/*
    * ====================================================================
    * 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.cache;
  
  import java.util.Collection;
  import java.util.Map;
  
  import org.apache.hc.client5.http.impl.Operations;
  import org.apache.hc.core5.annotation.Contract;
  import org.apache.hc.core5.annotation.ThreadingBehavior;
  import org.apache.hc.core5.concurrent.Cancellable;
  import org.apache.hc.core5.concurrent.FutureCallback;
  import org.apache.hc.core5.util.Args;
  
  /**
   * {@link HttpAsyncCacheStorage} implementation that emulates asynchronous
   * behavior using an instance of classic {@link HttpCacheStorage}.
   *
   * @since 5.0
   */
  @Contract(threading = ThreadingBehavior.SAFE_CONDITIONAL)
  public final class HttpAsyncCacheStorageAdaptor implements HttpAsyncCacheStorage {
  
      private final HttpCacheStorage cacheStorage;
  
      public HttpAsyncCacheStorageAdaptor(final HttpCacheStorage cacheStorage) {
          this.cacheStorage = Args.notNull(cacheStorage, "Cache storage");
      }
  
      @Override
      public Cancellable putEntry(final String key, final HttpCacheEntry entry, final FutureCallback<Boolean> callback) {
          Args.notEmpty(key, "Key");
          Args.notNull(entry, "Cache entry");
          Args.notNull(callback, "Callback");
          try {
              cacheStorage.putEntry(key, entry);
              callback.completed(Boolean.TRUE);
          } catch (final Exception ex) {
              callback.failed(ex);
          }
          return Operations.nonCancellable();
      }
  
      @Override
      public Cancellable getEntry(final String key, final FutureCallback<HttpCacheEntry> callback) {
          Args.notEmpty(key, "Key");
          Args.notNull(callback, "Callback");
          try {
              final HttpCacheEntry entry = cacheStorage.getEntry(key);
              callback.completed(entry);
          } catch (final Exception ex) {
              callback.failed(ex);
          }
          return Operations.nonCancellable();
      }
  
      @Override
      public Cancellable removeEntry(final String key, final FutureCallback<Boolean> callback) {
          Args.notEmpty(key, "Key");
          Args.notNull(callback, "Callback");
          try {
              cacheStorage.removeEntry(key);
              callback.completed(Boolean.TRUE);
          } catch (final Exception ex) {
              callback.failed(ex);
          }
          return Operations.nonCancellable();
      }
  
      @Override
      public Cancellable updateEntry(
              final String key, final HttpCacheCASOperation casOperation, final FutureCallback<Boolean> callback) {
          Args.notEmpty(key, "Key");
          Args.notNull(casOperation, "CAS operation");
          Args.notNull(callback, "Callback");
         try {
             cacheStorage.updateEntry(key, casOperation);
             callback.completed(Boolean.TRUE);
         } catch (final Exception ex) {
             callback.failed(ex);
         }
         return Operations.nonCancellable();
     }
 
     @Override
     public Cancellable getEntries(final Collection<String> keys, final FutureCallback<Map<String, HttpCacheEntry>> callback) {
         Args.notNull(keys, "Key");
         Args.notNull(callback, "Callback");
         try {
             callback.completed(cacheStorage.getEntries(keys));
         } catch (final Exception ex) {
             callback.failed(ex);
         }
         return Operations.nonCancellable();
     }
 
 }