Remove mutable container tracking

Resolves #58

Author: grantland

Parse/src/main/java/com/parse/ParseJSONCacheItem.java

@@ -21,7 +21,6 @@
 import java.util.Date;
 import java.util.HashMap;
 import java.util.HashSet;
-import java.util.IdentityHashMap;
 import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.List;
@@ -307,7 +306,6 @@ public String toString() {
   // Cached State
   private final Map<String, Object> estimatedData;
   private final Map<String, Boolean> dataAvailability;
-  private final Map<Object, ParseJSONCacheItem> hashedObjects; // For mutable containers
 
   private String localId;
   private final ParseMulticastDelegate<ParseObject> saveEvent = new ParseMulticastDelegate<>();
@@ -384,7 +382,6 @@ public ParseObject(String theClassName) {
     operationSetQueue = new LinkedList<>();
     operationSetQueue.add(new ParseOperationSet());
     estimatedData = new HashMap<>();
-    hashedObjects = new IdentityHashMap<>();
     dataAvailability = new HashMap<>();
 
     State.Init<?> builder = newStateBuilder(theClassName);
@@ -617,16 +614,6 @@ public Void then(Task<Void> task) throws Exception {
     }
   }
 
-  private void addToHashedObjects(Object object) {
-    synchronized (mutex) {
-      try {
-        hashedObjects.put(object, new ParseJSONCacheItem(object));
-      } catch (JSONException e) {
-        throw new IllegalArgumentException("Couldn't serialize container value to JSON.");
-      }
-    }
-  }
-
   /**
    * Converts a {@code ParseObject.State} to a {@code ParseObject}.
    *
@@ -755,7 +742,6 @@ private void setState(State newState, boolean notifyIfObjectIdChanges) {
 
       rebuildEstimatedData();
       rebuildDataAvailability();
-      checkpointAllMutableContainers();
     }
   }
 
@@ -844,7 +830,6 @@ public Set<String> keySet() {
       currentOperations().remove(key);
       rebuildEstimatedData();
       rebuildDataAvailability();
-      checkpointAllMutableContainers();
     }
   }
 
@@ -857,7 +842,6 @@ public Set<String> keySet() {
       currentOperations().clear();
       rebuildEstimatedData();
       rebuildDataAvailability();
-      checkpointAllMutableContainers();
     }
   }
 
@@ -1031,8 +1015,6 @@ protected boolean visit(Object object) {
 
   /* package */ JSONObject toRest(
       State state, List<ParseOperationSet> operationSetQueue, ParseEncoder objectEncoder) {
-      checkForChangesToMutableContainers();
-
       // Public data goes in dataJSON; special fields go in objectJSON.
       JSONObject json = new JSONObject();
 
@@ -1182,7 +1164,6 @@ public boolean isDirty() {
 
   /* package */ boolean isDirty(boolean considerChildren) {
     synchronized (mutex) {
-      checkForChangesToMutableContainers();
       return (isDeleted || getObjectId() == null || hasChanges() || (considerChildren && hasDirtyChildren()));
     }
   }
@@ -1217,80 +1198,6 @@ public boolean isDirty(String key) {
     }
   }
 
