the begginning

utils/testbc/fileblockrequestqueue.h

@@ -0,0 +1,111 @@
+/* Copyright (C) 2014 InfiniDB, Inc.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation; version 2 of
+   the License.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA. */
+
+#ifndef FILEBLOCKREQUESTQUEUE_H
+#define FILEBLOCKREQUESTQUEUE_H
+
+/***************************************************************************
+ *
+ *   $Id: fileblockrequestqueue.h 483 2008-02-10 20:23:28Z rdempsey $
+ *
+ *   jrodriguez@calpont.com   *
+ *                                                                         *
+***************************************************************************/
+ 
+
+#include <deque>
+#include <pthread.h>
+#include <iostream>
+#include "filerequest.h"
+
+
+/**
+	@author Jason Rodriguez <jrodriguez@calpont.com>
+*/
+
+/**
+ * @brief definition of the block request queue as stl std::priority_queue
+ **/
+namespace dbbc {
+ 
+typedef std::deque<fileRequest*> fileBlockRequestQueue_t;
+
+/**
+ * @brief class to hold requests for disk blocks in a queue. sorted by the size of a request
+ **/
+
+
+class fileBlockRequestQueue {
+	
+public:
+	
+	/**
+	 * @brief default ctor
+	 **/
+	fileBlockRequestQueue();
+
+	/**
+	 * @brief dtor
+	 **/
+	virtual ~fileBlockRequestQueue();
+
+	/**
+	 * @brief add a request to the queue
+	 **/
+	int push(fileRequest& blk);
+
+	/**
+	 * @brief get the next request from the queue and delete it from the queue
+	 **/
+	fileRequest* pop(void);
+
+	/**
+	 * @brief true if no reuquests are in the queue. false if there are requests in the queue
+	 **/
+	bool empty() const;
+
+	/**
+	 * @brief number of requests in the queue
+	 **/
+	uint32_t size() const {return queueSize;}
+
+	/**
+	 * @brief queue will stop accecpting requests in preparation for the dtor
+	 **/
+	void stop();
+	
+protected:
+	pthread_mutex_t mutex;
+	pthread_cond_t notEmpty;
+	fileBlockRequestQueue_t fbQueue;
+	uint32_t queueSize;
+	uint32_t readersWaiting;
+
+private:
+	// do not implement
+	fileBlockRequestQueue(const fileBlockRequestQueue& Q){}
+	const fileBlockRequestQueue& operator=(const fileBlockRequestQueue& Q);
+
+	/**
+	 * @brief pointer to the next request to be popped from the queue
+	 **/
+	fileRequest* top() const;
+
+	
+};
+}
+#endif