ch.exense.step.library.selenium.Poller Maven / Gradle / Ivy
/*******************************************************************************
* Copyright 2021 exense GmbH
*
* 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 ch.exense.step.library.selenium;
import java.util.function.Supplier;
/**
* Poller class to check the valid status of a condition every 100ms, used to avoid the most frequent Selenium exceptions encountered
*/
public class Poller {
/**
* Static method to retry the execution of a predicate over a timeout
* @param the type of object returned by the predicate execution
* @param predicate the predicate to execute
* @param timeout the duration to retry to execute the predicate in second
* @return the object returned by the predicate execution
*/
public static T retryIfFails(Supplier predicate, long timeout) {
long t1 = System.currentTimeMillis();
Exception lastException = null;
do {
try {
T result = predicate.get();
if (result != null) {
return result;
}
} catch (Exception e) {
lastException = e;
}
try {
Thread.sleep(100);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
} while (System.currentTimeMillis() < t1 + (timeout * 1000));
throw new RuntimeException("Timeout while waiting for condition to apply.", lastException);
}
public static void retryWhileFalse(Supplier condition, long timeout) {
long t1 = System.currentTimeMillis();
Exception lastException = null;
do {
try {
if (condition.get()) {
return;
}
} catch (Exception e) {
lastException = e;
}
try {
Thread.sleep(100);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
} while (System.currentTimeMillis() < t1 + (timeout * 1000));
throw new RuntimeException("Timeout while waiting for condition to apply.", lastException);
}
}