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Now, to embed an applet using the <object> element is anything but easy. Assuming that your Applet class is MyA.class and that it is archived together with all other necessary classes in a JAR file named MyA.jar, with the now deprecated <applet> element you might have included in your HTML document something like the following line: <applet code="MyA" archive="MyA.jar" height="200" width="300"></applet> With strict XHTML, you have to include the following to be sure that both Internet Explorer and Firefox can render the page correctly: <!--[if !IE]>--> <object classid="java:MyA.class" codetype="application/x-java-applet" archive="MyA.jar" height="200" width="300"> <!--<![endif]--> <object classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93" height="200" width="300"> <param name="code" value="MyA"/> <param name="archive" value="MyA.jar"/> </object> <!--[if !IE]>--> </object> <!--<![endif]--> Just to make it safer, you should also tell the browser where the Java plug-in can be found on the Sun server. To do it, include the following attribute inside the innermost <object> start tag: codebase="http://java.sun.com/update/1.5.0/jinstall-1_5_0-windows-i586.cab" This refers to Java 5, which was the latest version at the time of writing this chapter. Obviously, you don t need it if the plug-in has already been installed. If, by any chance, you re using the Konqueror browser, insert the following line between the first <object> start tag and the line containing the first endif: <param name="archive" value="MyA.jar"/> With <param>, you can define the applet parameters, as in the following example: <param name="theParName" value="the ParValue"/> Unfortunately, because of the <object> duplication necessary to cater for all browsers, the parameters have to be duplicated as well. So this code: <applet code="MyA" archive="MyA.jar" height="200" width="300"> <param name="aName" value="whatever"/> <param name="anotherName" value="blabla"/> </applet>

We have discussed using signals and children to control the execution of background jobs, but there is a third technique as well, one that allows you to change the relative priority of a background process. Each Unix process has a nice value that informs the kernel as to the priority of that process s execution. The higher the nice value, the more ready a process is to move out of the way and free resources for other processes when the system is busy. The range of values is from 20 (highest priority, lowest niceness) to 20 (lowest priority, highest niceness). The nice value sent to the operating system by a PHP script can be increased (but unless it is running as the root user it cannot be decreased) from the default value of 0 using the proc_nice() function (see http://php.net/proc_nice for more information). In general, web applications should never reprioritize themselves, but background batch jobs such as the ones we re dealing with in this chapter are likely candidates for it. CPU-intensive batch jobs can ensure that they don t hog system resources by setting their nice values to 20.

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So, how do you parse the XHTML code in the custom component Create box.xhtml (in the META-INF folder) with the content shown in Figure 5 11. Simply put, the <ui:insert> tag will trace back into the body of the custom tag in the calling page to build the compo nent tree.

now becomes: <!--[if !IE]>--> <object classid="java:MyAclass" codetype="application/x-java-applet" archive="MyAjar" height="200" width="300"> <param name="aName" value="whatever"/> <param name="anotherName" value="blabla"/> <!--<![endif]--> <object classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93" height="200" width="300"> <param name="code" value="MyA"/> <param name="archive" value="MyAjar"/> <param name="aName" value="whatever"/> <param name="anotherName" value="blabla"/> </object> <!--[if !IE]>--> </object> <!--<![endif]--> To top it off, while using <applet> to define the URL holding the JAR file, you only needed to define the codebase attribute, as in codebase="myApplets" Now, however, you have to pass it to the object as a <param>, as in <param name="codebase" value="myApplets"/> And obviously, you need to do it twice, once for each one of the two objects Perhaps you re thinking of switching back from strict to transitional validation, so that you can keep using <applet> You have our sympathy, but resist the temptation, because in the future, you might no longer be able to do it, and it is healthy to be rigorous.

Now that we have looked at some of the specific things that you can do to execute root-level and resource-intensive operations safely, we present some general implementation strategies to help you meet those objectives. The common factor in handling both types of unsafe actions is to separate them from your online application and run them in the background. The purpose of moving them to the background is quite different for the two different kinds of dangers. For root-level operations, the intermediary step ensures that the requested operation is not inappropriate. For resource-intensive operations, it ensures that sufficient resources are available now to carry out the operation without unduly affecting the efficiency of your server. The API we proposed earlier for handling root-level operations is capable of handling root-level operations safely. Handling resource-intensive operations is a good deal more complicated, however, and so we turn to that now. Managing a queue of possibly delayed resource-intensive jobs is much more complex than handling root-level operations, and therefore exposes your server and your users data to avoidable risks. We turn to that task now, concentrating on three different problems: How to build a queue of jobs so that they are not executed in an unsafe manner How to trigger batch-processing scripts so that they can be executed safely by the batch processor How a web application can track the status of a background job and pick up the results when complete

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