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All of the public classes, built-in or otherwise, in the hierarchy are listed in almanac form in the appendix
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The memory footprint of TINI s Java Virtual Machine (JVM) is less than 40 kilobytes Despite its small size, it supports much of the functionality provided by full JVM implementations, including the following Full support for threads Support for all primitive types Strings
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However, there are also important omissions such as these Dynamic class loading Object nalization5
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Stating that the JVM doesn t support the dynamic loading of class les may leave the impression the methods ClassforName and ClassnewInstance are not supported In fact, both are implemented along with several other methods de ned in class Class Many of the classes in the API rely on this capability for several tasks, including creating character-to-byte converters and loading 1-Wire chip containers However, if a thread of execution invokes forName and passes it a String specifying a class that does not exist in either the built-in API or the currently executing application, forName will throw a ClassNotFoundException rather than loading the speci ed class into the current application s binary image Class loading is effectively split into two phases The rst is performed by a convertor utility (TINIConvertor which is described in the next chapter) on a host development machine The convertor performs complete constant pool 6 resolution of all of the classes used by an application Application classes may reference methods and elds in other classes in the application or in the built-in API The output of this conversion process is a binary image that can be directly executed by TINI s JVM Any unresolvable constant pool entry results in the convertor aborting before generating an executable image The second phase of the class loading process, running the class initializer methods, takes place on TINI When a new Java application is launched, all of the class initializer methods are run for the classes in the API, followed by all of the application s class initializer methods The net effect of this split class loading model is that an application, by default, has loaded all of the classes de ned in the built-in API as well as application speci c classes This
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5 An object s finalize method can be explicitly invoked by a Java thread of execution but is not automatically run before it is reclaimed by the garbage collector 6 Every class le contains an area known as the constant pool that contains symbolic information required by the class during runtime execution, such as references to elds, methods, and classes
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doesn t increase the footprint of the application s binary image because converted images of the built-in API classes are stored separately in the ash memory as part of the runtime environment Besides the preceding functional omissions, there are also hard limits on certain resources, such as a maximum of 16 actively executing threads These limits are documented in a le named Limitationstxt distributed with TINI s SDK documentation As the platform evolves, the majority of these limits will disappear
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The native layer, shown in Figure 15, represents the collection of native methods that support the API by exposing the infrastructure provided by TINI OS This includes access to the network protocol stack s socket layer as well as nonnetworking device drivers It also includes methods for con guring and accessing system resources such as the watchdog timer and real-time clock Between the actual native method implementations and interpreted Java code is a very thin layer known as the native method interface The native method interface is a boundary that must be crossed to switch execution contexts between code being executed by the JVM and a native method TINI s native method interface (TNI) provides a very lightweight mechanism to cross this boundary Its analog on most other Java platforms is the Java Native Interface (JNI) TNI is much lighter weight, and therefore less exible, than JNI Because the majority of TINI applications can be written entirely in Java, the details of TINI s native interface are unimportant to most developers The only thing that matters is that the context switching overhead incurred when invoking the runtime environment s native methods is as low as possible Applications that require custom native methods can provide a native library that can be loaded into the system at runtime using the loadLibrary7 method de ned in the class javalangRuntime
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public static void loadLibrary(String libname)
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where the libname parameter speci es the le name of the native library The details of writing native libraries are beyond the scope of this text A pair of documents named Native_Methodstxt and Native_APItxt are included in the TINI SDK distribution, and they describe the process of writing and building native libraries
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