org.ehoffman.advised.logback.internal.Wait Maven / Gradle / Ivy
/*
* The MIT License
* Copyright © 2016 Rex Hoffman
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.ehoffman.advised.logback.internal;
import java.util.concurrent.CompletionException;
import java.util.function.Supplier;
public class Wait {
private Supplier supplier = null;
private int retries = 1;
public Wait on(Supplier supplier) {
this.supplier = supplier;
return this;
}
public Wait trying(int times) {
this.retries = times;
return this;
}
/**
* Waits on the prior specified supplier to be able to return a non null value, or throw an {@link InterruptedException}.
* @return the output if available before the number of retries are up,
* @throws RuntimeException if the last retry resulted in an exception.
* @throws CompletionException if the process is interrupted.
*/
public T toComplete() {
T output = null;
int retryCount = 0;
while (output == null && retryCount < retries) {
try {
output = supplier.get();
retryCount++;
if (output == null) {
Thread.sleep(500);
}
} catch (RuntimeException ex) {
if (retryCount == retries - 1) {
throw ex;
}
retryCount++;
} catch (InterruptedException iex) {
throw new CompletionException(iex);
}
}
return output;
}
}