| // Copyright (C) 2013 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.client.ui; |
| |
| import com.google.gerrit.client.rpc.GerritCallback; |
| |
| /** |
| * GerritCallback to be used on user interfaces that allow filtering to handle |
| * RPC's that request filtering. The user may change the filter quickly so that |
| * a response may be outdated when the client receives it. In this case the |
| * response must be ignored because the responses to RCP's may come out-of-order |
| * and an outdated response would overwrite the correct result which was |
| * received before. |
| */ |
| public class IgnoreOutdatedFilterResultsCallbackWrapper<T> extends GerritCallback<T> { |
| private final FilteredUserInterface filteredUI; |
| private final String myFilter; |
| private final GerritCallback<T> cb; |
| |
| public IgnoreOutdatedFilterResultsCallbackWrapper( |
| final FilteredUserInterface filteredUI, final GerritCallback<T> cb) { |
| this.filteredUI = filteredUI; |
| this.myFilter = filteredUI.getCurrentFilter(); |
| this.cb = cb; |
| } |
| |
| @Override |
| public void onSuccess(final T result) { |
| if ((myFilter == null && filteredUI.getCurrentFilter() == null) |
| || (myFilter != null && myFilter.equals(filteredUI.getCurrentFilter()))) { |
| cb.onSuccess(result); |
| } |
| // Else ignore the result, the user has already changed the filter |
| // and the result is not relevant anymore. If multiple RPC's are |
| // fired the results may come back out-of-order and a non-relevant |
| // result could overwrite the correct result if not ignored. |
| } |
| } |