code: /*
   * 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.skywalking.oap.server.core.analysis.data;
  
  import org.apache.skywalking.oap.server.core.storage.ComparableStorageData;
  import org.apache.skywalking.oap.server.core.storage.StorageID;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  
  import java.util.Objects;
  
  public class LimitedSizeBufferedDataTest {
      @Test
      public void testPut() {
          LimitedSizeBufferedData<MockStorageData> collection = new LimitedSizeBufferedData<>(5);
          collection.accept(new MockStorageData(1));
          collection.accept(new MockStorageData(3));
          collection.accept(new MockStorageData(5));
          collection.accept(new MockStorageData(7));
          collection.accept(new MockStorageData(9));
  
          MockStorageData income = new MockStorageData(4);
          collection.accept(income);
  
          int[] expected = new int[] {
              3,
              4,
              5,
              7,
              9
          };
          int i = 0;
          for (MockStorageData data : collection.read()) {
              Assertions.assertEquals(expected[i++], data.latency);
          }
      }
  
      private class MockStorageData implements ComparableStorageData {
          private long latency;
  
          public MockStorageData(long latency) {
              this.latency = latency;
          }
  
          @Override
          public int compareTo(Object o) {
              MockStorageData target = (MockStorageData) o;
              return (int) (latency - target.latency);
          }
  
          @Override
          public StorageID id() {
              return new StorageID().append("ID", "id");
          }
  
          @Override
          public boolean equals(Object o) {
              return true;
          }
  
          @Override
          public int hashCode() {
              return Objects.hash(1);
          }
      }
  }
  