1/* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package androidx.webkit; 18 19import junit.framework.Assert; 20 21import java.util.concurrent.Callable; 22 23/** 24 * A class for checking a specific statement {@link #check()} through polling, either until the 25 * statement is true, or until timing out. 26 * 27 * Copy-pasted from CTS: com.android.compatibility.common.util.PollingCheck. 28 */ 29public abstract class PollingCheck { 30 private static final long TIME_SLICE = 50; 31 private long mTimeout = 3000; 32 33 public PollingCheck(long timeout) { 34 mTimeout = timeout; 35 } 36 37 protected abstract boolean check(); 38 39 public void run() { 40 if (check()) { 41 return; 42 } 43 44 long timeout = mTimeout; 45 while (timeout > 0) { 46 try { 47 Thread.sleep(TIME_SLICE); 48 } catch (InterruptedException e) { 49 Assert.fail("unexpected InterruptedException"); 50 } 51 52 if (check()) { 53 return; 54 } 55 56 timeout -= TIME_SLICE; 57 } 58 59 Assert.fail("unexpected timeout"); 60 } 61 62 public static void check(CharSequence message, long timeout, Callable<Boolean> condition) 63 throws Exception { 64 while (timeout > 0) { 65 if (condition.call()) { 66 return; 67 } 68 69 Thread.sleep(TIME_SLICE); 70 timeout -= TIME_SLICE; 71 } 72 73 Assert.fail(message.toString()); 74 } 75} 76