Added getRecordType()

src/lladd/page.c

@@ -304,6 +304,48 @@ void readRecordUnlocked(int xid, Page * p, recordid rid, void *buf) {
   }
   assert(rid.page == p->id); 
 }
+/** @TODO getRecordType is a hack.  Instead, each record type should
+    implement code that decides whether a record exists, and returns its size
+    or -1.  Then, getRecordType coudl call that function directly depending on 
+	  page type, etc.
+
+	  A complementary function getRecordSize could return the size value.
+
+*/
+int getRecordTypeUnlocked(int xid, Page * p, recordid rid) {
+	assert(rid.page == p->id);
+	
+	int page_type = *page_type_ptr(p);
+	
+	if(page_type == UNINITIALIZED_PAGE) {
+		return UNINITIALIZED_RECORD;	
+		
+	} else if(rid.size > BLOB_THRESHOLD_SIZE) {
+//		printf("%d , %d\n", *numslots_ptr(p), *slot_length_ptr(p, rid.slot));
+		return(*numslots_ptr(p) > rid.slot &&
+		         *slot_length_ptr(p, rid.slot) == BLOB_REC_SIZE) ? 
+							BLOB_RECORD : UNINITIALIZED_RECORD;
+		
+	} else if(page_type == SLOTTED_PAGE) {
+		return (*numslots_ptr(p) > rid.slot && 
+						 *slot_length_ptr(p, rid.slot) != INVALID_SLOT) ?
+							SLOTTED_RECORD : UNINITIALIZED_RECORD;
+		
+	} else if(page_type == FIXED_PAGE || page_type == ARRAY_LIST_PAGE) {
+		return  (fixedPageCount(p) > rid.slot) ? 
+							FIXED_RECORD : UNINITIALIZED_RECORD;
+	} else {
+		abort();
+		return UNINITIALIZED_RECORD;
+	}
+}
+
+int getRecordType(int xid, Page * p, recordid rid) {
+	readlock(p->rwlatch, 343);
+	int ret = getRecordTypeUnlocked(xid, p, rid);
+	unlock(p->rwlatch);
+	return ret;
+}
 
 void writeRecordUnlocked(int xid, Page * p, lsn_t lsn, recordid rid, const void *dat) {
 

src/lladd/page.h

@@ -88,7 +88,7 @@ terms specified in this license.
 
 #include <lladd/transactional.h>
 #include <lladd/bufferManager.h>
-
+#include "../../src/lladd/page.h"
 
 
 BEGIN_C_DECLS
@@ -111,6 +111,13 @@ BEGIN_C_DECLS
 
 #define USABLE_SIZE_OF_PAGE (PAGE_SIZE - sizeof(lsn_t) - sizeof(int))
 
+#define UNINITIALIZED_RECORD 0
+#define BLOB_RECORD          1
+#define SLOTTED_RECORD       2
+#define FIXED_RECORD         3
+
+
+
 /*#define invalidateSlot(page, n) (*slot_ptr((page), (n)) =  INVALID_SLOT)*/
 
 /** 
@@ -273,6 +280,9 @@ void  pageRealloc(Page * p, int id);
 */
 /*int pageAlloc() ;*/
 
+int getRecordType(int xid, Page * p, recordid rid);
+int getRecordTypeUnlocked(int xid, Page * p, recordid rid);
+
 END_C_DECLS
 
 #endif

src/lladd/page/fixed.h

@@ -8,6 +8,7 @@
 #define fixed_record_ptr(page, n)   bytes_from_start((page), *recordsize_ptr((page)) * (n))
 int recordsPerPage(size_t size);
 void fixedPageInitialize(Page * page, size_t size, int count);
+/** Return the number of records in a fixed length page */
 short fixedPageCount(Page * page);
 short fixedPageRecordSize(Page * page);
 recordid fixedRawRallocMany(Page * page, int count);