Method deleteTuple

test/simpledb/BufferPoolWriteTest.java:94–124

Unit test for BufferPool.deleteTuple()

()

     * Unit test for BufferPool.deleteTuple()
     */
    @Test public void deleteTuple() throws Exception {

    	// heap file should have ~10 pages
    	HeapFile hf = SystemTestUtil.createRandomHeapFile(2, 504*10, null, null);
    	DbFileIterator it = hf.iterator(tid);
    	it.open();
    	
    	List<Tuple> tuples = new ArrayList<>();
    	while(it.hasNext()) {
    		tuples.add(it.next());
    	}
    	
    	// clear the cache
    	Database.resetBufferPool(BufferPool.DEFAULT_PAGES);
        
    	// delete 504 tuples from the first page
    	for (int i = 0; i < 504; ++i) {
    		Tuple t = tuples.get(i);
        	Database.getBufferPool().deleteTuple(tid, t);
        	HeapPage p = (HeapPage) Database.getBufferPool().getPage(tid, t.getRecordId().getPageId(), Permissions.READ_ONLY);
        	assertEquals(i+1, p.getNumEmptySlots());
        }
    	
    	// delete 504 tuples from the second page
    	for (int i = 0; i < 504; ++i) {
    		Tuple t = tuples.get(i+504);
        	Database.getBufferPool().deleteTuple(tid, t);
        	HeapPage p = (HeapPage) Database.getBufferPool().getPage(tid, t.getRecordId().getPageId(), Permissions.READ_ONLY);
        	assertEquals(i+1, p.getNumEmptySlots());
        }
    }
    
    @Test public void handleManyDirtyPages() throws Exception {
    	HeapFileDuplicates hfd = new HeapFileDuplicates(empty.getFile(), empty.getTupleDesc(), 10);