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Each time the client submits a new request, the sequence number is incremented, so all requests have a different sequence number When the server sends a response back to the client, the response contains the sequence number of its request On the client side, matching responses to requests is a simple matter of matching sequence numbers Any pipelining implementation, regardless of whether it uses sequence numbers or not, must be multithreaded, because requests must wait for their respective responses, and those responses can return in arbitrary order The threading details aren t too complicated, especially using an event-based design that uses coordinators to handle the threading..

shortly. Toward the end of this section, we ll compare explicit and implicit caching in terms of features and when to use which technique. Enabling and Disabling Explicit Statement Caching You can enable or disable explicit statement caching by invoking appropriate methods on either the OracleConnection object or the OracleDataSource object from which the Connection object is obtained. To enable explicit statement caching on the OracleConnection object, perform the following steps: 1. Use the Oracle extension method setExplicitCachingEnabled( boolean flag) on the Connection object as follows: conn.setExplicitCachingEnabled( true ); 2. Set the cache size by using the Oracle extension method setStatementCacheSize ( int size) on the Connection object as follows: conn.setStatementCacheSize( 10 ); To enable explicit statement caching on the OracleDataSource object, perform the following steps: 1. Invoke OracleDataSource.getConnection() with the ExplicitCachingEnabled property set to true, or set ExplicitCachingEnabled on the OracleDataSource by calling Oracle DataSource.setExplicitCachingEnabled(true) as follows (assume ods is an initialized variable of type OracleDataSource): ods.setExplicitCachingEnabled( true ); 2. Set the cache size by invoking OracleDataSource.setMaxStatements( int maxNumber OfStatements) as follows (assume ods is an initialized variable of type OracleDataSource): ods.setMaxStatements( 10 ); To determine whether explicit caching is enabled, invoke getExplicitCachingEnabled(), which returns true if explicit caching is enabled and false otherwise. System.out.println("explicit caching enabled: " + conn.getExplicitCachingEnabled() );

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Your mission is to build a component, which I ll call HttpService, that accepts requests from local client applications and forwards them to remote HTTP servers. The traffic between HttpService and the remote servers must consist of HTTP 1.1 requests and responses, using persistent connections. When a client sends multiple requests concurrently to the same remote server, HttpService must pipeline the requests and use a custom Sequence-Number HTTP header to match responses with requests. HttpService must support concurrent requests from multiple clients, as shown in Figure 12-1.

You have monthly insurance policy counts for your regional offices. You d like to see what percentage of the existing policies are in each region, for auto policies and property policies. In your pivot table, Region is in the Row Labels area, PolicyType is in the Column Labels area, and the Sum of Policies field is in the Values area. Status is in the Report Filters area, and Existing is selected (see the table at the left in Figure 3-19). The example shown is from the Policies.xlsx workbook.

Note Remember that you can enable explicit and implicit caching separately you can have either,

Figure 12-1. HttpService supports multiple clients, each sending pipelined requests. Each client must be able to send requests to any arbitrary remote server. Those sent concurrently to the same server must be pipelined. The custom Sequence-Number HTTP header field must carry a value that is different for each request. A request using this header must look something like Listing 12-1. Listing 12-1. A Simple HTTP Request Using the Sequence-Number Header POST /MyPath/MyResource HTTP/1.1 Host: 192.168.0.2:8020 Sequence-Number: 1 Connection: Keep-Alive Content-Length: 9 MyMessage The HTTP request must use the verb POST, followed by a resource path. The code in this case study will ignore the path, but typically you would use the path to indicate what type of request to execute. The last word of the path might be a command code. Per the HTTP spec, all header lines are terminated with a carriage-return/line-feed (CR/LF) combination. The HTTP header ends with a blank line, terminated again with a CR/LF pair, so the header is actually terminated by two CR/LF pairs. The rest of the HTTP request is the message body. The HTTP Content-Length header refers only to the length (in bytes) of the message body. The server returns a response with the same sequence number as the request. Listing 12-2 shows a simple response. Listing 12-2. A Simple HTTP Response Containing the Sequence-Number Header HTTP/1.1 200 OK Sequence-Number: 1 Content-Length: 10 MyResponse

To disable explicit statement caching on a Connection object, use the Oracle extension method setExplicitCachingEnabled( boolean flag) as follows: conn.setExplicitCachingEnabled( false );

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