code: /*
   * Copyright 2012-2018 Chronicle Map Contributors
   *
   * 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 net.openhft.chronicle.map;
  
  import net.openhft.chronicle.bytes.BytesStore;
  import net.openhft.chronicle.core.Jvm;
  import net.openhft.chronicle.core.io.Closeable;
  import net.openhft.chronicle.core.util.SerializableFunction;
  import org.jetbrains.annotations.NotNull;
  import org.junit.Assert;
  
  import java.io.File;
  import java.lang.reflect.Type;
  import java.util.Collection;
  import java.util.Map;
  import java.util.Set;
  import java.util.concurrent.ConcurrentMap;
  import java.util.function.Consumer;
  import java.util.function.Predicate;
  
  /**
   * @author Rob Austin.
   */
  public class ReplicationCheckingMap<K, V> implements ChronicleMap<K, V> {
  
      ChronicleMap<K, V> map1;
      ChronicleMap<K, V> map2;
  
      public ReplicationCheckingMap(ChronicleMap map1, ChronicleMap map2) {
          this.map1 = map1;
          this.map2 = map2;
      }
  
      @Override
      public V putIfAbsent(@NotNull K key, V value) {
          return map1.putIfAbsent(key, value);
      }
  
      @Override
      public boolean remove(@NotNull Object key, Object value) {
          return map1.remove(key, value);
      }
  
      @Override
      public boolean replace(@NotNull K key, @NotNull V oldValue, @NotNull V newValue) {
          return map1.replace(key, oldValue, newValue);
      }
  
      @Override
      public V replace(@NotNull final K key, @NotNull final V value) {
          return check(new Call<K, V>() {
                           @Override
                           public Object method(ConcurrentMap<K, V> map) {
                               return map.replace(key, value);
                           }
                       }
          );
      }
  
      @Override
      public int size() {
          return check(new Call<K, V>() {
                           @Override
                           public Object method(ConcurrentMap<K, V> map) {
                               return map.size();
                           }
                       }
          );
      }
  
      public <R> R check(Call instance) {
          R r1 = null;
          R r2 = null;
          for (int i = 0; i < 50; i++) {
              r1 = (R) instance.method(map1);
              r2 = (R) instance.method(map2);
  
              if (r1 != null && r1.equals(r2))
                  return r1;
  
              if (i > 30) {
                  Jvm.pause(i);
              } else {
                  Thread.yield();
              }
          }
  
          Assert.assertEquals(map1, map2);
          System.out.print(map1);
          System.out.print(map2);
  
          if (r1 != null)
              Assert.assertEquals(r1.toString(), r2.toString());
  
          return (R) r1;
      }
  
      @Override
      public boolean isEmpty() {
          return check(new Call<K, V>() {
                           @Override
                           public Object method(ConcurrentMap<K, V> map) {
                               return map.isEmpty();
                           }
                       }
          );
      }
  
      @Override
      public boolean containsKey(final Object key) {
          return check(new Call<K, V>() {
                           @Override
                           public Object method(ConcurrentMap<K, V> map) {
                               return map.containsKey(key);
                           }
                       }
          );
      }
  
      @Override
      public boolean containsValue(final Object value) {
          return check(new Call<K, V>() {
                           @Override
                           public Object method(ConcurrentMap<K, V> map) {
                               return map.containsValue(value);
                           }
                       }
          );
      }
  
      @Override
      public V get(final Object key) {
          return check(new Call<K, V>() {
                           @Override
                           public Object method(ConcurrentMap<K, V> map) {
                               return map.get(key);
                           }
                       }
          );
      }
  
      @Override
      public V put(K key, V value) {
          return map1.put(key, value);
      }
  
      @Override
      public V remove(Object key) {
          return map1.remove(key);
      }
  
      @Override
      public void putAll(@NotNull Map<? extends K, ? extends V> m) {
          map1.putAll(m);
      }
  
      @Override
      public void clear() {
          map1.clear();
      }
  
      @NotNull
      @Override
      public Set<K> keySet() {
          return check(new Call<K, V>() {
                           @Override
                           public Object method(ConcurrentMap<K, V> map) {
                               return map.keySet();
                           }
                       }
          );
      }
  
      @NotNull
      @Override
      public Collection<V> values() {
          return check(new Call<K, V>() {
                           @Override
                           public Collection<V> method(ConcurrentMap<K, V> map) {
                               return map.values();
                           }
                       }
          );
      }
  
      @NotNull
      @Override
      public Set<Entry<K, V>> entrySet() {
          return check(new Call<K, V>() {
                           @Override
                           public Object method(ConcurrentMap<K, V> map) {
                               return (map.entrySet());
                           }
                       }
          );
      }
  
      @Override
      public long longSize() {
          return map1.longSize();
      }
  
      @Override
      public long offHeapMemoryUsed() {
          return map1.offHeapMemoryUsed();
      }
  
      @Override
      public V getUsing(K key, V usingValue) {
          return map1.getUsing(key, usingValue);
      }
  
      @Override
      public <R> R getMapped(K key, @NotNull SerializableFunction<? super V, R> function) {
          return map1.getMapped(key, function);
      }
  
      @Override
      public void getAll(File toFile) {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public void putAll(File fromFile) {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public Class<K> keyClass() {
          return map1.keyClass();
      }
  
      @Override
      public Type keyType() {
          return map1.keyType();
      }
  
      @Override
      public boolean forEachEntryWhile(Predicate<? super MapEntry<K, V>> predicate) {
          return map1.forEachEntryWhile(predicate);
      }
  
      @Override
      public void forEachEntry(Consumer<? super MapEntry<K, V>> action) {
          map1.forEachEntry(action);
      }
  
      @Override
      public Class<V> valueClass() {
          return map1.valueClass();
      }
  
      @Override
      public Type valueType() {
          return map1.valueType();
      }
  
      @Override
      public V acquireUsing(@NotNull K key, V usingValue) {
          return map1.acquireUsing(key, usingValue);
      }
  
      @NotNull
      @Override
      public Closeable acquireContext(
              @NotNull K key, @NotNull V usingValue) {
          throw new UnsupportedOperationException();
      }
  
      @NotNull
      @Override
      public ExternalMapQueryContext<K, V, ?> queryContext(K key) {
          throw new UnsupportedOperationException();
      }
  
      @NotNull
      @Override
      public ExternalMapQueryContext<K, V, ?> queryContext(net.openhft.chronicle.hash.Data<K> key) {
          throw new UnsupportedOperationException();
      }
  
      @NotNull
      @Override
      public ExternalMapQueryContext<K, V, ?> queryContext(
              BytesStore keyBytes, long offset, long size) {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public MapSegmentContext<K, V, ?> segmentContext(int segmentIndex) {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public int segments() {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public File file() {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public String name() {
          throw new UnsupportedOperationException();
      }
  
      @NotNull
      @Override
      public String toIdentityString() {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public void close() {
          map1.close();
          map2.close();
      }
  
      @Override
      public boolean isOpen() {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public boolean equals(Object o) {
          return map1.equals(o);
      }
  
      @Override
      public int hashCode() {
          return map1.hashCode();
      }
  
      public String toString() {
          return map1.toString();
      }
  
      interface Call<K, V> {
          Object method(ConcurrentMap<K, V> map);
      }
  }
  