.NET/ASP.NET/C#/VB.NET PDF Document SDK

Now you can use the regasm.exe tool to register the hwfs.dll assembly as a COM component: C:\ > regasm hwfs.dll Microsoft (R) .NET Framework Assembly Registration Utility 2.0.50727.312 Copyright (C) Microsoft Corporation 1998-2004. All rights reserved. Types registered successfully Now you have to write the script using the Jscript language to test the component; the script will use the CreateObject method to create an instance of the F# object type, with the CCW generated by the CLR taking care of all the interoperability issues. But what is the ProgID of the COM component You use regasm.exe with the /regfile switch to generate a registry file containing the keys corresponding to the registration of the COM component instead of performing it. The generated registry file contains the following component registration (we ve included only the most relevant entries): [HKEY_CLASSES_ROOT\Hwfs+FSCOMComponent] @="Hwfs+FSCOMComponent" [HKEY_CLASSES_ROOT\Hwfs+FSCOMComponent\CLSID] @="{41BFA014-8389-3855-BD34-81D8933045BF}" [HKEY_CLASSES_ROOT\CLSID\{41BFA014-8389-3855-BD34-81D8933045BF}] @="Hwfs+FSCOMComponent" [HKEY_CLASSES_ROOT\CLSID\{41BFA014-8389-3855-BD34-81D8933045BF}\InprocServer32] @="mscoree.dll" "ThreadingModel"="Both" "Class"="Hwfs+FSCOMComponent" "Assembly"="hwfs, Version=0.0.0.0, Culture=neutral, PublicKeyToken=97db6c0b1207bed4" "RuntimeVersion"="v2.0.50727" The InprocServer32 subkey indicates that the COM component is implemented by mscoree.dll, which is the CLR, and the additional attributes indicate the assembly that should be run by the runtime. Note that the ProgID and the class name of the component is Hwfs+FSCOMComponent, which is partly derived from the namespace Hwfs generated by the F# compiler. You can now try to write the following script in the hwfs.js file: o = WScript.CreateObject("Hwfs+FSCOMComponent"); WScript.Echo(o.HelloWorld()); If you execute the script (here using the command-based host cscript), you obtain the expected output:

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This is why Oracle asks you to specify the HASHKEYs (how many department numbers you anticipate over time) and SIZE (what the size of the data is that will be associated with each department number) It allocates a hash table to hold HASHKEY number of departments of SIZE bytes each What you do want to avoid is unintended hash collisions It is obvious that if you set the size of the hash table to 1,000 (really 1,009, since the hash table size is always a prime number and Oracle rounds up for you), and you put 1,010 departments in the table, there will be at least one collision (two different departments hashing to the same value) Unintended hash collisions are to be avoided, as they add overhead and increase the probability of block chaining occurring.

To see what sort of space hash clusters take, we ll use a small utility stored procedure SHOW_SPACE (for details on this procedure, see the Setting Up Your Environment section at the beginning of the book) that we ll use in this chapter and in the next chapter This routine just uses the DBMS_SPACEsupplied package to get details about the storage used by segments in the database Now, if we issue a CREATE CLUSTER statement, such as the following, we can see the storage it allocated: ops$tkyte%ORA11GR2> create cluster hash_cluster 2 ( hash_key number ) 3 hashkeys 1000 4 size 8192.

C:\ > cscript foo.js Microsoft (R) Windows Script Host Version 5.7 Copyright (C) Microsoft Corporation. All rights reserved. Hello world from F#! But how can you obtain a ProgID with dot-notation instead of the ugly plus sign So far, you have used only the basic features of the COM interoperability, but a number of custom attributes can give you finer control over the CCW generation. These attributes are defined in the System.Runtime.InteropServices namespace; and among these classes you ll find the ProgIdAttribute class whose name hints that it is somewhat related to the ProgID. In fact, you can annotate your F# object type using this attribute: open System open System.Runtime.InteropServices [<ProgId("Hwfs.FSComponent")>] type FSCOMComponent = new() as x = {} member x.HelloWorld() = "Hello world from F#!" First unregister the previous component: C:\> regasm hwfs.dll /unregister Microsoft (R) .NET Framework Assembly Registration Utility 2.0.50727.312 Copyright (C) Microsoft Corporation 1998-2004. All rights reserved. Types un-registered successfully C:\> gacutil /u hwfs Microsoft (R) .NET Global Assembly Cache Utility. Version 2.0.50727.42 Copyright (c) Microsoft Corporation. All rights reserved. Assembly: hwfs, Version=0.0.0.0, Culture=neutral, PublicKeyToken=8c1f06f522fc70f8, processorArchitecture=MSIL Uninstalled: hwfs, Version=0.0.0.0, Culture=neutral, PublicKeyToken=8c1f06f522fc70f8, processorArchitecture=MSIL Number of assemblies uninstalled = 1 Number of failures = 0 Now you can update the script as follows and register everything again after recompiling the F# file: o = WScript.CreateObject("Hwfs.FSComponent"); WScript.Echo(o.HelloWorld()); Using other attributes, it is possible to specify the GUIDs to be used and several other aspects that are important in some situations. When a system expects a component implementing a