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When you enable the throttle module, you ll notice that an extra series of check boxes appears on the module administration page. That is, in addition to selecting whether a module is enabled, you can also select whether it will be throttled. Being throttled means that when module_list() returns a list of which modules are enabled and the throttle is on because of high traffic, that module will not be included; throttled modules are effectively disabled. Obviously, you ll need to carefully choose which modules you wish to throttle. Good candidates are modules that do something nonessential but take up CPU time or perform many database queries. Core modules cannot be throttled (because they re necessary for Drupal to run correctly) but may understand throttling and offer their own options for reducing processing time when the site is being throttled. For example, the block module cannot be throttled, but individual blocks can be throttled, as shown in Figure 22-2.

public interface ProjectDao { // Projects @Transactional(readOnly=true, propagation=Propagation.SUPPORTS) List<Projects> getProjects();

Figure 22-2. When under a heavy load, this site will not display the search form in the header or the Who s new and Who s online blocks in the right sidebar, but it will always display the Navigation and User login blocks in the left sidebar and the Powered by Drupal block in the footer.

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Direct rendering of images has many uses, but in some cases it is beneficial to use an image as a background tile, similar to the capability available in CSS. We ve already seen how it is possible to set a stroke or fill style to be a solid color. The HTML5 Canvas API also includes an option to set an image as a repeatable pattern for either a path stroke or fill. To make our forest trail appear a bit more rugged, we will demonstrate the capability by replacing the previous stroked trail curve with one that uses a background image fill. In doing so, we ll swap out our now-unused bark image for a gravel image that we will put to use here. Listing 2-18 shows we replace the call to drawImage with a call to createPattern.

In order for the throttle mechanism to kick in, you ll have to give it a threshold and a sampling frequency. When the throttle module is enabled, the thresholds can be set at Administer Site configuration Throttle. Setting Thresholds Two thresholds can be entered: the number of anonymous users at which throttling will begin and the number of authenticated users at which throttling will begin. Since anonymous users take fewer resources than authenticated users, the threshold for anonymous users should be higher. The actual values will depend on your individual site. The number of users must be measured against a given time period. This time period is set in the Who s online block settings and stored as the Drupal variable user_block_ seconds_online. If it has not been set, it defaults to 900 seconds (15 minutes), as shown in Figure 22-3.

@Transactional(readOnly=false, propagation=Propagation.REQUIRED) Projects insertProject(Projects project); @Transactional(readOnly=false, propagation=Propagation.REQUIRED) void deleteProject(Projects project); @Transactional(readOnly=true, propagation=Propagation.REQUIRED) void updateProject(Projects project); // Project Tasks @Transactional(readOnly=true, propagation=Propagation.SUPPORTS) List<ProjectTasks> getProjectTasks(); @Transactional(readOnly=false, propagation=Propagation.REQUIRED) ProjectTasks insertProjectTask(ProjectTasks projectTasks); @Transactional(readOnly=false, propagation=Propagation.REQUIRED) void deleteProjectTask(ProjectTasks projectTasks); @Transactional(readOnly=true, propagation=Propagation.REQUIRED) void updateProjectTask(ProjectTasks projectTasks); // Project Risks @Transactional(readOnly=true, propagation=Propagation.SUPPORTS) List<ProjectRisks> getProjectRisks(); @Transactional(readOnly=false, propagation=Propagation.REQUIRED) ProjectRisks insertProjectRisk(ProjectRisks projectRisks); @Transactional(readOnly=false, propagation=Propagation.REQUIRED) void deleteProjectRisk(ProjectRisks projectRisks); @Transactional(readOnly=true, propagation=Propagation.REQUIRED) void updateProjectRisk(ProjectRisks projectRisks); // Issues @Transactional(readOnly=true, propagation=Propagation.SUPPORTS) List<Issues> getIssues(); @Transactional(readOnly=false, propagation=Propagation.REQUIRED) Issues insertIssue(Issues issue); @Transactional(readOnly=false, propagation=Propagation.REQUIRED) void deleteIssue(Issues issue); @Transactional(readOnly=true, propagation=Propagation.REQUIRED) void updateIssue(Issues issue); }

Figure 22-3. The time period after a user s last visit during which a user is still considered online is determined by the User activity field in the Who s online block settings. Setting Sampling Frequency To determine the load on the site to see if the throttle mechanism should be on or off, the throttle module must query the database. This puts additional load on the database server. The frequency of these checks (actually the probability that a check will occur on a given request) is set using the Auto-throttle probability limiter setting. For example, choosing the value 20 percent would sample on about 1 out of every 5 requests.

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