Introduce PostUploadHook to replace UploadPackLogger

UploadPackLogger is incorrectly named--it can be used to trigger any
post upload action, such as GC/compaction. This change introduces
PostUploadHook/PostUploadHookChain to replace
UploadPackLogger/UploadPackLoggerChain and deprecates the latter.

It also introduces PackStatistics as a replacement for
PackWriter.Statistics, since the latter is not public API.
It changes PackWriter to use PackStatistics and reimplements
PackWriter.Statistics to delegate to PackStatistics.

Change-Id: Ic51df1613e471f568ffee25ae67e118425b38986
Signed-off-by: Terry Parker <tparker@google.com>

1 files changed, 90 insertions, 0 deletions

diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/PostUploadHookChain.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/PostUploadHookChain.java
new file mode 100644
index 0000000000..4e2eaeaff1
--- /dev/null
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/PostUploadHookChain.java
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2015, Google Inc.
+ *
+ * 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 java.util.List;
+
+import org.eclipse.jgit.storage.pack.PackStatistics;
+
+/**
+ * {@link PostUploadHook} that delegates to a list of other hooks.
+ * <p>
+ * Hooks are run in the order passed to the constructor.
+ *
+ * @since 4.1
+ */
+public class PostUploadHookChain implements PostUploadHook {
+	private final PostUploadHook[] hooks;
+	private final int count;
+
+	/**
+	 * Create a new hook chaining the given hooks together.
+	 *
+	 * @param hooks
+	 *            hooks to execute, in order.
+	 * @return a new chain of the given hooks.
+	 */
+	public static PostUploadHook newChain(List<? extends PostUploadHook> hooks) {
+		PostUploadHook[] newHooks = new PostUploadHook[hooks.size()];
+		int i = 0;
+		for (PostUploadHook hook : hooks)
+			if (hook != PostUploadHook.NULL)
+				newHooks[i++] = hook;
+		if (i == 0)
+			return PostUploadHook.NULL;
+		else if (i == 1)
+			return newHooks[0];
+		else
+			return new PostUploadHookChain(newHooks, i);
+	}
+
+	public void onPostUpload(PackStatistics stats) {
+		for (int i = 0; i < count; i++)
+			hooks[i].onPostUpload(stats);
+	}
+
+	private PostUploadHookChain(PostUploadHook[] hooks, int count) {
+		this.hooks = hooks;
+		this.count = count;
+	}
+}