/*
    * ====================================================================
    * 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  package org.apache.hc.client5.http.impl.cache;
  
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.hc.client5.http.cache.HttpAsyncCacheStorage;
  import org.apache.hc.client5.http.cache.HttpCacheCASOperation;
  import org.apache.hc.client5.http.cache.HttpCacheEntry;
  import org.apache.hc.client5.http.cache.ResourceIOException;
  import org.apache.hc.client5.http.impl.Operations;
  import org.apache.hc.core5.concurrent.Cancellable;
  import org.apache.hc.core5.concurrent.FutureCallback;
  
  class SimpleHttpAsyncCacheStorage implements HttpAsyncCacheStorage {
  
      public final Map<String,HttpCacheEntry> map;
  
      public SimpleHttpAsyncCacheStorage() {
          map = new HashMap<>();
      }
  
      @Override
      public Cancellable putEntry(final String key, final HttpCacheEntry entry, final FutureCallback<Boolean> callback) {
          map.put(key, entry);
          if (callback != null) {
              callback.completed(true);
          }
          return Operations.nonCancellable();
      }
  
      public void putEntry(final String key, final HttpCacheEntry entry) {
          map.put(key, entry);
      }
  
      @Override
      public Cancellable getEntry(final String key, final FutureCallback<HttpCacheEntry> callback) {
          final HttpCacheEntry entry = map.get(key);
          if (callback != null) {
              callback.completed(entry);
          }
          return Operations.nonCancellable();
      }
  
      public HttpCacheEntry getEntry(final String key) {
          return map.get(key);
      }
  
      @Override
      public Cancellable removeEntry(final String key, final FutureCallback<Boolean> callback) {
          final HttpCacheEntry removed = map.remove(key);
          if (callback != null) {
              callback.completed(removed != null);
          }
          return Operations.nonCancellable();
      }
  
      @Override
      public Cancellable updateEntry(final String key, final HttpCacheCASOperation casOperation, final FutureCallback<Boolean> callback) {
          final HttpCacheEntry v1 = map.get(key);
          try {
              final HttpCacheEntry v2 = casOperation.execute(v1);
              map.put(key,v2);
              if (callback != null) {
                  callback.completed(true);
              }
          } catch (final ResourceIOException ex) {
              if (callback != null) {
                  callback.failed(ex);
              }
          }
          return Operations.nonCancellable();
      }
 
     @Override
     public Cancellable getEntries(final Collection<String> keys, final FutureCallback<Map<String, HttpCacheEntry>> callback) {
         final Map<String, HttpCacheEntry> resultMap = new HashMap<>(keys.size());
         for (final String key: keys) {
             final HttpCacheEntry entry = map.get(key);
             if (entry != null) {
                 resultMap.put(key, entry);
             }
         }
         callback.completed(resultMap);
         return Operations.nonCancellable();
     }
 
 }