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Figure 2-8. State Composition View The State Composition View allows you to add EventActivity activities to the FirstState State activity. You can return to the State Composition View (the normal workflow design surface) by right-clicking anywhere on this design surface and choosing Back To State Composition View. Another way to return to the State Composition View is to click either the Workflow1 or FirstState links on the top left of this window. If you click the FirstState link at the top left, you ll return to the FirstState state, and if you click the Workflow1 link at the top left, you ll return to the overall workflow. They re one and the same for now because you have a small workflow, but this can be useful if you have a long workflow. If you re back in the State Composition View (the default workflow design surface), then you ll see the EventDriven activity added within the FirstState State activity, as shown in Figure 2-9. If you double-click the eventDrivenActivity1 state within the FirstState State activity, you ll get back to the EventDrivenActivity. You ll see an exclamation point in the right corner of the EventDrivenActivity1 activity within the FirstState State activity. When you click the exclamation point, you ll see that a child activity must be present. For this first, simple State Machine workflow, drag and drop the Delay activity from the Toolbox. Make sure to drop it within the EventDrivenActivity1 activity. You ll use this Delay activity to pause a set period of time before changing states. All this workflow is going to do is wait a set period of time, move to the next state, pause a set period of time, and then move to the completed state.

The CSR contains information about your organization and the site you wish to protect You package this information into a single file that makes it easy to send to a CA The CSR is protected by a key to prevent any of the information you save from being altered Creating a CSR requires several steps First, you must produce a key You do this using OpenSSL in genrsa mode; you must specify an output file name for your key The hostname with key extension makes it easy to track this file You must also specify the size of the key in bits: 1024 is adequate for most certificates, but more secure certificates might require a larger key, such as 2048 bits You should check with your CA to determine what size key it requires.

We could add a property to the Truck to get and set that (modeling a particular coil of hose being connected to the hose system on the truck):

public Hose Hose { get; set; }

This command specifies your file name and the number of bits in its key: openssl genrsa -out wwwexamplecomkey 1024 This command creates the wwwexamplecomkey file in PEM format This is a text-based format, but it s not human readable You can view the file using a text editor; see Listing 9-2 for an example of what a PEM file should look like Listing 9-2 Contents of wwwexamplecomkey -----BEGIN RSA PRIVATE KEY----MIICXQIBAAKBgQC1zCjriMcA7ZlBLj2HlJbjlVmr9whxqabYCSLfPMq0pdmSp0J9 0KVIkAJuaRO+4TCyE+/QqjOt6nxbb0Bnem9RC/NNp2tUGXhu+KAw33GwEjOHAe19 UYc2rVqFk6o2GZyEFn/h2pHvqmzv4hSfxZTcBrjJG0A1 -----END RSA PRIVATE KEY-----.

This is another kind of composition relationship one component of the Truck is a hose, and the truck certainly can t be a part of the hose; but the containing object (the truck) no longer controls the creation and lifetime of its own piece of apparatus. Instead, we say that it aggregates the hose. Of course, there are no hard-and-fast rules about these terms and the code you write; they are just concepts which we use when we are designing systems. The definitions we ve used come from the Unified Modeling Language (UML) 2.0, and we re just mapping them to C# language features.

Nonetheless, it is useful to have a common conceptual language for describing our systems and the common characteristics of the code we use to implement them. Equally, when you are looking at someone else s code (remembering that someone else includes past you ) it is helpful to be able to translate what was written into these standard modeling concepts. So we have a software model of the Firetruck, which has a Ladder and a Hose and uses a Firefighter as its Driver. What about the fire chief The fire chief is just another firefighter. He can drive a truck. He can put out fires. But he can do other stuff too. For instance, he can delegate responsibility for putting out a fire to another firefighter. The question we ask ourselves is this: is the FireChief a Firefighter with extra responsibilities If the answer is yes, we are describing an is-a association (the FireChief is a Firefighter) which we can represent by an inheritance relationship.

We ll get into the nuances of the question in the preceding paragraph in a minute, but let s assume for the time being that our answer to the question is yes (which, on face value, seems reasonable). Example 4-3 shows how we use inheritance in C#.

PEM format is convenient for email, but it s hard to tell whether your file is valid because it is not human readable. You can inspect the key in text format with this command: openssl rsa -noout -text -in www.example.com.key Keys aren t exciting to read, but you should check make sure that you can decode your key successfully; doing this ensures that your file isn t corrupt (see Listing 9-3). Listing 9-3. Text Version of an RSA Key Private-Key: (1024 bit) modulus: 00:b5:cc:28:eb:88:c7:00:ed:99:41:2e:3d:87:94: 96:e3:95:59:ab:f7:08:71:a9:a6:d8:09:22:df:3c: c9:1b:40:35

class FireChief : Firefighter { public void TellFirefighterToExtinguishFire (Firefighter colleague) { colleague.ExtinguishFire(); } }

Notice that we use the colon in the class declaration to indicate that FireChief is a Firefighter. We then say that Firefighter is a base class of FireChief. Looking at the relationship from the other direction, we can also say that FireChief is a derived class of Firefighter. We ve added the extra function that allows the chief to tell a firefighter to extinguish a fire which encapsulates that extra responsibility. What we haven t had to do is to duplicate all the functionality of the firefighter; that comes along anyway. We can now use the fire chief just as we would a firefighter, as shown in Example 4-4.