All the domain commands follow a simple interface that allows the front controller to run them in Java

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All the domain commands follow a simple interface that allows the front controller to run them
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interface DomainCommand abstract public void run(Map params);
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Once the domain command has done what it needs to do, the Application Controller comes into play again when it's asked for the view
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class AssetApplicationController
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public String getView (String commandString, Map params) { return getResponse(commandString, getAssetStatus(params))getViewUrl(); }
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In this case the Application Controller doesn't return the full URL to the JSP It returns a string that the front controller turns into an URL I do this to avoid duplicating the URL paths in the responses It also makes it easy to add further indirection later should I need it
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The Application Controller can be loaded for use with code
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class AssetApplicationController public void addResponse(String event, Object state, Class domainCommand, String view) { Response newResponse = new Response (domainCommand, view); if ( ! eventscontainsKey(event)) eventsput(event, new HashMap()); getResponseMap(event)put(state, newResponse); } private static void loadApplicationController(AssetApplicationController appController) { appController = AssetApplicationControllergetDefault(); appControlleraddResponse( "return", AssetStatusON_LEASE, GatherReturnDetailsCommandclass, "return"); appControlleraddResponse( "return", AssetStatusIN_INVENTORY, NullAssetCommandclass, "illegalAction"); appControlleraddResponse( "damage", AssetStatusON_LEASE, InventoryDamageCommandclass, "leaseDamage"); appControlleraddResponse( "damage", AssetStatusIN_INVENTORY, LeaseDamageCommandclass, "inventoryDamage"); }
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Provides a coarse-grained facade on fine-grained objects to improve efficiency over a network
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In an object-oriented model, you do best with small objects that have small methods This gives you lots of opportunity for control and substitution of behavior, and to use good intention revealing naming to make an application easier to understand One of the consequences of such fine-grained behavior is that there's usually a great deal of interaction between objects, and that interaction usually requires lots of method invocations
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Within a single address space fine-grained interaction works well, but this happy state does not exist when you make calls between processes Remote calls are much more expensive because there's a lot more to do: Data may have to be marshaled, security may need to be checked, packets may need to be routed through switches If the two processes are running on machines on opposite sides of the globe, the speed of light may be a factor The brutal truth is that any inter-process call is orders of magnitude more expensive than an in-process call even if both processes are on the same machine Such a performance effect cannot be ignored, even for believers in lazy optimization
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As a result any object that's intended to be used as a remote objects needs a coarse-grained interface that minimizes the number of calls needed to get something done Not only does this affect your method calls, it also affects your objects Rather than ask for an order and its order lines individually, you need to access and update the order and order lines in a single call This affects your entire object structure You give up the clear intention and fine-grained control you get with small objects and small methods Programming becomes more difficult and your productivity slows
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A Remote Facade is a coarse-grained facade [Gang of Four] over a web of fine-grained objects None of the fine-grained objects have a remote interface, and the Remote Facade contains no domain logic All the Remote Facade does is translate coarse-grained methods onto the underlying fine-grained objects
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Remote Facade tackles the distribution problem which the standard OO approach of separating distinct responsibilities into different objects; and as a result it has become the standard pattern for this problem I recognize that fine-grained objects are the right answer for complex logic, so I ensure that any complex logic is placed in fine-grained objects that are designed to collaborate within a single process To allow efficient remote access to them, I make a separate facade object that acts as a remote interface As the name implies, the facade is merely a thin skin that switches from a coarse-grained to a fine-grained interface
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In a simple case, like an address object, a Remote Facade replaces all the getting and setting methods of the regular address object with one getter and one setter, often referred to as bulk accessors When a client calls a bulk setter, the address facade reads the data from the setting method and calls the individual accessors on the real address object (see Figure 151) and does nothing more This way all the logic of validation and computation stays on the address object where it can be factored cleanly and can be used by other fine-grained objects
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