// 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* a response may be outdated when the client receives it.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* and an outdated response would overwrite the correct result which was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.
}
}