本文整理汇总了Java中sun.tracing.NullProviderFactory类的典型用法代码示例。如果您正苦于以下问题：Java NullProviderFactory类的具体用法？Java NullProviderFactory怎么用？Java NullProviderFactory使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
NullProviderFactory类属于sun.tracing包，在下文中一共展示了NullProviderFactory类的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: getDefaultFactory
import sun.tracing.NullProviderFactory; //导入依赖的package包/类
/**
* Returns an implementation of a {@code ProviderFactory} which
* creates instances of Providers.
*
* The created Provider instances will be linked to all appropriate
* and enabled system-defined tracing mechanisms in the JDK.
*
* @return a {@code ProviderFactory} that is used to create Providers.
*/
public static ProviderFactory getDefaultFactory() {
HashSet<ProviderFactory> factories = new HashSet<ProviderFactory>();
// Try to instantiate a DTraceProviderFactory
String prop = AccessController.doPrivileged(
new GetPropertyAction("com.sun.tracing.dtrace"));
if ( (prop == null || !prop.equals("disable")) &&
DTraceProviderFactory.isSupported() ) {
factories.add(new DTraceProviderFactory());
}
// Try to instantiate an output stream factory
prop = AccessController.doPrivileged(
new GetPropertyAction("sun.tracing.stream"));
if (prop != null) {
for (String spec : prop.split(",")) {
PrintStream ps = getPrintStreamFromSpec(spec);
if (ps != null) {
factories.add(new PrintStreamProviderFactory(ps));
}
}
}
// See how many factories we instantiated, and return an appropriate
// factory that encapsulates that.
if (factories.size() == 0) {
return new NullProviderFactory();
} else if (factories.size() == 1) {
return factories.toArray(new ProviderFactory[1])[0];
} else {
return new MultiplexProviderFactory(factories);
}
}