tests/robotests/src/com/android/customization/testutils/Wait.java

/*
 * Copyright (C) 2019 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.android.customization.testutils;


import android.os.SystemClock;

import org.junit.Assert;

/**
 * A utility class for waiting for a condition to be true.
 */
public class Wait {

    private static final long DEFAULT_SLEEP_MS = 200;

    public static void atMost(String message, Condition condition, long timeout) {
        atMost(message, condition, timeout, DEFAULT_SLEEP_MS);
    }

    public static void atMost(String message, Condition condition, long timeout, long sleepMillis) {
        long endTime = SystemClock.uptimeMillis() + timeout;
        while (SystemClock.uptimeMillis() < endTime) {
            try {
                if (condition.isTrue()) {
                    return;
                }
            } catch (Throwable t) {
                throw new RuntimeException(t);
            }
            SystemClock.sleep(sleepMillis);
        }

        // Check once more before returning false.
        try {
            if (condition.isTrue()) {
                return;
            }
        } catch (Throwable t) {
            throw new RuntimeException(t);
        }
        Assert.fail(message);
    }
}