solr/solrj/src/test/org/apache/solr/common/util/TestRetryUtil.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.solr.common.util;

import java.util.concurrent.atomic.AtomicInteger;

import org.apache.solr.SolrTestCaseJ4;
import org.apache.solr.common.SolrException;
import org.apache.solr.common.SolrException.ErrorCode;


public class TestRetryUtil extends SolrTestCaseJ4 {

  public void testRetryOnThrowable() throws Throwable {
    final AtomicInteger executes = new AtomicInteger();
    RetryUtil.retryOnThrowable(SolrException.class, 10000, 10, () -> {
      int calls = executes.incrementAndGet();
      if (calls <= 2) {
        throw new SolrException(ErrorCode.SERVER_ERROR, "Bad Stuff Happened");
      }
    });
    
    assertEquals(3, executes.get());
    
    final AtomicInteger executes2 = new AtomicInteger();
    boolean caughtSolrException = false;
    try {
      RetryUtil.retryOnThrowable(IllegalStateException.class, 10000, 10,
          () -> {
            int calls = executes2.incrementAndGet();
            if (calls <= 2) {
              throw new SolrException(ErrorCode.SERVER_ERROR,
                  "Bad Stuff Happened");
            }
          });
    } catch (SolrException e) {
      caughtSolrException = true;
    }
    assertTrue(caughtSolrException);
    assertEquals(1, executes2.get());
    
    final AtomicInteger executes3 = new AtomicInteger();
    caughtSolrException = false;
    try {
      RetryUtil.retryOnThrowable(SolrException.class, 1000, 10, () -> {
        executes3.incrementAndGet();
        throw new SolrException(ErrorCode.SERVER_ERROR, "Bad Stuff Happened");
      });
    } catch (SolrException e) {
      caughtSolrException = true;
    }
    
    assertTrue(caughtSolrException);
    assertTrue(executes3.get() > 1);
  }

}