text: #ifndef COORDINATORCONTEXT_H
  #define COORDINATORCONTEXT_H
  /*
   * 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.
   */
  
  
  #include "SenderContext.h"
  #include <qpid/types/Variant.h>
  #include "qpid/sys/ExceptionHolder.h"
  #include <boost/enable_shared_from_this.hpp>
  #include <boost/function.hpp>
  
  struct pn_session_t;
  
  namespace qpid {
  namespace messaging {
  namespace amqp {
  
  class SessionContext;
  class ConnectionContext;
  
  /**
   * Track the current transaction for a session.
   *
   * Implements SenderContext, to send transaction command messages to remote coordinator.
   */
  class Transaction : public SenderContext, public boost::enable_shared_from_this<Transaction> {
    public:
      typedef boost::shared_ptr<SessionContext> SessionPtr;
  
      typedef boost::function<void (boost::shared_ptr<SessionContext> ssn,
                                    boost::shared_ptr<SenderContext> snd,
                                    const qpid::messaging::Message& message,
                                    bool sync,
                                    SenderContext::Delivery** delivery)> SendFunction;
  
      Transaction(pn_session_t*);
  
      sys::ExceptionHolder error;
  
      /** Declare a transaction using connection and session to send to remote co-ordinator. */
      void declare(SendFunction, const SessionPtr& session);
  
      /** Discharge a transaction using connection and session to send to remote co-ordinator.
       *@param fail: true means rollback, false means commit.
       */
      void discharge(SendFunction, const SessionPtr& session, bool fail);
  
      /** Update a delivery with a transactional accept state. */
      void acknowledge(pn_delivery_t* delivery);
  
      /** Get delivery state to attach to transfers sent in a transaction. */
      types::Variant getSendState() const;
  
      /** Override SenderContext::getTarget with a more readable value */
      const std::string& getTarget() const;
  
      bool isCommitting() const { return committing; }
  
    protected:
      // SenderContext overrides
      void configure();
      void verify();
  
    private:
      std::string id;
      types::Variant sendState;
      types::Variant acceptState;
      bool committing;
  
  
      void clear();
      void setId(const SenderContext::Delivery& delivery);
      void setId(const std::string& id);
  };
  
  }}}
  
  #endif
  