO == [reference isKindOfClass: [NSString class]])
{
reference = [_config objectForKey: @"SQLClientName"];
if (NO == [reference isKindOfClass: [NSString class]])
{
reference = @"Database";
}
}
ASSIGNCOPY(_name, reference);
_lock = [[NSConditionLock alloc] initWithCondition: 0];
[self setMax: maxConnections min: minConnections];
}
return self;
}
- (NSString*) longDescription
{
NSMutableString *s = [[NSMutableString new] autorelease];
[s appendString: [self description]];
[s appendString: @", "];
[s appendString: [self status]];
[s appendString: [self statistics]];
[s appendString: [_items[0].c description]];
return s;
}
- (int) maxConnections
{
return _max;
}
- (int) minConnections
{
return _min;
}
- (NSString*) name
{
return _name;
}
- (SQLClient*) provideClient
{
return [self provideClientBeforeDate: nil exclusive: NO];
}
- (SQLClient*) provideClientBeforeDate: (NSDate*)when
{
return [self provideClientBeforeDate: when exclusive: NO];
}
- (SQLClient*) provideClientBeforeDate: (NSDate*)when exclusive: (BOOL)isLocal
{
return [self _provideClientBeforeDate: when
exclusive: isLocal
blocked: (NSTimeInterval*)NULL];
}
- (SQLClient*) provideClientExclusive
{
return [self provideClientBeforeDate: nil exclusive: YES];
}
- (void) purge
{
BOOL more = YES;
[self _lock];
while (YES == more)
{
SQLClient *found = nil;
int connected = 0;
int index;
more = NO;
for (index = 0; index < _max; index++)
{
if (YES == [_items[index].c connected])
{
/* This is a connected client.
*/
connected++;
if (0 == _items[index].u)
{
/* Not in use; so a candidate to be purged
*/
found = [_items[index].c longestIdle: found];
}
}
}
if (nil != found)
{
NSTimeInterval age;
age = -[[found lastOperation] timeIntervalSinceNow];
if (_debugging > 2)
{
NSLog(@"%@ purge found %p age %g",
self, found, age);
}
if (age > _purgeAll
|| (connected > _min && age > _purgeMin))
{
NS_DURING
{
[found disconnect];
more = YES;
}
NS_HANDLER
{
NSLog(@"Error disconnecting client in pool: %@",
localException);
}
NS_ENDHANDLER
}
}
}
[self _unlock];
}
- (void) setCache: (GSCache*)aCache
{
int index;
/* We don't allow a nil cache for the pool (each client would create its
* own cache on demand). So we treat a nil cache as a request to create
* a new cache with the default config.
*/
[self _lock];
if (nil == aCache)
{
[_items[0].c setCache: nil];
aCache = [_items[0].c cache];
}
for (index = 1; index < _max; index++)
{
[_items[index].c setCache: aCache];
}
[self _unlock];
}
- (void) setCacheThread: (NSThread*)aThread
{
int index;
[self _lock];
for (index = 0; index < _max; index++)
{
[_items[index].c setCacheThread: aThread];
}
[self _unlock];
}
- (void) setDebugging: (unsigned int)level
{
int index;
[self _lock];
_debugging = level;
for (index = 0; index < _max; index++)
{
[_items[index].c setDebugging: _debugging];
}
[self _unlock];
}
- (void) setDurationLogging: (NSTimeInterval)threshold
{
int index;
[self _lock];
_duration = threshold;
for (index = 0; index < _max; index++)
{
[_items[index].c setDurationLogging: _duration];
}
[self _unlock];
}
- (void) setMax: (int)maxConnections min: (int)minConnections
{
int old;
int index;
if (minConnections < 1) minConnections = 1;
if (maxConnections < 1) maxConnections = 5;
if (maxConnections > 100) maxConnections = 100;
if (minConnections > maxConnections) minConnections = maxConnections;
[self _lock];
old = _max;
if (maxConnections != _max)
{
GSCache *cache = nil;
if (_max > 0)
{
while (_max > maxConnections)
{
_max--;
[_items[_max].c _clearPool: self];
if (0 == _items[_max].u)
{
[_items[_max].c release];
}
DESTROY(_items[_max].o);
}
_items = realloc(_items, maxConnections * sizeof(SQLClientPoolItem));
}
else
{
_items = calloc(maxConnections, sizeof(SQLClientPoolItem));
}
for (index = _max; index < maxConnections; index++)
{
_items[index].o = nil;
_items[index].t = 0.0;
_items[index].u = 0;
_items[index].c = [[SQLClient alloc] initWithConfiguration: _config
name: _name
pool: self];
/* All the clients in the pool should share the same cache.
