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restructured corecomm to throw exceptions instead of returning success of operation

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This commit is contained in:
fros4943 2007-05-11 10:15:42 +00:00
parent 80ec85abad
commit ca6b1d4bf8
1 changed files with 73 additions and 51 deletions
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102
tools/cooja/java/se/sics/cooja/CoreComm.java
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@ -24,7 +24,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: CoreComm.java,v 1.9 2007/05/11 10:02:13 fros4943 Exp $
* $Id: CoreComm.java,v 1.10 2007/05/11 10:15:42 fros4943 Exp $
*/
package se.sics.cooja;
@ -39,18 +39,19 @@ import se.sics.cooja.dialogs.MessageList;
/**
* The purpose of corecomm's is communicating with a compiled Contiki system
* using Java Native Interface (JNI). Each implemented class (named Lib[number]),
* loads a shared library which belongs to one mote type. The reason for this
* somewhat strange design is that once loaded, a native library cannot be
* unloaded in Java (in the current versions available). Therefore if we wish to
* load several libraries, the names and associated native functions must have
* unique names. And those names are defined via the calling class in JNI. For
* example, the corresponding function for a native tick method in class Lib1
* will be named Java_se_sics_cooja_corecomm_Lib1_tick. When creating a new mote
* type, the main Contiki source file is generated with function names
* compatible with the next available corecomm class. This also implies that
* even if a mote type is deleted, a new one cannot be created using the same
* corecomm class without restarting the JVM and thus the entire simulation.
* using Java Native Interface (JNI). Each implemented class (named
* Lib[number]), loads a shared library which belongs to one mote type. The
* reason for this somewhat strange design is that once loaded, a native library
* cannot be unloaded in Java (in the current versions available). Therefore if
* we wish to load several libraries, the names and associated native functions
* must have unique names. And those names are defined via the calling class in
* JNI. For example, the corresponding function for a native tick method in
* class Lib1 will be named Java_se_sics_cooja_corecomm_Lib1_tick. When creating
* a new mote type, the main Contiki source file is generated with function
* names compatible with the next available corecomm class. This also implies
* that even if a mote type is deleted, a new one cannot be created using the
* same corecomm class without restarting the JVM and thus the entire
* simulation.
*
* Each implemented CoreComm class needs read access to the following core
* variables:
@ -71,7 +72,9 @@ public abstract class CoreComm {
// Static pointers to current libraries
private final static Vector<CoreComm> coreComms = new Vector<CoreComm>();
private final static Vector<File> coreCommFiles = new Vector<File>();
private static int fileCounter = 1;
/**
@ -97,7 +100,8 @@ public abstract class CoreComm {
*/
public static boolean hasLibraryFileBeenLoaded(File libraryFile) {
for (File loadedFile : coreCommFiles)
if (loadedFile != null && loadedFile.getName().equals(libraryFile.getName()))
if (loadedFile != null
&& loadedFile.getName().equals(libraryFile.getName()))
return true;
return false;
}
@ -117,10 +121,12 @@ public abstract class CoreComm {
* the class name field.
*
* @param className
* Wanted class name
* @return True if success, false otherwise
* Java class name (without extension)
* @throws MoteTypeCreationException
* If error occurs
*/
public static boolean generateLibSourceFile(String className) {
public static void generateLibSourceFile(String className)
throws MoteTypeCreationException {
BufferedWriter sourceFileWriter = null;
BufferedReader templateFileReader = null;
String destFilename = null;
@ -167,24 +173,28 @@ public abstract class CoreComm {
if (templateFileReader != null)
templateFileReader.close();
} catch (Exception e2) {
return false;
}
return false;
throw (MoteTypeCreationException) new MoteTypeCreationException(
"Could not generate corecomm source file: " + className + ".java")
.initCause(e);
}
File genFile = new File("se/sics/cooja/corecomm/" + destFilename);
if (genFile.exists())
return true;
return;
return false;
throw (MoteTypeCreationException) new MoteTypeCreationException(
"Could not generate corecomm source file: " + className + ".java");
}
/**
* Compiles Java class.
*
* @param className Java class name (without extension)
* @throws MoteTypeCreationException If Java class compilation error occurrs
* @param className
* Java class name (without extension)
* @throws MoteTypeCreationException
* If Java class compilation error occurs
*/
private static void compileSourceFile(String className)
throws MoteTypeCreationException {
@ -260,23 +270,36 @@ public abstract class CoreComm {
}
/**
* Load given Java class file, making it ready to be used.
* Loads given Java class file from disk.
*
* @param classFile Class file
* @return Loaded class, or null
* @param classFile
* Java class (without extension)
* @return Loaded class
* @throws MoteTypeCreationException
* If error occurs
*/
private static Class loadClassFile(String className) {
private static Class loadClassFile(String className)
throws MoteTypeCreationException {
Class loadedClass = null;
try {
ClassLoader urlClassLoader = new URLClassLoader(
new URL[] { new File(".").toURL() },
CoreComm.class.getClassLoader());
loadedClass = urlClassLoader.loadClass("se.sics.cooja.corecomm." + className);
ClassLoader urlClassLoader = new URLClassLoader(new URL[] { new File(".")
.toURL() }, CoreComm.class.getClassLoader());
loadedClass = urlClassLoader.loadClass("se.sics.cooja.corecomm."
+ className);
} catch (MalformedURLException e) {
return null;
throw (MoteTypeCreationException) new MoteTypeCreationException(
"Could not load corecomm class file: " + className + ".class")
.initCause(e);
} catch (ClassNotFoundException e) {
return null;
throw (MoteTypeCreationException) new MoteTypeCreationException(
"Could not load corecomm class file: " + className + ".class")
.initCause(e);
}
if (loadedClass == null)
throw (MoteTypeCreationException) new MoteTypeCreationException(
"Could not load corecomm class file: " + className + ".class");
return loadedClass;
}
@ -292,18 +315,17 @@ public abstract class CoreComm {
*/
public static CoreComm createCoreComm(String className, File libFile)
throws MoteTypeCreationException {
if (!generateLibSourceFile(className))
throw new MoteTypeCreationException("Could not generate corecomm source file: " + className + ".java");
generateLibSourceFile(className);
compileSourceFile(className);
Class newCoreCommClass = loadClassFile(className);
if (newCoreCommClass == null)
throw new MoteTypeCreationException("Could not load corecomm class file: " + className + ".class");
try {
Constructor constr = newCoreCommClass.getConstructor(new Class[] { File.class });
CoreComm newCoreComm = (CoreComm) constr.newInstance(new Object[] { libFile });
Constructor constr = newCoreCommClass
.getConstructor(new Class[] { File.class });
CoreComm newCoreComm = (CoreComm) constr
.newInstance(new Object[] { libFile });
coreComms.add(newCoreComm);
coreCommFiles.add(libFile);
@ -312,7 +334,7 @@ public abstract class CoreComm {
return newCoreComm;
} catch (Exception e) {
throw (MoteTypeCreationException) new MoteTypeCreationException(
"Error when creating library instance: " + className).initCause(e);
"Error when creating corecomm instance: " + className).initCause(e);
}
}