Add a changeset cache to stop us looking up the same changeset over

[rails.git] / app / models / changeset.rb

diff --git a/app/models/changeset.rb b/app/models/changeset.rb
index 3e0ba9f8ef1d5c48efaf60eea3ebe118190d08b8..fa2d556b10c00195a20d5f8670224a22475ebb7b 100644 (file)
--- a/app/models/changeset.rb
+++ b/app/models/changeset.rb
@@ -27,15 +27,11 @@ class Changeset < ActiveRecord::Base
   # maximum number of elements allowed in a changeset
   MAX_ELEMENTS = 50000
 
-  # maximum time a changeset is allowed to be open for (note that this
-  # is in days - so one hour is Rational(1,24)).
-  MAX_TIME_OPEN = 1
+  # maximum time a changeset is allowed to be open for.
+  MAX_TIME_OPEN = 1.day
 
-  # idle timeout increment, one hour as a rational number of days.
-  # NOTE: DO NOT CHANGE THIS TO 1.hour! when this was done the idle
-  # timeout changed to 1 second, which meant all changesets closed 
-  # almost immediately.
-  IDLE_TIMEOUT = Rational(1,24)
+  # idle timeout increment, one hour seems reasonable.
+  IDLE_TIMEOUT = 1.hour
 
   # Use a method like this, so that we can easily change how we
   # determine whether a changeset is open, without breaking code in at 
@@ -46,29 +42,28 @@ class Changeset < ActiveRecord::Base
     # note that this may not be a hard limit - due to timing changes and
     # concurrency it is possible that some changesets may be slightly 
     # longer than strictly allowed or have slightly more changes in them.
-    return ((closed_at > DateTime.now) and (num_changes <= MAX_ELEMENTS))
+    return ((closed_at > Time.now.getutc) and (num_changes <= MAX_ELEMENTS))
   end
 
   def set_closed_time_now
-    unless is_open?
-      self.closed_at = DateTime.now
+    if is_open?
+      self.closed_at = Time.now.getutc
     end
   end
   
   def self.from_xml(xml, create=false)
     begin
-      p = XML::Parser.new
-      p.string = xml
+      p = XML::Parser.string(xml)
       doc = p.parse
 
       cs = Changeset.new
 
       doc.find('//osm/changeset').each do |pt|
         if create
-          cs.created_at = Time.now
+          cs.created_at = Time.now.getutc
           # initial close time is 1h ahead, but will be increased on each
           # modification.
-          cs.closed_at = Time.now + IDLE_TIMEOUT
+          cs.closed_at = cs.created_at + IDLE_TIMEOUT
           # initially we have no changes in a changeset
           cs.num_changes = 0
         end
@@ -90,6 +85,10 @@ class Changeset < ActiveRecord::Base
   def bbox
     @bbox ||= [ min_lon, min_lat, max_lon, max_lat ]
   end
+  
+  def has_valid_bbox?
+    not bbox.include? nil
+  end
 
   ##
   # expand the bounding box to include the given bounding box. also, 
@@ -145,7 +144,7 @@ class Changeset < ActiveRecord::Base
   end
 
   def save_with_tags!
-    t = Time.now
+    t = Time.now.getutc
 
     # do the changeset update and the changeset tags update in the
     # same transaction to ensure consistency.
@@ -156,7 +155,7 @@ class Changeset < ActiveRecord::Base
       if (closed_at - created_at) > (MAX_TIME_OPEN - IDLE_TIMEOUT)
         self.closed_at = created_at + MAX_TIME_OPEN
       else
-        self.closed_at = DateTime.now + IDLE_TIMEOUT
+        self.closed_at = Time.now.getutc + IDLE_TIMEOUT
       end
       self.save!
 
@@ -226,7 +225,7 @@ class Changeset < ActiveRecord::Base
   def update_from(other, user)
     # ensure that only the user who opened the changeset may modify it.
     unless user.id == self.user_id 
-      raise OSM::APIUserChangesetMismatchError 
+      raise OSM::APIUserChangesetMismatchError.new
     end
     
     # can't change a closed changeset