The java™ native interface

... lays out objects in a way other than that assumed by the native method interface, then you have to recompile the native method libraries • Second, the native method interface in JDK release 1.0 ... that they conform to the JNI standard The JNI is the native interface supported by all Java virtual machine implementations From JDK release 1.1 on, you should program to...

Ngày tải lên: 27/06/2014, 08:20

... 10 9 11 3 11 6 11 6 11 7 11 7 11 8 12 3 12 4 12 5 12 7 10 Traps and Pitfalls 13 1 10 .1 10.2 10 .3 10 .4 10 .5 10 .6 10 .7 10 .8 Error Checking ... 11 .8.2 Java Virtual Machine Exceptions 11 .8.3 Asynchronous Exceptions 14 5 14 6 14 6 14 7 14 8 15 0 15 1 15 1 15 3 15 3 15 3 15 5 15 5 15 6 15 7 15 8 15 8 15 8 ... 14 5 11 .1 11. 2 11 .3 11 ....

Ngày tải lên: 13/08/2014, 08:20

... however, is hidden from the programmer The native code must manipulate the underlying objects via the 23 Simpo PDF MergeFebruary 21 , 20 02 4:36 PM jni.book Page 24 Thursday, and Split Unregistered ... sets the instance field, and then calls the native method InstanceFieldAccess.accessField As we will see shortly, the native method prints out the existing value o...

Ngày tải lên: 13/08/2014, 08:20

... by comparing the cost of Java/ native calls with the cost of Java/ Java calls Java/ native calls are potentially slower than Java/ Java calls for the following reasons: • Native methods most likely ... class reference and the other for the result returned from the method call Next, it obtains the class reference from the object and looks up the method ID Depe...

Ngày tải lên: 13/08/2014, 08:20

... Page 1 04 Thursday, and 21, 2002 4: 36 PM 8 .4. 2 The JNI_OnUnload Handler ADDITIONAL JNI FEATURES 8 .4. 2 The JNI_OnUnload Handler Intuitively, the virtual machine calls the JNI_OnUnload handler when ... System.loadLibrary loads the native library, the other to be called when the virtual machine unloads the native library This feature was added in Java SDK release 1...

Ngày tải lên: 13/08/2014, 08:20

... in the Java Platform LEVERAGING EXISTING NATIVE LIBRARIES 9 .5. 1 Peer Classes in the Java Platform The current JDK and Java SDK releases (1.1 and 1.2) use peer classes internally to implement the ... Application and Native Code A common question when designing a Java application supported by native code is “What, and how much, should be in native code?” The...

Ngày tải lên: 13/08/2014, 08:20

... http://www.simpopdf.com jni.book Page 152 Thursday, and 21, 2002 4: 36 PM 11.3 Linking Native Methods OVERVIEW OF THE JNI DESIGN The virtual machine deduces the name of the native function from the name of the ... once in the user code and then again in the library 161 Simpo PDF Merge FebruarySplit Unregistered Version - http://www.simpopdf.com jni.book Page 162 Thu...

Ngày tải lên: 13/08/2014, 08:20

... exception stays thrown until either the native code calls ExceptionClear, or the caller of the native method handles the exception The difference between this function and ExceptionOccurred is that ... are to be passed to the method immediately following the methodID argument The CallStaticMethod routine accepts these arguments and passes them to the static method th...

Ngày tải lên: 13/08/2014, 08:20

... represents any class other than the class java. lang.Object, then this function returns a reference to the superclass of the class specified by clazz If clazz represents the class java. lang.Object, ... the JNIEnv interface version required by the native library System.loadLibrary triggers the execution The JNI_OnLoad function returns the JNI of this function version numb...

Ngày tải lên: 13/08/2014, 08:20

... java. lang.reflect.Constructor, 105 , 217 java. lang.reflect.Field, 105 , 216 java. lang.reflect.Method, 105 , 217 java. lang.String See String java. lang.Thread, 48 property, 17, 150 java. library.path Java/ Java call, 58 Java/ native ... API, 270 java. class.path property, 85 java. io.FileDescriptor, 124 java. lang.Class, 202 java. lang.ClassLoader, 202 java. lang.Float, 1...

Ngày tải lên: 13/08/2014, 08:20

... leaks The Java side The first step in using the JNI is to create a Java file that will call our native C code Create a Java file called Hello .java with the following contents: //File: Hello .java ... sayHello() is called The fact that the method is native is irrelevant to the caller Simply compile Hello .java as you would for any other Java source file (using...

Ngày tải lên: 10/03/2015, 10:56

... the IDL and their resulting Java representation Type long short float double char Table 6-2 IDL Types and their Java Representations Java Mapping Java int Java short Java float Java double Java ... implement your objects in any language for which a language mapping exists Interfaces Interfaces are the backbone of the IDL In an object-oriented language, you can cre...

Ngày tải lên: 29/09/2013, 08:20

... for the smallest block that will satisfy the request If the block is exactly the size requested it is unlinked from the list and returned to the user If the block is too big, it is split, and the ... machines, the most restrictive type is a double; on others, int or long suffices A free block contains a pointer to the next block in the chain, a record of the size of t...

Ngày tải lên: 30/09/2013, 06:20

... 7/13/04 12:43 PM Page xviii Introduction readers that they familiarize themselves with the following chapter guide so that they can quickly refer to the subjects they are interested in We have ... the source code for the book’s examples on the Apress web site (www.apress.com), on the Downloads page Chapter 1: Introduction to Portals and Portlets This chapter outlines the...

Ngày tải lên: 05/10/2013, 04:20