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/*
* Copyright (C) 2018 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 android.testing;
import junit.framework.Assert;
import java.util.concurrent.Callable;
public abstract class PollingCheck {
private static final long TIME_SLICE = 50;
private long mTimeout = 3000;
public static interface PollingCheckCondition {
boolean canProceed();
}
public PollingCheck() {
}
public PollingCheck(long timeout) {
mTimeout = timeout;
}
protected abstract boolean check();
public void run() {
if (check()) {
return;
}
long timeout = mTimeout;
while (timeout > 0) {
try {
Thread.sleep(TIME_SLICE);
} catch (InterruptedException e) {
Assert.fail("unexpected InterruptedException");
}
if (check()) {
return;
}
timeout -= TIME_SLICE;
}
Assert.fail("unexpected timeout");
}
public static void check(CharSequence message, long timeout, Callable<Boolean> condition)
throws Exception {
while (timeout > 0) {
if (condition.call()) {
return;
}
Thread.sleep(TIME_SLICE);
timeout -= TIME_SLICE;
}
Assert.fail(message.toString());
}
public static void waitFor(final PollingCheckCondition condition) {
new PollingCheck() {
@Override
protected boolean check() {
return condition.canProceed();
}
}.run();
}
public static void waitFor(long timeout, final PollingCheckCondition condition) {
new PollingCheck(timeout) {
@Override
protected boolean check() {
return condition.canProceed();
}
}.run();
}
}
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