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The Singleton pattern5 solves the problem of instantiating a class that is reused by multiple clients that don t know about each other. The classical singleton implementation doesn t consider how the class is instantiated or from where it s instantiated. It also doesn t consider how the data of the singleton is exposed. Those issues are delegated, but the implementation of the classical singleton has to be dramatically modified. The reason why you do need to consider threading and a reader-writer is because singletons are nasty from a resource and performance point of view and need more functionality to be useful. Singletons are also nasty because they are so simple to implement. The problem with the Singleton pattern is that the implementation doesn t make a reader aware of the ramifications. In the simplest terms, a singleton is a like a global variable there can only be a single instance. Yet let s think about this: does it mean a single instance per application That isn t entirely correct, because when an application is composed of multiple AppDomains, then it includes multiple singletons. So what does a singleton really mean The answer is that there is no answer because a singleton depends on the scope. For example, it s possible to create a singleton per AppDomain, or a singleton per application, or a singleton per user, or a singleton per computer, or a singleton per group configuration. And yet all of these singletons aren t implemented as many Singleton patterns are implemented today.
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The last activity that can be added directly to a state is another state activity. You may wonder what the ability to nest states gets you; the answer is that it gets you a pretty decent form of event inheritance. EventHandler activities can be defined at the parent state level, and the child states can have those events available as potential targets for a transition. This functionality is not something we re going to look at as part of our simple example here, but take a look at the sidebar Recursive Composition Nesting States for some further exploration of this topic.
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4. Validate client certificate: The server checks that the certificate has not expired, that it has not been tampered with, and that it is issued by a certificate authority that is trusted by the server. It also checks the certificate revocation list (CRL) to see if the certificate is included in the list. The check can be performed online or against a local CRL. The default mode is to check online and this can be modified in the Security tab of the WSE 3.0 Settings Tool. 5. Decrypt the message: After the certificate is validated, the server proceeds to decrypt the message using its private key. 6. Validate the signature: The last step is to validate the client signature using the client public key. This helps the service validate whether the message is coming from the right client and has not been altered while in transit.
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made with multiple FREELISTs. On one hand, use of multiple FREELISTs is a huge performance booster. On the other hand, it will probably cause the table to use slightly more disk space than absolutely necessary. You will have to decide which is less bothersome in your environment. Do not underestimate the usefulness of the FREELISTS parameter, especially since you can alter it up and down at will with Oracle 8.1.6 and later. What you might do is alter it to a large number to perform some load of data in parallel with the conventional path mode of SQL*Loader. You will achieve a high degree of concurrency for the load with minimum waits. After the load, you can reduce the value to some more reasonable day-to-day number. The blocks on the many existing FREELISTs will be merged into the one master FREELIST when you alter the space down. Another way to solve the previously mentioned issue of buffer busy waits is to use an ASSM managed tablespace. If you take the preceding example and create the table T in an ASSM managed tablespace as follows ops$tkyte@ORA11GR2> create tablespace assm 2 datafile size 1m autoextend on next 1m 3 segment space management auto; Tablespace created. ops$tkyte@ORA11GR2> create table t ( x int, y char(50) ) tablespace ASSM; Table created. you ll find the buffer busy waits, CPU time, and elapsed time to have decreased for this case as well, similar to when we configured the perfect number of FREELISTs for a segment using MSSM without having to figure out the optimum number of required FREELISTs: Snapshot Snap Id Snap Time Sessions Curs/Sess Comment ~~~~~~~~ ---------- ------------------ -------- --------- -----------------Begin Snap: 369 17-Mar-10 12:31:05 22 1.5 End Snap: 370 17-Mar-10 12:31:25 24 1.3 Elapsed: 0.33 (mins) Av Act Sess: 4.6 DB time: 1.54 (mins) DB CPU: 1.08 (mins) Top 5 Timed Events Avg %Total ~~~~~~~~~~~~~~~~~~ wait Call Event Waits Time (s) (ms) Time ----------------------------------------- ------------ ----------- ------ -----CPU time 65 58.2 db file async I/O submit 25 17 661 14.9 log file parallel write 674 11 16 9.8 log file switch (checkpoint incomplete) 13 4 334 3.9 buffer busy waits 7,642 4 0 3.4 This is one of ASSM s main purposes: to remove the need to manually determine the correct settings for many key storage parameters. ASSM uses additional space when compared to MSSM in some cases as it attempts to spread inserts out over many blocks, but in most all cases, the nominal extra storage utilized is far outweighed by the decrease in concurrency issues. An environment where storage utilization is crucial and concurrency is not (a data warehouse pops into mind) would not necessarily benefit from ASSM managed storage for that reason.
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Figure 12-4. Client calling the server through a proxy and host
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Filters Per Field setting is turned on, you can only apply one label filter to the Product field.
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Figure 19-9. If a type parameter has multiple constraints, they must be in this order. The following declarations show examples of where clauses: class SortedList<S> where S: IComparable<S> { ... } class LinkedList<M,N> where M : IComparable<M> where N : ICloneable { ... } class MyDictionary<KeyType, ValueType> where KeyType : IEnumerable, new() { ... }
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Furthermore, a process can customize the CLR so that assemblies can be found in and loaded from custom locations. For example, SQL Server 2005 customizes assembly loading. Assemblies implementing managed stored procedures for SQL Server are stored in databases instead of files. As a consequence, you cannot use mixed-code assemblies to implement SQL Server stored procedures only assemblies compiled with /clr:pure or /clr:safe can be used for that purpose. To store a .NET assembly in a SQL Server database, you have to use the SQL DDL command CREATE ASSEMBLY. Once an assembly is installed in the database, static functions of a managed class can be exposed as stored procedures via the CREATE PROCEDURE command. However, for assemblies created with /clr:pure, some additional steps are necessary. Read the accompanying sidebar for the necessary instructions. Mixed-code assemblies cannot be loaded from non-file locations because they must be loaded by the operating system s loader for DLLs and EXEs. This is a requirement for mixedcode assemblies because the OS loader has to prepare the native code in a mixed-code assembly for execution. This preparation implies loading imported DLLs and resolving imported functions from the dependent DLLs. Without these steps, the native code parts of a mixed-code DLL will fail to call another DLL.
Notice the use of the _emptyIsMax flag to determine whether an empty date is to be considered the largest or smallest possible date for comparison purposes. If it is the smallest date, then it is empty if the date value equals DateTime.MinValue; if it is the largest date, it is empty if the value equals DateTime.MaxValue.
It s inside the loop where the real work occurs. The first step is to get a list of all the fields corresponding to the current class: ' get the list of fields in this type fields = currentType.GetFields( _ BindingFlags.NonPublic Or _ BindingFlags.Instance Or _ BindingFlags.Public) It doesn t matter whether the fields are Public they all need to be recorded regardless of scope. What s more important is to only record instance fields, not those declared as Shared. The result of this call is an array of FieldInfo objects, each of which corresponds to a field in the business object.
The following statements create a dynamic type variable and invoke a method upon it: dynamic myDynamicObject = new StringBuilder("Adam");
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