Add ReceivedPackStatistics for PackParser

This is like PackStatistics, but for PackParser.

Change-Id: I854215c0956fd0b36843d631780be303e021b8be
Signed-off-by: Masaya Suzuki <masayasuzuki@google.com>

org.eclipse.jgit/src/org/eclipse/jgit/transport/BaseReceivePack.java

@@ -69,6 +69,7 @@ import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.TimeUnit;
 
+import org.eclipse.jgit.annotations.Nullable;
 import org.eclipse.jgit.errors.InvalidObjectIdException;
 import org.eclipse.jgit.errors.MissingObjectException;
 import org.eclipse.jgit.errors.PackProtocolException;
@@ -268,6 +269,7 @@ public abstract class BaseReceivePack {
 	private PushCertificateParser pushCertificateParser;
 	private SignedPushConfig signedPushConfig;
 	private PushCertificate pushCert;
+	private ReceivedPackStatistics stats;
 
 	/**
 	 * Get the push certificate used to verify the pusher's identity.
@@ -1114,6 +1116,18 @@ public abstract class BaseReceivePack {
 		adv.end();
 	}
 
+	/**
+	 * Returns the statistics on the received pack if available. This should be
+	 * called after {@link #receivePack} is called.
+	 *
+	 * @return ReceivedPackStatistics
+	 * @since 4.5
+	 */
+	@Nullable
+	public ReceivedPackStatistics getReceivedPackStatistics() {
+		return stats;
+	}
+
 	/**
 	 * Receive a list of commands from the input.
 	 *
@@ -1307,6 +1321,7 @@ public abstract class BaseReceivePack {
 			parser.setMaxObjectSizeLimit(maxObjectSizeLimit);
 			packLock = parser.parse(receiving, resolving);
 			packSize = Long.valueOf(parser.getPackSize());
+			stats = parser.getReceivedPackStatistics();
 			ins.flush();
 		}
 

org.eclipse.jgit/src/org/eclipse/jgit/transport/PackParser.java

@@ -186,6 +186,9 @@ public abstract class PackParser {
 	/** Git object size limit */
 	private long maxObjectSizeLimit;
 
+	private final ReceivedPackStatistics.Builder stats =
+			new ReceivedPackStatistics.Builder();
+
 	/**
 	 * Initialize a pack parser.
 	 *
@@ -455,8 +458,8 @@ public abstract class PackParser {
 	}
 
 	/**
-	 * Get the size of the parsed pack.
+	 * Get the size of the newly created pack.
-	 *
+	 * <p>
 	 * This will also include the pack index size if an index was created. This
 	 * method should only be called after pack parsing is finished.
 	 *
@@ -468,6 +471,18 @@ public abstract class PackParser {
 		return -1;
 	}
 
+	/**
+	 * Returns the statistics of the parsed pack.
+	 * <p>
+	 * This should only be called after pack parsing is finished.
+	 *
+	 * @return {@link ReceivedPackStatistics}
+	 * @since 4.5
+	 */
+	public ReceivedPackStatistics getReceivedPackStatistics() {
+		return stats.build();
+	}
+
 	/**
 	 * Parse the pack stream.
 	 *
@@ -626,6 +641,7 @@ public abstract class PackParser {
 	private void resolveDeltas(DeltaVisit visit, final int type,
 			ObjectTypeAndSize info, ProgressMonitor progress)
 			throws IOException {
+		stats.addDeltaObject(type);
 		do {
 			progress.update(1);
 			info = openDatabase(visit.delta, info);
@@ -919,6 +935,7 @@ public abstract class PackParser {
 
 	// Cleanup all resources associated with our input parsing.
 	private void endInput() {
+		stats.setNumBytesRead(streamPosition());
 		in = null;
 	}
 
@@ -947,12 +964,14 @@ public abstract class PackParser {
 		case Constants.OBJ_TREE:
 		case Constants.OBJ_BLOB:
 		case Constants.OBJ_TAG:
+			stats.addWholeObject(typeCode);
 			onBeginWholeObject(streamPosition, typeCode, sz);
 			onObjectHeader(Source.INPUT, hdrBuf, 0, hdrPtr);
 			whole(streamPosition, typeCode, sz);
 			break;
 
 		case Constants.OBJ_OFS_DELTA: {
+			stats.addOffsetDelta();
 			c = readFrom(Source.INPUT);
 			hdrBuf[hdrPtr++] = (byte) c;
 			long ofs = c & 127;
@@ -975,6 +994,7 @@ public abstract class PackParser {
 		}
 
 		case Constants.OBJ_REF_DELTA: {
+			stats.addRefDelta();
 			c = fill(Source.INPUT, 20);
 			final ObjectId base = ObjectId.fromRaw(buf, c);
 			System.arraycopy(buf, c, hdrBuf, hdrPtr, 20);

