solr/core/src/test/org/apache/solr/cloud/TestSizeLimitedDistributedMap.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.
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package org.apache.solr.cloud;

import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import org.apache.solr.common.cloud.SolrZkClient;

public class TestSizeLimitedDistributedMap extends TestDistributedMap {

  public void testCleanup() throws Exception {
    final List<String> deletedItems = new LinkedList<>();
    final Set<String> expectedKeys = new HashSet<>();
    int numResponsesToStore=TEST_NIGHTLY?Overseer.NUM_RESPONSES_TO_STORE:100;
    
    try (SolrZkClient zkClient = new SolrZkClient(zkServer.getZkHost(), 10000)) {
      String path = getAndMakeInitialPath(zkClient);
      DistributedMap map = new SizeLimitedDistributedMap(zkClient, path, numResponsesToStore, (element)->deletedItems.add(element));
      for (int i = 0; i < numResponsesToStore; i++) {
        map.put("xyz_" + i, new byte[0]);
        expectedKeys.add("xyz_" + i);
      }

      assertEquals("Number of items do not match", numResponsesToStore, map.size());
      assertTrue("Expected keys do not match", expectedKeys.containsAll(map.keys()));
      assertTrue("Expected keys do not match", map.keys().containsAll(expectedKeys));
      // add another to trigger cleanup
      map.put("xyz_" + numResponsesToStore, new byte[0]);
      expectedKeys.add("xyz_" + numResponsesToStore);
      assertEquals("Distributed queue was not cleaned up",
          numResponsesToStore - (numResponsesToStore / 10) + 1, map.size());
      for (int i = numResponsesToStore; i >= numResponsesToStore / 10; i--) {
        assertTrue(map.contains("xyz_" + i));
      }
      for (int i = numResponsesToStore / 10 - 1; i >= 0; i--) {
        assertFalse(map.contains("xyz_" + i));
        assertTrue(deletedItems.contains("xyz_" + i));
        expectedKeys.remove("xyz_" + i);
      }
      assertTrue("Expected keys do not match", expectedKeys.containsAll(map.keys()));
      assertTrue("Expected keys do not match", map.keys().containsAll(expectedKeys));
      map.remove("xyz_" + numResponsesToStore);
      assertFalse("map.remove shouldn't trigger the observer", 
          deletedItems.contains("xyz_" + numResponsesToStore));
    }
  }
  
  protected DistributedMap createMap(SolrZkClient zkClient, String path) {
    return new SizeLimitedDistributedMap(zkClient, path, Overseer.NUM_RESPONSES_TO_STORE, null);
  }
  
}