text: /*
   * Copyright (C) 2009 Google Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above
   * copyright notice, this list of conditions and the following disclaimer
   * in the documentation and/or other materials provided with the
   * distribution.
   *     * Neither the name of Google Inc. nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef WebMessagePortChannelClient_h
  #define WebMessagePortChannelClient_h
  
  #include "WebCommon.h"
  #include <v8.h>
  
  namespace blink {
  
  // Provides an interface for users of WebMessagePortChannel to be notified
  // when messages are available. This also gives users of WebMessagePortChannel
  // access to the V8 Context this message port lives in.
  class BLINK_PLATFORM_EXPORT WebMessagePortChannelClient {
  public:
      // Alerts that new messages have arrived, which are retrieved by calling
      // WebMessagePortChannel::tryGetMessage. Note that this may be called
      // on any thread.
      virtual void messageAvailable() = 0;
  
      // Returns the V8 isolate this message port lives in.
      // Do not rely on this API, it is only exposed so content code can convert
      // messages to base::Value, and will be removed when this conversion can be
      // integrated into blink itself.
      virtual v8::Isolate* scriptIsolate() = 0;
  
      // Returns a V8 context messages sent to this port can be (de)serialized in.
      // Can return null if no valid V8 context could be determined.
      // Do not rely on this API, it is only exposed so content code can convert
      // messages to base::Value, and will be removed when this conversion can be
      // integrated into blink itself.
      // FIXME: Remove this method when no longer needed (http://crbug.com/461906)
      virtual v8::Local<v8::Context> scriptContextForMessageConversion() = 0;
  
  protected:
      ~WebMessagePortChannelClient() { }
  };
  
  } // namespace blink
  
  #endif
  