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The file attribute specifies the file or directory to locate. The type attribute determines whether the file should be a file or directory specifically. The default behavior, without a type attribute, is to indicate success if the file exists as either a file or directory. Checking for the existence of a JVM system resource The final availability check is for a resource, which is any file that can be found on the classpath. This is usually used to check for the availability of configuration files:

Core performance testing across the network Scale-out and scale-up limitations Early capacity planning verification

Executing the command using ExecuteReader sends a query to the database . The results come back by way of an instance of the IDataReader interface . The preceding code stops short of using the results . But take a look at how that works in the following section .

Saving time by skipping unnecessary steps: <uptodate> To determine if target files are up-to-date with source files, Ant provides the <uptodate> task. Most tasks (such as <javac>) deal with source/target out-of-date checking internally, but there are cases where it is necessary to do this yourself. For example, the JUnit test (see chapter 4 for in-depth coverage) task does no dependency checking and simply runs all tests regardless of whether or not any .class files were modified. Skipping the unit test target if all the test related files are up-to-date dramatically improves build time without sacrificing integrated testing:

Once you ve connected to the database and issued a query, you probably need to sift through the data to use it . ADO .NET supports two broad approaches to managing result sets: the IDataReader interface and the DataSet class .

<uptodate property="tests.unnecessary"> <srcfiles dir="src" includes="**/*.java"/> <mapper type="glob" from="*.java" to="${build.dir}/classes/*.class" /> </uptodate>

Multiservices end-to-end integration testing Large cluster of computers or VMs dedicated to running and improving deployment code and validation tests

Deferring the discussion of the <mapper> element for just a moment, this example is setting the property tests.unnecessary to true if each module from the source tree is not newer than its corresponding .class file. (This default is changed by specifying a value attribute.) This example is showing a one-to-one mapping from source file to target file, also ignoring any non-.java files in the source tree. Other scenarios take advantage of many-to-one mappings or other more complex mappings available with the mappers. Combining the use of <uptodate> and conditional targets is a useful technique to allow your build file to handle some dependency checking that tasks do not. 3.12.5 Testing conditions with <condition> For Ant old-timers, the introduction of <condition> in Ant 1.4 was a real treat previously build files that required checking of multiple properties required several dummy targets to accomplish some simple property-based logic. The <condition> task provides property setting capability using logical operators <and>, <or>, and <not>. Within the logical elements, the Boolean conditions shown in table 3.8 are available.

The preceding example retrieves an IDataReader from the query operation . The IDataReader interface is useful for iterating through the results of the query . Listing 10-7 shows part of the IDataReader interface .

Conditions available within <condition> Definition Exactly the same semantics and syntax as the <available> task, except property and value are ignored. Evaluates to true if the resource is available. Exactly the same semantics and syntax as the <uptodate> task, except property and value are ignored. Evaluates to true if file(s) are up-to-date. Evaluates to true if the O/S family (mac, windows, dos, netware, os/2, or unix), name, architecture, and version match. Evaluates to true if both properties have the same value. Evaluates to true if the property exists. Uses the same syntax as the <checksum> task, evaluating to true if the checksum of the file(s) match. Checks for a status code < 500 from a URL. Checks for a socket listener on a specified port and host. Byte-for-byte file comparison between two files. Tests whether one string contains another, optionally case-sensitive. True if the value is on, true, or yes. The negation of <istrue>.

public interface IDataReader { bool IsClosed {get;} int RecordsAffected {get;} void Close(); bool NextResult(); bool Read(); //... }

Integration Testing vs. Test Flags and Emulation As mentioned earlier, services no longer stand alone; they are usually built on platform services and need those services in place to be fully functional. With all these dependencies, the integration points of services must be tested in a manner that allows each service or layer of a service to maintain its own ability to innovate independently. Integration testing and test flags and emulation are techniques to help with this challenge. The selection of the right technique is driven by the degree to which the services are coupled, as shown in Figure 14-7.

<available> <uptodate> <os> <equals> <isset> <checksum> <http> <socket> <filesmatch> <contains> <istrue> <isfalse>