[6.0 API cleanup] Public interface for PackLock

Provide a public interface PackLock exposing only the unlock() method.
Rename the internal PackLock class to PackLockImpl and have it implement
the new interface.

This way PackParser doesn't expose an internal class via its API
anymore, and client can still unlock pack locks that were created.

Bug: 576340
Change-Id: I976739f4ab28fe1f9ba7f35653a69a913aa68841
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>

11 files changed, 40 insertions, 19 deletions

diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackParser.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackParser.java
index 29d11104d4..d8e191c4e0 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackParser.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackParser.java
@@ -23,10 +23,10 @@ import java.util.zip.CRC32;
 import java.util.zip.Deflater;
 
 import org.eclipse.jgit.internal.storage.file.PackIndex;
-import org.eclipse.jgit.internal.storage.file.PackLock;
 import org.eclipse.jgit.lib.AnyObjectId;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.ProgressMonitor;
+import org.eclipse.jgit.transport.PackLock;
 import org.eclipse.jgit.transport.PackParser;
 import org.eclipse.jgit.transport.PackedObjectInfo;
 
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/ObjectDirectoryPackParser.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/ObjectDirectoryPackParser.java
index dba8ccd99b..1c23ff20c7 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/ObjectDirectoryPackParser.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/ObjectDirectoryPackParser.java
@@ -34,6 +34,7 @@ import org.eclipse.jgit.lib.CoreConfig;
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.ProgressMonitor;
 import org.eclipse.jgit.storage.pack.PackConfig;
+import org.eclipse.jgit.transport.PackLock;
 import org.eclipse.jgit.transport.PackParser;
 import org.eclipse.jgit.transport.PackedObjectInfo;
 import org.eclipse.jgit.util.FileUtils;
@@ -431,7 +432,7 @@ public class ObjectDirectoryPackParser extends PackParser {
 		File packDir = new File(db.getDirectory(), "pack"); //$NON-NLS-1$
 		PackFile finalPack = new PackFile(packDir, id, PackExt.PACK);
 		PackFile finalIdx = finalPack.create(PackExt.INDEX);
-		final PackLock keep = new PackLock(finalPack, db.getFS());
+		final PackLockImpl keep = new PackLockImpl(finalPack, db.getFS());
 
 		if (!packDir.exists() && !packDir.mkdir() && !packDir.exists()) {
 			// The objects/pack directory isn't present, and we are unable
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackLock.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackLockImpl.java
index 482b143e33..7cc5f50549 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackLock.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackLockImpl.java
@@ -14,6 +14,7 @@ import java.io.File;
 import java.io.IOException;
 
 import org.eclipse.jgit.lib.Constants;
+import org.eclipse.jgit.transport.PackLock;
 import org.eclipse.jgit.util.FS;
 import org.eclipse.jgit.util.FileUtils;
 
@@ -21,7 +22,7 @@ import org.eclipse.jgit.util.FileUtils;
  * Keeps track of a {@link org.eclipse.jgit.internal.storage.file.Pack}'s
  * associated <code>.keep</code> file.
  */
-public class PackLock {
+public class PackLockImpl implements PackLock {
 	private final File keepFile;
 
 	/**
@@ -32,7 +33,7 @@ public class PackLock {
 	 * @param fs
 	 *            the filesystem abstraction used by the repository.
 	 */
-	public PackLock(File packFile, FS fs) {
+	public PackLockImpl(File packFile, FS fs) {
 		final File p = packFile.getParentFile();
 		final String n = packFile.getName();
 		keepFile = new File(p, n.substring(0, n.length() - 5) + ".keep"); //$NON-NLS-1$
@@ -59,12 +60,7 @@ public class PackLock {
 		return lf.commit();
 	}
 
-	/**
-	 * Remove the <code>.keep</code> file that holds this pack in place.
-	 *
-	 * @throws java.io.IOException
-	 *             if deletion of .keep file failed
-	 */
+	@Override
 	public void unlock() throws IOException {
 		FileUtils.delete(keepFile);
 	}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/BasePackFetchConnection.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/BasePackFetchConnection.java
index d344deac26..f48e1e68cc 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/BasePackFetchConnection.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/BasePackFetchConnection.java
@@ -28,7 +28,6 @@ import org.eclipse.jgit.errors.PackProtocolException;
 import org.eclipse.jgit.errors.RemoteRepositoryException;
 import org.eclipse.jgit.errors.TransportException;
 import org.eclipse.jgit.internal.JGitText;
-import org.eclipse.jgit.internal.storage.file.PackLock;
 import org.eclipse.jgit.lib.AnyObjectId;
 import org.eclipse.jgit.lib.Config;
 import org.eclipse.jgit.lib.MutableObjectId;
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/BundleFetchConnection.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/BundleFetchConnection.java
index 47d156b667..f04e573feb 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/BundleFetchConnection.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/BundleFetchConnection.java
@@ -35,7 +35,6 @@ import org.eclipse.jgit.errors.MissingObjectException;
 import org.eclipse.jgit.errors.PackProtocolException;
 import org.eclipse.jgit.errors.TransportException;
 import org.eclipse.jgit.internal.JGitText;
-import org.eclipse.jgit.internal.storage.file.PackLock;
 import org.eclipse.jgit.lib.NullProgressMonitor;
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.ObjectIdRef;
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/FetchConnection.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/FetchConnection.java
index d06ef65c76..9dc0620665 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/FetchConnection.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/FetchConnection.java
@@ -18,7 +18,6 @@ import java.util.Collection;
 import java.util.Set;
 