-  //region Mutable Containers
-
-  /* package */ boolean isContainerObject(String key, Object object) {
-    return (object instanceof JSONObject || object instanceof JSONArray
-        || object instanceof Map || object instanceof List
-        || object instanceof ParseACL || object instanceof ParseGeoPoint);
-  }
-
-  /**
-   * Updates the JSON cache value for all of the values in estimatedData.
-   */
-  private void checkpointAllMutableContainers() {
-    synchronized (mutex) {
-      for (Map.Entry<String, Object> entry : estimatedData.entrySet()) {
-        checkpointMutableContainer(entry.getKey(), entry.getValue());
-      }
-    }
-  }
-
-  /**
-   * Updates the JSON cache value for the given object.
-   */
-  private void checkpointMutableContainer(String key, Object object) {
-    synchronized (mutex) {
-      if (isContainerObject(key, object)) {
-        addToHashedObjects(object);
-      }
-    }
-  }
-
-  /**
-   * Inspects to see if a given mutable container owned by this object has been mutated, and treats
-   * any mutation as a new {@link #put(String, Object)} call.
-   */
-  private void checkForChangesToMutableContainer(String key, Object object) {
-    synchronized (mutex) {
-      if (isContainerObject(key, object)) {
-        ParseJSONCacheItem oldCacheItem = hashedObjects.get(object);
-        if (oldCacheItem == null) {
-          throw new IllegalArgumentException(
-              "ParseObject contains container item that isn't cached.");
-        } else {
-          ParseJSONCacheItem newCacheItem;
-          try {
-            newCacheItem = new ParseJSONCacheItem(object);
-          } catch (JSONException e) {
-            throw new RuntimeException(e);
-          }
-          if (!oldCacheItem.equals(newCacheItem)) {
-            // A mutable container changed out from under us. Treat it as a set operation.
-            performOperation(key, new ParseSetOperation(object));
-          }
-        }
-      } else {
-        hashedObjects.remove(object);
-      }
-    }
-  }
-
-  /**
-   * Inspects to see if any mutable container owned by this object has been mutated, and treats any
-   * mutation as a new {@link #put(String, Object)} call.
-   */
-  /* package */ void checkForChangesToMutableContainers() {
-    synchronized (mutex) {
-      for (String key : estimatedData.keySet()) {
-        checkForChangesToMutableContainer(key, estimatedData.get(key));
-      }
-      hashedObjects.keySet().retainAll(estimatedData.values());
-    }
-  }
-
-  //endregion
-
   /**
    * Accessor to the object id. An object id is assigned as soon as an object is saved to the
    * server. The combination of a className and an objectId uniquely identifies an object in your
@@ -2989,7 +2896,6 @@ private void rebuildDataAvailability() {
       ParseFieldOperation newOperation = operation.mergeWithPrevious(oldOperation);
       currentOperations().put(key, newOperation);
 
-      checkpointMutableContainer(key, newValue);
       dataAvailability.put(key, Boolean.TRUE);
     }
   }
@@ -3518,7 +3424,6 @@ private ParseACL getACL(boolean mayCopy) {
       if (mayCopy && ((ParseACL) acl).isShared()) {
         ParseACL copy = ((ParseACL) acl).copy();
         estimatedData.put(KEY_ACL, copy);
-        addToHashedObjects(copy);
         return copy;
       }
       return (ParseACL) acl;

Parse/src/main/java/com/parse/ParseObject.java

@@ -191,15 +191,6 @@ boolean isKeyMutable(String key) {
     }
   }
 
-  @Override
-  boolean isContainerObject(String key, Object object) {
-    if (KEY_AUTH_DATA.equals(key)) {
-      // We're tracking dirtiness of `authData` ourselves.
-      return false;
-    }
-    return super.isContainerObject(key, object);
-  }
-
   /**
    * Whether the ParseUser has been authenticated on this device. This will be true if the ParseUser
    * was obtained via a logIn or signUp method. Only an authenticated ParseUser can be saved (with
@@ -621,9 +612,6 @@ public Task<Void> then(Task<Void> task) throws Exception {
               new IllegalArgumentException("Attempt to merge currentUser with itself."));
         }
 
-        checkForChangesToMutableContainers();
-        user.checkForChangesToMutableContainers();
-
         boolean isLazy = user.isLazy();
         final String oldUsername = user.getUsername();
         final String oldPassword = user.getPassword();

Parse/src/main/java/com/parse/ParseUser.java

@@ -242,8 +242,6 @@ public void testSignUpAsyncWithMergeInDiskAnonymousUser() throws Exception {
     Task<Void> signUpTask = user.signUpAsync(Task.<Void>forResult(null));
     signUpTask.waitForCompletion();
 
-    // Make sure we checkForChangesToMutableContainers
-    verify(currentUser, times(1)).checkForChangesToMutableContainers();
     // Make sure currentUser copy changes from user
     verify(currentUser, times(1)).copyChangesFrom(user);
     // Make sure we update currentUser username and password
@@ -289,8 +287,6 @@ public void testSignUpAsyncWithMergeInDiskAnonymousUserSaveFailure() throws Exce
     Task<Void> signUpTask = user.signUpAsync(Task.<Void>forResult(null));
     signUpTask.waitForCompletion();
 
-    // Make sure we checkForChangesToMutableContainers
-    verify(partialMockCurrentUser, times(1)).checkForChangesToMutableContainers();
     // Make sure we update currentUser username and password
     verify(partialMockCurrentUser, times(1)).setUsername("userName");
     verify(partialMockCurrentUser, times(1)).setPassword("password");