Audit hooks on JSON/RPC and SSH commands using Gerrit plugins.

New @Audit annotation to enable invocation of
AuditService injected on GerritGlobalModule.

Annotation applies to JSON/RPC interfaces whilst
on the SSH side audit is "hooked" directly into
SshLog class.

Enables the integration of Audit plugins through
the implementation of audit-listeners.
Dynamic loading and unloading of audit plugins is supported
through the @Extension/@Listener association and
automatically loaded and unloaded using Plugin
module self-registration.

In order to implement a new AuditListener implementation
you only to:

1) Define an implementation of AuditListener and annotate
as:

@Listener
public class MyAuditTrail extends AuditListener

2) Define a Plugin Module to bind your Audit implementation
in the configure() method as:

DynamicSet.bind(binder(), AuditListener.class)
  .to(MyAuditTrail.class);

Change-Id: Iaa26c4687a4ef4cbe27fe8396a5e0b8f6627536f
Signed-off-by: Luca Milanesio <luca.milanesio@gmail.com>

gerrit-server/src/main/java/com/google/gerrit/audit/AuditModule.java

@@ -0,0 +1,28 @@
+// Copyright (C) 2012 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.audit;
+
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.inject.AbstractModule;
+
+public class AuditModule extends AbstractModule {
+
+  @Override
+  protected void configure() {
+    DynamicSet.setOf(binder(), AuditListener.class);
+    bind(AuditService.class);
+  }
+
+}