[mesos] 03/04: Made RoleTree class default constructable.

[mzhu]

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mzhu pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/mesos.git

commit f4db86c525affd8b875b6ddb8f1a608eee830ce6
Author: Meng Zhu <m...@mesosphere.io>
AuthorDate: Mon Aug 19 13:57:07 2019 -0700

    Made RoleTree class default constructable.
    
    This makes the metric handler optional. This is mainly for
    unit testing purpose.
    
    Review: https://reviews.apache.org/r/71312
---
 src/master/allocator/mesos/hierarchical.cpp | 14 ++++++++++++--
 src/master/allocator/mesos/hierarchical.hpp |  4 +++-
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/src/master/allocator/mesos/hierarchical.cpp 
b/src/master/allocator/mesos/hierarchical.cpp
index 852d426..b8b9241 100644
--- a/src/master/allocator/mesos/hierarchical.cpp
+++ b/src/master/allocator/mesos/hierarchical.cpp
@@ -224,6 +224,9 @@ void Role::removeChild(Role* child)
 }
 
 
+RoleTree::RoleTree() : root_(new Role("", nullptr)) {}
+
+
 RoleTree::RoleTree(Metrics* metrics_)
   : root_(new Role("", nullptr)), metrics(metrics_) {}
 
@@ -268,7 +271,10 @@ Role& RoleTree::operator[](const std::string& rolePath)
       current == root_ ? token : strings::join("/", current->role, token);
     CHECK_NOT_CONTAINS(roles_, newRolePath);
     roles_.put(newRolePath, Role(newRolePath, current));
-    metrics->addRole(newRolePath);
+
+    if (metrics.isSome()) {
+      (*metrics)->addRole(newRolePath);
+    }
 
     Role& role = roles_.at(newRolePath);
     current->addChild(&role);
@@ -300,7 +306,11 @@ bool RoleTree::tryRemove(const std::string& role)
     Role* parent = CHECK_NOTNULL(current->parent);
 
     parent->removeChild(current);
-    metrics->removeRole(current->role);
+
+    if (metrics.isSome()) {
+      (*metrics)->removeRole(current->role);
+    }
+
     roles_.erase(current->role);
 
     current = parent;
diff --git a/src/master/allocator/mesos/hierarchical.hpp 
b/src/master/allocator/mesos/hierarchical.hpp
index db26a2a..035fd3d 100644
--- a/src/master/allocator/mesos/hierarchical.hpp
+++ b/src/master/allocator/mesos/hierarchical.hpp
@@ -188,6 +188,8 @@ private:
 class RoleTree
 {
 public:
+  RoleTree(); // Only used in tests.
+
   RoleTree(Metrics* metrics);
 
   ~RoleTree();
@@ -234,7 +236,7 @@ private:
   Role* root_;
 
   // Allocator's metrics handle for publishing role related metrics.
-  Metrics* metrics;
+  Option<Metrics*> metrics;
 
   // A map of role and `Role` pairs for quick lookup.
   hashmap<std::string, Role> roles_;