DfsReaderIoStats: Add Commit Graph fields into DfsReaderIoStats

We are adding commit-graph loading to the DFS stack and the stats object doesn't have fields to track that.

This change replicates the stats of the primary index for the commit-graph.

Signed-off-by: Xing Huang <xingkhuang@google.com>
Change-Id: I4a657bed50083c4ae8bc9f059d4943d612ea2d49

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsReaderIoStats.java

@@ -28,6 +28,9 @@ public static class Accumulator {
 		/** Total number of cache hits for bitmap indexes. */
 		long bitmapCacheHit;
 
+		/** Total number of cache hits for commit graphs. */
+		long commitGraphCacheHit;
+
 		/** Total number of complete pack indexes read into memory. */
 		long readIdx;
 
@@ -37,15 +40,24 @@ public static class Accumulator {
 		/** Total number of reverse indexes added into memory. */
 		long readReverseIdx;
 
+		/** Total number of complete commit graphs read into memory. */
+		long readCommitGraph;
+
 		/** Total number of bytes read from pack indexes. */
 		long readIdxBytes;
 
+		/** Total number of bytes read from commit graphs. */
+		long readCommitGraphBytes;
+
 		/** Total microseconds spent reading pack indexes. */
 		long readIdxMicros;
 
 		/** Total microseconds spent creating reverse indexes. */
 		long readReverseIdxMicros;
 
+		/** Total microseconds spent creating commit graphs. */
+		long readCommitGraphMicros;
+
 		/** Total number of bytes read from bitmap indexes. */
 		long readBitmapIdxBytes;
 
@@ -122,6 +134,15 @@ public long getBitmapIndexCacheHits() {
 		return stats.bitmapCacheHit;
 	}
 
+	/**
+	 * Get total number of commit graph cache hits.
+	 *
+	 * @return total number of commit graph cache hits.
+	 */
+	public long getCommitGraphCacheHits() {
+		return stats.commitGraphCacheHit;
+	}
+
 	/**
 	 * Get total number of complete pack indexes read into memory.
 	 *
@@ -140,6 +161,15 @@ public long getReadReverseIndexCount() {
 		return stats.readReverseIdx;
 	}
 
+	/**
+	 * Get total number of times the commit graph read into memory.
+	 *
+	 * @return total number of commit graph read into memory.
+	 */
+	public long getReadCommitGraphCount() {
+		return stats.readCommitGraph;
+	}
+
 	/**
 	 * Get total number of complete bitmap indexes read into memory.
 	 *
@@ -158,6 +188,15 @@ public long getReadIndexBytes() {
 		return stats.readIdxBytes;
 	}
 
+	/**
+	 * Get total number of bytes read from commit graphs.
+	 *
+	 * @return total number of bytes read from commit graphs.
+	 */
+	public long getCommitGraphBytes() {
+		return stats.readCommitGraphBytes;
+	}
+
 	/**
 	 * Get total microseconds spent reading pack indexes.
 	 *
@@ -176,6 +215,15 @@ public long getReadReverseIndexMicros() {
 		return stats.readReverseIdxMicros;
 	}
 
+	/**
+	 * Get total microseconds spent reading commit graphs.
+	 *
+	 * @return total microseconds spent reading commit graphs.
+	 */
+	public long getReadCommitGraphMicros() {
+		return stats.readCommitGraphMicros;
+	}
+
 	/**
 	 * Get total number of bytes read from bitmap indexes.
 	 *