/**
    *
    * 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.hadoop.hbase.metrics.impl;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertNull;
  import static org.junit.Assert.assertTrue;
  
  import java.util.Collection;
  import java.util.Set;
  
  import org.apache.hadoop.hbase.testclassification.SmallTests;
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  
  import com.google.common.base.Supplier;
  import com.google.common.collect.Lists;
  
  @Category(SmallTests.class)
  public class TestRefCountingMap {
  
    private RefCountingMap<String, String> map;
  
    @Before
    public void setUp() {
      map = new RefCountingMap<>();
    }
  
    @Test
    public void testPutGet() {
      map.put("foo", new Supplier<String>() {
  
        @Override
        public String get() {
          return "foovalue";
        }
      });
  
      String v = map.get("foo");
      assertNotNull(v);
      assertEquals("foovalue", v);
    }
  
    @Test
    public void testPutMulti() {
      String v1 = map.put("foo", new Supplier<String>() {
  
        @Override
        public String get() {
          return "foovalue";
        }
      });
      String v2 = map.put("foo", new Supplier<String>() {
  
        @Override
        public String get() {
          return "foovalue2";
        }
      });
      String v3 = map.put("foo", new Supplier<String>() {
  
        @Override
        public String get() {
          return "foovalue3";
        }
      });
  
      String v = map.get("foo");
      assertEquals("foovalue", v);
      assertEquals(v, v1);
      assertEquals(v, v2);
      assertEquals(v, v3);
    }
  
    @Test
    public void testPutRemove() {
      map.put("foo", new Supplier<String>() {
  
        @Override
       public String get() {
         return "foovalue";
       }
     });
     String v = map.remove("foo");
     assertNull(v);
     v = map.get("foo");
     assertNull(v);
   }
 
   @Test
   public void testPutRemoveMulti() {
     map.put("foo", new Supplier<String>() {
 
       @Override
       public String get() {
         return "foovalue";
       }
     });
     map.put("foo", new Supplier<String>() {
 
       @Override
       public String get() {
         return "foovalue2";
       }
     });
     map.put("foo", new Supplier<String>() {
 
       @Override
       public String get() {
         return "foovalue3";
       }
     });
 
     // remove 1
     String v = map.remove("foo");
     assertEquals("foovalue", v);
 
     // remove 2
     v = map.remove("foo");
     assertEquals("foovalue", v);
 
     // remove 3
     v = map.remove("foo");
     assertNull(v);
     v = map.get("foo");
     assertNull(v);
   }
 
   @Test
   public void testSize() {
     assertEquals(0, map.size());
 
     // put a key
     map.put("foo", new Supplier<String>() {
 
       @Override
       public String get() {
         return "foovalue";
       }
     });
     assertEquals(1, map.size());
 
     // put a different key
     map.put("bar", new Supplier<String>() {
 
       @Override
       public String get() {
         return "foovalue2";
       }
     });
     assertEquals(2, map.size());
 
     // put the same key again
     map.put("bar", new Supplier<String>() {
 
       @Override
       public String get() {
         return "foovalue3";
       }
     });
     assertEquals(2, map.size()); // map should be same size
   }
 
   @Test
   public void testClear() {
     map.put("foo", new Supplier<String>() {
 
       @Override
       public String get() {
         return "foovalue";
       }
     });
     map.put("bar", new Supplier<String>() {
 
       @Override
       public String get() {
         return "foovalue2";
       }
     });
     map.put("baz", new Supplier<String>() {
 
       @Override
       public String get() {
         return "foovalue3";
       }
     });
 
     map.clear();
 
     assertEquals(0, map.size());
   }
 
 
   @Test
   public void testKeySet() {
     map.put("foo", new Supplier<String>() {
 
       @Override
       public String get() {
         return "foovalue";
       }
     });
     map.put("bar", new Supplier<String>() {
 
       @Override
       public String get() {
         return "foovalue2";
       }
     });
     map.put("baz", new Supplier<String>() {
 
       @Override
       public String get() {
         return "foovalue3";
       }
     });
 
     Set<String> keys = map.keySet();
     assertEquals(3, keys.size());
 
     for (String v : Lists.newArrayList("foo", "bar", "baz")) {
       assertTrue(keys.contains(v));
     }
   }
 
   @Test
   public void testValues() {
     map.put("foo", new Supplier<String>() {
 
       @Override
       public String get() {
         return "foovalue";
       }
     });
     map.put("foo", new Supplier<String>() {
 
       @Override
       public String get() {
         return "foovalue2";
       }
     });
     map.put("bar", new Supplier<String>() {
 
       @Override
       public String get() {
         return "foovalue3";
       }
     });
     map.put("baz", new Supplier<String>() {
 
       @Override
       public String get() {
         return "foovalue4";
       }
     });
 
     Collection<String> values = map.values();
     assertEquals(3, values.size());
 
     for (String v : Lists.newArrayList("foovalue", "foovalue3", "foovalue4")) {
       assertTrue(values.contains(v));
     }
   }
 }