content: /**
   * Copyright 2010 the original author or authors.
   *
   * 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.github.zkclient;
  
  
  import java.io.File;
  import java.io.IOException;
  import java.util.concurrent.Callable;
  import java.util.concurrent.TimeUnit;
  
  import org.junit.Ignore;
  
  import com.github.zkclient.ZkServer;
  
  @Ignore
  public class TestUtil {
  
      static {
          System.setProperty("zookeeper.preAllocSize", "1024");//1M data log
      }
      /**
       * This waits until the provided {@link Callable} returns an object that is equals to the given expected value or
       * the timeout has been reached. In both cases this method will return the return value of the latest
       * {@link Callable} execution.
       * 
       * @param expectedValue
       *            The expected value of the callable.
       * @param callable
       *            The callable.
       * @param <T>
       *            The return type of the callable.
       * @param timeUnit
       *            The timeout timeunit.
       * @param timeout
       *            The timeout.
       * @return the return value of the latest {@link Callable} execution.
       * @throws Exception
       * @throws InterruptedException
       */
      public static <T> T waitUntil(T expectedValue, Callable<T> callable, TimeUnit timeUnit, long timeout) throws Exception {
          long startTime = System.currentTimeMillis();
          do {
              T actual = callable.call();
              if (expectedValue.equals(actual)) {
                  return actual;
              }
              if (System.currentTimeMillis() > startTime + timeUnit.toMillis(timeout)) {
                  return actual;
              }
              Thread.sleep(50);
          } while (true);
      }
  
  }