2 * Copyright (C) 2014, United States Government, as represented by the
3 * Administrator of the National Aeronautics and Space Administration.
6 * The Java Pathfinder core (jpf-core) platform is licensed under the
7 * Apache License, Version 2.0 (the "License"); you may not use this file except
8 * in compliance with the License. You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0.
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
18 package gov.nasa.jpf.vm;
21 public abstract class AbstractRestorer<Saved> implements StateRestorer<Saved>, KernelState.ChangeListener {
23 protected Saved cached = null;
26 protected KernelState ks = null;
30 public void attach(VM vm) {
32 this.ks = vm.getKernelState();
36 public Saved getRestorableData() {
38 cached = computeRestorableData();
39 ks.pushChangeListener(this);
45 public void restore (Saved data) {
48 ks.pushChangeListener(this);
50 // invariant says we're already waiting for changes
56 public void kernelStateChanged (KernelState same) {
60 protected abstract Saved computeRestorableData();
61 protected abstract void doRestore(Saved data);