org.eclipse.jgit/src/org/eclipse/jgit/transport/ReceivedPackStatistics.java

@@ -0,0 +1,231 @@
+/*
+ * Copyright (C) 2016, Google Inc.
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.eclipse.jgit.transport;
+
+import org.eclipse.jgit.lib.Constants;
+
+/**
+ * Statistics about {@link PackParser}.
+ *
+ * @since 4.5
+ */
+public class ReceivedPackStatistics {
+	private long numBytesRead;
+
+	private long numWholeCommit;
+	private long numWholeTree;
+	private long numWholeBlob;
+	private long numWholeTag;
+	private long numOfsDelta;
+	private long numRefDelta;
+
+	private long numDeltaCommit;
+	private long numDeltaTree;
+	private long numDeltaBlob;
+	private long numDeltaTag;
+
+	/** @return number of bytes read from the input stream */
+	public long getNumBytesRead() {
+		return numBytesRead;
+	}
+
+	/** @return number of whole commit objects in the pack */
+	public long getNumWholeCommit() {
+		return numWholeCommit;
+	}
+
+	/** @return number of whole tree objects in the pack */
+	public long getNumWholeTree() {
+		return numWholeTree;
+	}
+
+	/** @return number of whole blob objects in the pack */
+	public long getNumWholeBlob() {
+		return numWholeBlob;
+	}
+
+	/** @return number of whole tag objects in the pack */
+	public long getNumWholeTag() {
+		return numWholeTag;
+	}
+
+	/** @return number of offset delta objects in the pack */
+	public long getNumOfsDelta() {
+		return numOfsDelta;
+	}
+
+	/** @return number of ref delta objects in the pack */
+	public long getNumRefDelta() {
+		return numRefDelta;
+	}
+
+	/** @return number of delta commit objects in the pack */
+	public long getNumDeltaCommit() {
+		return numDeltaCommit;
+	}
+
+	/** @return number of delta tree objects in the pack */
+	public long getNumDeltaTree() {
+		return numDeltaTree;
+	}
+
+	/** @return number of delta blob objects in the pack */
+	public long getNumDeltaBlob() {
+		return numDeltaBlob;
+	}
+
+	/** @return number of delta tag objects in the pack */
+	public long getNumDeltaTag() {
+		return numDeltaTag;
+	}
+
+	/** A builder for {@link ReceivedPackStatistics}. */
+	public static class Builder {
+		private long numBytesRead;
+
+		private long numWholeCommit;
+		private long numWholeTree;
+		private long numWholeBlob;
+		private long numWholeTag;
+		private long numOfsDelta;
+		private long numRefDelta;
+
+		private long numDeltaCommit;
+		private long numDeltaTree;
+		private long numDeltaBlob;
+		private long numDeltaTag;
+
+		/**
+		 * @param numBytesRead number of bytes read from the input stream
+		 * @return this
+		 */
+		public Builder setNumBytesRead(long numBytesRead) {
+			this.numBytesRead = numBytesRead;
+			return this;
+		}
+
+		/**
+		 * Increment a whole object count.
+		 *
+		 * @param type OBJ_COMMIT, OBJ_TREE, OBJ_BLOB, or OBJ_TAG
+		 * @return this
+		 */
+		public Builder addWholeObject(int type) {
+			switch (type) {
+				case Constants.OBJ_COMMIT:
+					numWholeCommit++;
+					break;
+				case Constants.OBJ_TREE:
+					numWholeTree++;
+					break;
+				case Constants.OBJ_BLOB:
+					numWholeBlob++;
+					break;
+				case Constants.OBJ_TAG:
+					numWholeTag++;
+					break;
+				default:
+					throw new IllegalArgumentException(
+							type + " cannot be a whole object"); //$NON-NLS-1$
+			}
+			return this;
+		}
+
+		/** @return this */
+		public Builder addOffsetDelta() {
+			numOfsDelta++;
+			return this;
+		}
+
+		/** @return this */
+		public Builder addRefDelta() {
+			numRefDelta++;
+			return this;
+		}
+
+		/**
+		 * Increment a delta object count.
+		 *
+		 * @param type OBJ_COMMIT, OBJ_TREE, OBJ_BLOB, or OBJ_TAG
+		 * @return this
+		 */
+		public Builder addDeltaObject(int type) {
+			switch (type) {
+				case Constants.OBJ_COMMIT:
+					numDeltaCommit++;
+					break;
+				case Constants.OBJ_TREE:
+					numDeltaTree++;
+					break;
+				case Constants.OBJ_BLOB:
+					numDeltaBlob++;
+					break;
+				case Constants.OBJ_TAG:
+					numDeltaTag++;
+					break;
+				default:
+					throw new IllegalArgumentException(
+							"delta should be a delta to a whole object. " + //$NON-NLS-1$
+							type + " cannot be a whole object"); //$NON-NLS-1$
+			}
+			return this;
+		}
+
+		ReceivedPackStatistics build() {
+			ReceivedPackStatistics s = new ReceivedPackStatistics();
+			s.numBytesRead = numBytesRead;
+			s.numWholeCommit = numWholeCommit;
+			s.numWholeTree = numWholeTree;
+			s.numWholeBlob = numWholeBlob;
+			s.numWholeTag = numWholeTag;
+			s.numOfsDelta = numOfsDelta;
+			s.numRefDelta = numRefDelta;
+			s.numDeltaCommit = numDeltaCommit;
+			s.numDeltaTree = numDeltaTree;
+			s.numDeltaBlob = numDeltaBlob;
+			s.numDeltaTag = numDeltaTag;
+			return s;
+		}
+	}
+}