Nested Circuits in Java

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Nested Circuits
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You know from 37 that all program actions begin as action requests fuseactions which are sent to the Fusebox core file, FBX_Fusebox30_CFnn.cfm. One of the jobs of this core file is to decipher the circuit alias part of a compound fuseaction.
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38 Advanced Fusebox
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In a compound fuseaction such as Products.checkInventory, the core file reads the circuit alias (Products, in this case) and, by using the FBX_Circuits.cfm file, determines which circuit the fuseaction request, checkInventory, belongs to. It then creates a fuseaction path beginning with the home circuit and traversing the circuits needed to arrive at the target circuit. In the case shown in Figure 38-1, the fuseaction path for Products.checkInventory is MyApp/ Admin/Products. The core file uses this information to include the FBX_Settings.cfm files for each circuit in the fuseaction path, from home circuit down to target circuit. This mechanism provides for a type of inheritance, as variables set (or code run) in FBX_Settings.cfm files farther up the fuseaction path (closer to the home circuit) bear on those farther down. Figure 38-1: A Fusebox application s directory structure.
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You also know from 37 that circuits are ways of creating logical groupings of fuseactions and associated fuses. Although no rule exists for determining the identity or scope of circuits, common sense is usually a reliable guide; people usually place fuseactions related to creating, editing, or deleting a product into a circuit called Products. Circuits are often chosen to model a real-world entity. If you were dealing with various workers, for example, you may create a circuit called Employee. That s often sufficient, but on certain occasions, circuits should exist as separate entities but be dependently related. These are often known as is-a or type-of relationships. By using this Employee example, you may find that an employee is best thought of as a type of person. In that case, you could decide to create a Person circuit that acts as a parent to Employee. Such dependent or parent-child relationships are modeled as nested circuits in Fusebox. Figure 38-2 shows a simple Person-Employee nested relationship. Figure 38-2: A simple parent-child relationship modeled as a nested circuit.
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Part VII ColdFusion MX Development Practices
Now, say that you want to model independent consultants. Because an independent consultant is a type of person, you create a subcircuit called IndependentConsultant, as shown in Figure 38-3. Figure 38-3: Further modeling parent-child relationships.
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You can go even farther, creating HourlyWorker, SalariedWorker, and ContractWorker circuits all as subcircuits to Employee, as shown in Figure 38-4. Figure 38-4: More complex nested circuits.
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The appeal to such an approach is not only logical consistency, but also the capability to determine behavior common to siblings and abstract it into an ancestor circuit. Creating a new worker, for example, entails certain common tasks, whether that worker belongs to HourlyWorker, SalariedWorker, or ContractWorker. Common behavior may include adding the new worker to a database, ordering a package of Welcome to the Company materials sent to the worker s home, and so on. Rather than duplicating this code across three circuits, abstracting the behavior upward makes more sense: Take the common behavior and assign it to a fuseaction called new in the Employee circuit, leaving the individual differences to be handled by each subcircuit. For its part, the Employee circuit may ask the Person circuit to first create a new person before proceeding, as shown in Figure 38-5.
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38 Advanced Fusebox
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Figure 38-5: Distributed functionality across circuits. Such partitioning of functionality among related circuits can be done in a number of ways. Prior to ColdFusion MX, the most common way was by calling the Fusebox application as though it were a custom tag, by using the cfmodule tag. Listing 38-7 shows the code block for the fuseaction
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