move TimeStampDeltaDecoder to BSFile

Now the encoding and decoding code is in the same class.

block-storage/src/test/java/org/lucares/pdb/blockstorage/BSFileTest.java

@@ -8,6 +8,7 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
+import java.util.Random;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
@@ -131,4 +132,58 @@ public class BSFileTest {
 		}
 	}
 
+	public void testBlockStorageTimeValue() throws Exception {
+		final Path file = dataDirectory.resolve("data.int.db");
+		final Random random = ThreadLocalRandom.current();
+		final int numTimeValuePairs = 1000;
+		long blockNumber = -1;
+		final LongList expectedLongs = new LongList();
+
+		long start = System.nanoTime();
+		long lastEpochMilli = 0;
+		//
+		try (final DiskStorage ds = new DiskStorage(file)) {
+
+			try (final BSFile bsFile = BSFile.newFile(ds)) {
+
+				blockNumber = bsFile.getRootBlockNumber();
+
+				for (long i = 0; i < numTimeValuePairs / 2; i++) {
+
+					final long epochMilli = lastEpochMilli + random.nextInt(1000);
+					final long value = random.nextInt(10000);
+
+					lastEpochMilli = epochMilli;
+
+					bsFile.appendTimeValue(epochMilli, value);
+					expectedLongs.add(epochMilli);
+					expectedLongs.add(value);
+				}
+			}
+			try (final BSFile bsFile = BSFile.existingFile(blockNumber, ds)) {
+
+				for (long i = numTimeValuePairs / 2; i < numTimeValuePairs; i++) {
+					final long epochMilli = lastEpochMilli + random.nextInt(100);
+					final long value = random.nextInt(10000);
+
+					lastEpochMilli = epochMilli;
+
+					bsFile.appendTimeValue(epochMilli, value);
+					expectedLongs.add(epochMilli);
+					expectedLongs.add(value);
+				}
+			}
+		}
+		System.out.println("duration write: " + (System.nanoTime() - start) / 1_000_000.0 + "ms");
+
+		start = System.nanoTime();
+		try (final DiskStorage ds = new DiskStorage(file)) {
+			final BSFile bsFile = BSFile.existingFile(blockNumber, ds);
+			final LongList actualLongs = bsFile.asTimeValueLongList();
+
+			Assert.assertEquals(actualLongs, expectedLongs);
+		}
+		System.out.println("duration read: " + (System.nanoTime() - start) / 1_000_000.0 + "ms");
+	}
+
 }