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CHAPTER 9 STATE NAVIGATION PATTERN
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else { state = _stateManager.copyState( data._stateHeader, data._path, data._windowName); } httpresponse.setContentType( _resourceStateContentType); httpresponse.setHeader( _XPageState, state.getStateIdentifier()); httpresponse.setStatus( 200, "success"); PrintWriter out = httpresponse.getWriter(); out.print( state.getBuffer()); return; } else if( data._operation == OP_POST) { ServletInputStream input = httprequest.getInputStream(); byte[] bytearray = new byte[ httprequest.getContentLength()]; input.read( bytearray); State state = _stateManager.copyState( data._stateHeader, data._path, data._windowName); state.setBuffer( new String( bytearray).toString()); httpresponse.addHeader( _XPageState, state.getStateIdentifier()); chain.doFilter( httprequest, httpresponse); return; }
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} In the implementation of runFilter, the first parameter is the object instance allocated by the method initializeRequest. And as with isTrigger, a typecast is made to convert the type and assign it to the variable data. From there, the decision blocks are based on the data members of the variable data that were assigned in isTrigger. There are two state operations: retrieve state and post state. The first decision block (== OP_RETRIEVE) tests whether the operation is a state retrieval, and the second decision block (== OP_POST) tests whether the operation is a post. If the operation is a state retrieval and the asked-for state is none (indicating that the client has not associated a state with an HTML page), an empty state is created. A new empty state is created by using the method getEmptyStateHashcode(), and the method getHashcode() retrieves the hash code of a state. By default, when creating an empty state, a hash code will automatically be created. Using the method copyState copies the old state to a new state, and is explained shortly. After calling the copyState method, various methods on the httpresponse variable are called to generate the response. If the operation is a posting, the posted stream is retrieved from the request by using the method input.read. The read buffer is stored in the variable bytearray, which happens to be an array of bytes. As when a state is retrieved, the state is copied by using the method copyState, and then assigned by using the method state.setBuffer. The state is copied from the original reference, and the new data overwrites the old. By copying a state, the state manager can create a trail of dependencies and associations that could be used by the state manager for optimization purposes. In the response, the newly generated state header is added by using the method addHeader. The last and very important step is to call the method chain.doFilter because that allows the posting to be processed by a handler. This raises the question, If the state is stored, why
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CHAPTER 9 STATE NAVIGATION PATTERN
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process it Let s say that I buy a ticket and fill out the form. When I click the Submit button, I want to buy the ticket; but when I click Back, I want to know the form details used to buy the ticket. Knowing the details, I can click Forward, and a ticket will not be bought twice which would have happened if I had to click Submit. Therefore, to buy the ticket, some handler has to process the posted data, thus requiring the State filter to store the data and to let the handler process the data. An Example State Manager Handler In the StateFilter implementation, the variable _stateManager references the type StateManager. The type StateManager is an interface and manages the state that is posted and retrieved. Using interfaces makes it possible to separate intention from implementation as per the Bridge pattern. The State interface is defined as follows: public interface State { public String getURL(); public void setURL( String URL); public String getWindowName(); public void setWindowName( String windowname); public String getBuffer(); public void setBuffer( String buffer); public String getStateIdentifier(); public void setStateIdentifier( String hashcode); EBVN } The interface is based on four properties (URL, WindowName, Buffer, and StateIdentifier) that are implemented as getters and setters. The property Buffer is used to assign and retrieve the state sent by the client. The property StateIdentifier is used to assign and retrieve the state identifier of an HTML page. The property URL is the URL of the state, and finally WindowName is the associated window name. A minimal implementation of the State interface would define four private data members of the type String, String, String, and String. What is more complicated is the implementation of the StateManager interface. An advanced implementation is beyond the scope of this book and depends on the context of the problem. The StateManager interface is important in the overall architecture because it is meant to be shared by servlets and external processes. A servlet could be used to manage and accumulate the state, whereas a J2EE server could be used to execute the transaction on the accumulated state. The idea is to implement the State filter and let the architecture manage the state. The StateManager interface is defined as follows: public interface StateManager { public State getEmptyState( String url, String windowName); public State copyState( String stateIdentifier, String url, String windowName); public State[] getStateWindowName( String windowName); }
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