*/
if (0 == index)
{
cache = [_items[index].c cache];
}
else
{
[_items[index].c setCache: cache];
}
}
_max = maxConnections;
[SQLClientPool _adjustPoolConnections: _max - old];
}
_min = minConnections;
[self _unlock];
}
- (void) setPurgeAll: (int)allSeconds min: (int)minSeconds
{
if (allSeconds < 1)
{
allSeconds = 300;
}
if (minSeconds < 1)
{
minSeconds = 10;
}
if (allSeconds < minSeconds)
{
allSeconds = minSeconds;
}
_purgeMin = minSeconds;
_purgeAll = allSeconds;
}
- (NSString*) statistics
{
NSString *s;
s = [NSString stringWithFormat:
@" Immediate provisions: %llu\n"
@" Delayed provisions: %llu\n"
@" Timed out provisions: %llu\n"
@" Slowest provision: %g\n"
@" Average delay: %g\n"
@" Average timeout: %g\n"
@" Average over all: %g\n"
@" Committed transactions: %"PRIu64"\n",
(unsigned long long)_immediate,
(unsigned long long)_delayed,
(unsigned long long)_failed,
_longest,
(_delayed > 0) ? _delayWaits / _delayed : 0.0,
(_failed > 0) ? _failWaits / _failed : 0.0,
(_immediate + _delayed + _failed) > 0
? (_failWaits + _delayWaits) / (_immediate + _delayed + _failed)
: 0.0,
[self committed]];
return s;
}
- (NSString*) status
{
NSMutableArray *idleInfo = nil;
NSMutableArray *liveInfo = nil;
NSMutableString *retainInfo = nil;
unsigned int cond = 0;
unsigned int free = 0;
unsigned int dead = 0;
unsigned int idle = 0;
unsigned int live = 0;
unsigned int used = 0;
int index;
NSMutableString *s;
[_lock lock];
for (index = 0; index < _max; index++)
{
SQLClient *client = _items[index].c;
NSThread *owner = _items[index].o;
NSUInteger rc = [client retainCount];
NSUInteger uc = _items[index].u;
/* Check to see if this client is free to be taken from the pool.
* Also, if a client is connected but not in use, we call it idle.
*/
if (uc > 0)
{
NSString *tmp;
if (NSNotFound == uc)
{
tmp = [NSString stringWithFormat: @" Client '%@'"
@" provided to %@ exclusively (retained:%"PRIuPTR,
[client name], owner, rc];
}
else
{
tmp = [NSString stringWithFormat: @" Client '%@'"
@" provided to %@ %"PRIuPTR
@" time%s (retained:%"PRIuPTR,
[client name], owner, uc, ((1 == uc) ? "" : "s"), rc];
}
#if defined(GNUSTEP)
NSUInteger ac = [cls autoreleaseCountForObject: client];
tmp = [tmp stringByAppendingFormat: @" - autoreleased:%"PRIuPTR, ac];
#endif
/* This is a client which has been provided by the pool,
* so it is in use by some code.
*/
if (YES == [client isInTransaction])
{
NSDate *d = [client lastOperation];
live++;
if (nil == liveInfo)
{
liveInfo = [NSMutableArray array];
}
[liveInfo addObject: [tmp stringByAppendingFormat:
@") active in transaction since %@\n", d]];
}
else
{
if (YES == [client connected])
{
NSDate *d = [client lastOperation];
used++;
if (nil == d)
{
d = [client lastConnect];
}
if ([d timeIntervalSinceReferenceDate] < _items[index].t)
{
d = [NSDate dateWithTimeIntervalSinceReferenceDate:
_items[index].t];
}
if (nil == idleInfo)
{
idleInfo = [NSMutableArray array];
}
[idleInfo addObject: [tmp stringByAppendingFormat:
@") taken from pool but idle since %@\n", d]];
}
else
{
idle++;
[idleInfo addObject: [tmp stringByAppendingFormat:
@") taken from pool and recently used\n"]];
}
}
}
else
{
BOOL connected = [_items[index].c connected];
/* The client is not in use and can be provided by the pool,
* so we must therefore re-lock with condition 1.
