text: /*
   * Copyright (c) 2008-2011 Plausible Labs Cooperative, Inc.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the copyright holder nor the names of any contributors
   *    may be used to endorse or promote products derived from this
   *    software without specific prior written permission.
   * 
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   */
  
  #import <ObjFW/OFObject.h>
  #import <ObjFW/threading.h>
  
  #ifndef PL_DB_PRIVATE
  @class PLSqliteStatementCache;
  #else
  @class OFMutableDictionary;
  @class OFMutableSet;
  
  #include <sqlite3.h>
  
  @interface PLSqliteStatementCache : OFObject {
  @private
      /** Maximum size. */
      size_t _capacity;
      
      /** Current size. */
      size_t _size;
  
      /** Maps the query string to a CFMutableArrayRef containing sqlite3_stmt instances. We claim ownership for these statements. */
      OFMutableDictionary *_availableStatements;
      
      /** All live statements (whether or not they're checked out). */
      OFMutableSet* _allStatements;
  
      /** Internal lock. Must be held when mutating state. */
      of_spinlock_t _lock;
  }
  
  - (instancetype) initWithCapacity: (size_t) capacity;
  
  - (void) close;
  
  - (void) registerStatement: (sqlite3_stmt *) stmt;
  
  - (void) checkinStatement: (sqlite3_stmt *) stmt forQuery: (OFString *) query;
  
  - (sqlite3_stmt *) checkoutStatementForQueryString: (OFString *) query;
  
  - (void) removeAllStatements;
  
  @end
  
  #endif /* PL_DB_PRIVATE */