/**
* Tests the ability to store a <code>null</code> in a tuple of a {@link BTree}, to reload the
* {@link BTree} and find the <code>null</code> value still under the tuple, and to build an
* {@link IndexSegmentBuilder} from the {@link BTree} and find the <code>null</code> value under
* the tuple.
*
* @throws IOException
* @throws Exception
*/
public void test_nullValues() throws IOException, Exception {
final IRawStore store = new SimpleMemoryRawStore();
final IndexMetadata metadata = new IndexMetadata(UUID.randomUUID());
BTree btree = BTree.create(store, metadata);
final byte[] k1 = new byte[] {1};
assertNull(btree.lookup(k1));
assertFalse(btree.contains(k1));
assertNull(btree.insert(k1, null));
assertNull(btree.lookup(k1));
assertTrue(btree.contains(k1));
final long addrCheckpoint1 = btree.writeCheckpoint();
btree = BTree.load(store, addrCheckpoint1, true /*readOnly*/);
assertNull(btree.lookup(k1));
assertTrue(btree.contains(k1));
File outFile = null;
File tmpDir = null;
try {
outFile = new File(getName() + ".seg");
if (outFile.exists() && !outFile.delete()) {
throw new RuntimeException("Could not delete file: " + outFile);
}
tmpDir = outFile.getAbsoluteFile().getParentFile();
final long commitTime = System.currentTimeMillis();
@SuppressWarnings("unused")
final IndexSegmentCheckpoint checkpoint =
IndexSegmentBuilder.newInstance(
outFile,
tmpDir,
btree.getEntryCount(),
btree.rangeIterator(),
3 /* m */,
btree.getIndexMetadata(),
commitTime,
true /* compactingMerge */,
bufferNodes)
.call();
// @see BLZG-1501 (remove LRUNexus)
// if (LRUNexus.INSTANCE != null) {
//
// /*
// * Clear the records for the index segment from the cache so we will
// * read directly from the file. This is necessary to ensure that the
// * data on the file is good rather than just the data in the cache.
// */
//
// LRUNexus.INSTANCE.deleteCache(checkpoint.segmentUUID);
//
// }
/*
* Verify can load the index file and that the metadata associated
* with the index file is correct (we are only checking those
* aspects that are easily defined by the test case and not, for
* example, those aspects that depend on the specifics of the length
* of serialized nodes or leaves).
*/
final IndexSegmentStore segStore = new IndexSegmentStore(outFile);
final IndexSegment seg = segStore.loadIndexSegment();
try {
assertNull(seg.lookup(k1));
assertTrue(seg.contains(k1));
} finally {
seg.close();
}
} finally {
if (outFile != null && outFile.exists() && !outFile.delete()) {
log.warn("Could not delete file: " + outFile);
}
}
}