*/
cond = 1;
if (_debugging > 0)
{
if (nil == retainInfo)
{
retainInfo = [NSMutableString stringWithCapacity: 100];
}
[retainInfo appendFormat:
@" Client '%@' (retain count %"PRIuPTR
@") %s pool %s connected to server\n",
[client name], rc,
((_items[index].u > 0) ? "taken from" : "available in"),
((YES == connected) ? "and" : "but not")];
}
if (YES == connected)
{
/* Still connected, so we count it as a free connection.
*/
free++;
}
else
{
/* Not connected, so we count it as a dead connection.
*/
dead++;
}
}
}
s = [NSMutableString stringWithFormat: @" size min: %u, max: %u\n"
@" live:%u, used:%u, idle:%u, free:%u, dead:%u\n",
_min, _max, live, used, idle, free, dead];
if (liveInfo)
{
for (index = 0; index < [liveInfo count]; index++)
{
[s appendString: [liveInfo objectAtIndex: index]];
}
}
if (idleInfo)
{
for (index = 0; index < [idleInfo count]; index++)
{
[s appendString: [idleInfo objectAtIndex: index]];
}
}
if (retainInfo)
{
[s appendString: retainInfo];
}
[_lock unlockWithCondition: cond];
return s;
}
- (BOOL) _swallowClient: (SQLClient*)client explicit: (BOOL)swallowed
{
BOOL found = NO;
int index;
if (YES == [client isInTransaction])
{
/* The client has a transaction in progress ... if it's in the
* current thread we should be able to disconnect (implicit rollback)
* and return the client to the pool, otherwise we raise an exception.
*/
if (YES == [client lockBeforeDate: nil])
{
[client disconnect];
[client unlock];
NSLog(@"ERROR: Disconnected client which was returned to pool"
@" while a transaction was in progress: %@", client);
}
else
{
[NSException raise: SQLConnectionException
format: @"failed to return to pool because a transaction"
@" was in progress: %@", client];
}
}
/* The client must not have any observers if it's in a pool.
*/
[client removeObserver: nil name: nil];
[self _lock];
for (index = 0; index < _max && NO == found; index++)
{
if (_items[index].u > 0 && client == _items[index].c)
{
found = YES;
if (YES == swallowed)
{
if (NSNotFound == _items[index].u || 1 == _items[index].u)
{
/* This was only provided once, and has been explicitly
* swallowed by the pool again, so we should increment
* the reference count to prevent an implicit swallow
* caused by deallocation.
*/
_items[index].u = 0;
if (client)
{
NSIncrementExtraRefCount(client);
}
}
else
{
_items[index].u--;
}
}
else
{
/* Nothing is using this client connection any more (it had
* -dealloc called), so we know the count must be zero.
*/
_items[index].u = 0;
}
if (0 == _items[index].u)
{
DESTROY(_items[index].o);
}
}
}
[self _unlock];
if (_debugging > 2)
{
if (YES == found)
{
NSLog(@"%@ swallows %p%@", self, client, [self _rc: client]);
}
else
{
NSLog(@"%@ rejects %p%@", self, client, [self _rc: client]);
}
}
return found;
}
- (BOOL) swallowClient: (SQLClient*)client
{
return [self _swallowClient: client explicit: YES];
}
- (void) setClientName: (NSString*)s
{
unsigned int index;
[self _lock];
for (index = 0; index < _max; index++)
{
SQLClient *client = _items[index].c;
if (nil == s)
{
[client setClientName: s];
}
else
{
NSString *n;
n = [s stringByAppendingFormat: @" (%u)", index];
[client setClientName: n];
}
}
[self _unlock];
}
- (SQLTransaction*) transaction
{
return [SQLTransaction _transactionUsing: self
batch: NO
stop: NO];
}
@end
@implementation SQLClientPool (Private)
- (void) _lock
{
[_lock lock];
}
- (SQLClient*) _provideClientBeforeDate: (NSDate*)when
exclusive: (BOOL)isLocal
blocked: (NSTimeInterval*)ti
{
NSThread *thread = [NSThread currentThread];
NSTimeInterval start = [NSDate timeIntervalSinceReferenceDate];
NSTimeInterval now = start;
NSTimeInterval block = 0.0;
NSTimeInterval dif = 0.0;
SQLClient *client = nil;
int preferred = -1;
int found = -1;
int cond = 0;
int index;
/* If this is a request for a non-exclusive connection, we can simply
* check to see if there's already such a connection available.