 import org.eclipse.jgit.errors.TransportException;
-import org.eclipse.jgit.internal.storage.file.PackLock;
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.ProgressMonitor;
 import org.eclipse.jgit.lib.Ref;
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/FetchProcess.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/FetchProcess.java
index 34bad6e029..7d7b3ee0a0 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/FetchProcess.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/FetchProcess.java
@@ -37,7 +37,6 @@ import org.eclipse.jgit.errors.NotSupportedException;
 import org.eclipse.jgit.errors.TransportException;
 import org.eclipse.jgit.internal.JGitText;
 import org.eclipse.jgit.internal.storage.file.LockFile;
-import org.eclipse.jgit.internal.storage.file.PackLock;
 import org.eclipse.jgit.lib.BatchRefUpdate;
 import org.eclipse.jgit.lib.BatchingProgressMonitor;
 import org.eclipse.jgit.lib.Constants;
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/PackLock.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/PackLock.java
new file mode 100644
index 0000000000..bf2140759f
--- /dev/null
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/PackLock.java
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2021 Thomas Wolf <thomas.wolf@paranor.ch> and others.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Distribution License v. 1.0 which is available at
+ * https://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+package org.eclipse.jgit.transport;
+
+import java.io.IOException;
+
+/**
+ * A {@code PackLock} describes a {@code .keep} file that holds a pack in place.
+ * If {@link PackParser#parse(org.eclipse.jgit.lib.ProgressMonitor)} creates
+ * such a pack lock, it returns the lock so that it can be unlocked once the
+ * pack doesn't need a {@code .keep} file anymore.
+ *
+ * @since 6.0
+ */
+public interface PackLock {
+
+	/**
+	 * Remove the {@code .keep} file that holds a pack in place.
+	 *
+	 * @throws java.io.IOException
+	 *             if deletion of the {@code .keep} file failed
+	 */
+	void unlock() throws IOException;
+}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/PackParser.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/PackParser.java
index 715cbb48fb..e43ea0261e 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/PackParser.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/PackParser.java
@@ -29,7 +29,6 @@ import org.eclipse.jgit.errors.CorruptObjectException;
 import org.eclipse.jgit.errors.MissingObjectException;
 import org.eclipse.jgit.errors.TooLargeObjectInPackException;
 import org.eclipse.jgit.internal.JGitText;
-import org.eclipse.jgit.internal.storage.file.PackLock;
 import org.eclipse.jgit.internal.storage.pack.BinaryDelta;
 import org.eclipse.jgit.lib.AnyObjectId;
 import org.eclipse.jgit.lib.BatchingProgressMonitor;
@@ -490,7 +489,7 @@ public abstract class PackParser {
 	 *         {@link #setLockMessage(String)}.
 	 * @throws java.io.IOException
 	 *             the stream is malformed, or contains corrupt objects.
-	 * @since 3.0
+	 * @since 6.0
 	 */
 	public final PackLock parse(ProgressMonitor progress) throws IOException {
 		return parse(progress, progress);
@@ -509,7 +508,7 @@ public abstract class PackParser {
 	 *         {@link #setLockMessage(String)}.
 	 * @throws java.io.IOException
 	 *             the stream is malformed, or contains corrupt objects.
-	 * @since 3.0
+	 * @since 6.0
 	 */
 	public PackLock parse(ProgressMonitor receiving, ProgressMonitor resolving)
 			throws IOException {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/ReceivePack.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/ReceivePack.java
index 58f8895e00..871ba50a6c 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/ReceivePack.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/ReceivePack.java
@@ -48,7 +48,6 @@ import org.eclipse.jgit.errors.PackProtocolException;
 import org.eclipse.jgit.errors.TooLargePackException;
 import org.eclipse.jgit.errors.UnpackException;
 import org.eclipse.jgit.internal.JGitText;
-import org.eclipse.jgit.internal.storage.file.PackLock;
 import org.eclipse.jgit.internal.submodule.SubmoduleValidator;
 import org.eclipse.jgit.internal.submodule.SubmoduleValidator.SubmoduleValidationException;
 import org.eclipse.jgit.internal.transport.connectivity.FullConnectivityChecker;
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/WalkFetchConnection.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/WalkFetchConnection.java
index a6b20451dd..d67fe074e4 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/WalkFetchConnection.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/WalkFetchConnection.java
@@ -32,7 +32,6 @@ import org.eclipse.jgit.errors.TransportException;
 import org.eclipse.jgit.internal.JGitText;
 import org.eclipse.jgit.internal.storage.file.ObjectDirectory;
 import org.eclipse.jgit.internal.storage.file.PackIndex;
-import org.eclipse.jgit.internal.storage.file.PackLock;
 import org.eclipse.jgit.internal.storage.file.UnpackedObject;
 import org.eclipse.jgit.lib.AnyObjectId;
 import org.eclipse.jgit.lib.Constants;