*/
if (NO == isLocal)
{
if (NO == [_lock tryLock])
{
[_lock lock];
block = start;
}
for (index = 0; index < _max; index++)
{
if (_items[index].o == thread && _items[index].u < NSNotFound
&& NO == [_items[index].c isInTransaction])
{
preferred = index; // Ignore any other connected client
break;
}
if (nil == _items[index].o && 0 == _items[index].u)
{
if (preferred < 0 && YES == [_items[index].c connected])
{
preferred = index;
}
else
{
found = index;
}
}
}
if (preferred >= 0)
{
found = preferred; // Prefer a connected client.
}
if (found >= 0)
{
_items[found].t = now;
if (0 == _items[found].u++)
{
ASSIGN(_items[found].o, thread);
client = [_items[found].c autorelease];
}
else
{
/* We have already provided this client, so we must retain it
* before we autorelease it, to keep retain counts in sync.
*/
client = [[_items[found].c retain] autorelease];
}
_immediate++;
}
[self _unlock];
if (nil != client)
{
if (_debugging > 2)
{
NSLog(@"%@ provides %p%@",
self, _items[found].c, [self _rc: client]);
}
if (ti)
{
*ti = block;
}
return client;
}
}
/* If we haven't been given a timeout, we should wait for a client
* indefinitely ... so we set the timeout to be in the distant future.
*/
if (nil == when)
{
static NSDate *future = nil;
if (nil == future)
{
future = RETAIN([NSDate distantFuture]);
}
when = future;
}
/* We want to log stuff if we don't get a client quickly.
* Ideally we get the lock straight away,
* but if not we want to log every ten seconds (and possibly
* when we begin waiting).
*/
if ([_lock tryLockWhenCondition: 1])
{
_immediate++;
}
else
{
NSTimeInterval end = [when timeIntervalSinceReferenceDate];
NSDate *until;
BOOL locked;
block = start;
if (_debugging > 1)
{
NSLog(@"%@ has no clients available", self);
}
until = [[NSDate alloc]
initWithTimeIntervalSinceReferenceDate: now + 10.0];
locked = NO;
while (NO == locked && now < end)
{
if (now >= end)
{
/* End date is passed ... try to get the lock immediately.
*/
locked = [_lock tryLockWhenCondition: 1];
}
else if ([when earlierDate: until] != when)
{
locked = [_lock lockWhenCondition: 1 beforeDate: until];
}
else
{
locked = [_lock lockWhenCondition: 1 beforeDate: when];
}
now = [NSDate timeIntervalSinceReferenceDate];
dif = now - start;
if (NO == locked && now < end)
{
if (_debugging > 0 || dif > 30.0
|| (_duration >= 0.0 && dif > _duration))
{
NSLog(@"%@ still waiting after %g seconds:\n%@%@\n",
self, dif, [self status], [NSThread callStackSymbols]);
}
[until release];
until = [[NSDate alloc] initWithTimeIntervalSinceNow: 10.0];
}
}
[until release];
if (dif > _longest)
{
_longest = dif;
}
if (NO == locked)
{
if (_debugging > 0 || dif > 30.0
|| (_duration >= 0.0 && dif > _duration))
{
NSLog(@"%@ abandoned wait after %g seconds:\n%@",
self, dif, [self status]);
}
_failed++;
_failWaits += dif;
if (ti)
{
*ti = block;
}
return nil;
}
_delayed++;
_delayWaits += dif;
}
for (index = 0; index < _max && 0 == cond; index++)
{
if (0 == _items[index].u)
{
if (preferred >= 0 || found >= 0)
{
/* There's at least one more client available to be
* provided, so we want to re-lock with condition 1.
*/
cond = 1;
}
if (preferred < 0 && YES == [_items[index].c connected])
{
preferred = index;
}
else
{
found = index;
}
}
else if (NO == isLocal
&& _items[index].o == thread
&& _items[index].u < NSNotFound
&& NO == [_items[index].c isInTransaction])
{
/* We are allowed to re-use connections in the current thread,
* so if we have found one, treat it as the preferred choice.
*/
preferred = index;
}
}
/* We prefer to use a client which is already connected, so we
* avoid opening unnecessary connections.
*/
if (preferred >= 0)
{
found = preferred;
}
if (YES == isLocal)
{
_items[found].u = NSNotFound;
}
else
{
_items[found].u++;
}
_items[found].t = now;
ASSIGN(_items[found].o, thread);
[self _unlock];
client = [_items[found].c autorelease];
if (_debugging > 0 || (_duration >= 0.0 && dif > _duration))
{
NSLog(@"%@ provided client %p after %g seconds", self, client, dif);
}
if (_debugging > 2)
{
NSLog(@"%@ provides %p %@", self, client, [self _rc: client]);