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improve the caching of parsed class files

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This commit is contained in:
Volker Berlin 2020-01-07 19:54:05 +01:00
parent 3dbca800bb
commit 8d37faa81d
2 changed files with 35 additions and 0 deletions
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34
src/de/inetsoftware/jwebassembly/module/ClassFileLoader.java
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@ -20,6 +20,7 @@ import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import de.inetsoftware.classparser.ClassFile;
@ -38,6 +39,8 @@ public class ClassFileLoader {
private final ClassLoader loader;
private final ClassLoader bootLoader;
/**
* Create a new instance
*
@ -46,6 +49,15 @@ public class ClassFileLoader {
*/
public ClassFileLoader( ClassLoader loader ) {
this.loader = loader;
ClassLoader cl = ClassLoader.getSystemClassLoader();
do {
ClassLoader parent = cl.getParent();
if( parent == null ) {
bootLoader = cl;
break;
}
cl = parent;
} while( true );
}
/**
@ -65,16 +77,38 @@ public class ClassFileLoader {
}
classFile = weakCache.get( className );
if( classFile != null ) {
if( "java/lang/String".equals( className ) ) {
System.err.println( className + " from cache" );
}
return classFile;
}
InputStream stream = loader.getResourceAsStream( className + ".class" );
if( stream != null ) {
if( "java/lang/String".equals( className ) ) {
System.err.println( className + " from URL " + loader.getResource( className + ".class" ) );
}
classFile = new ClassFile( stream );
weakCache.put( className, classFile );
}
return classFile;
}
/**
* Add a class file to the weak cache.
*
* @param classFile
* the class file
*/
public void cache( @Nonnull ClassFile classFile ) {
String name = classFile.getThisClass().getName();
if( bootLoader.getResource( name + ".class" ) != null ) {
// if the same resource is exist in the JVM self then we need to hold the reference permanently
replace.put( name, classFile );
} else {
weakCache.put( name, classFile );
}
}
/**
* Replace the class in the cache with the given instance.
*

1
src/de/inetsoftware/jwebassembly/module/ModuleGenerator.java
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@ -162,6 +162,7 @@ public class ModuleGenerator {
* if any I/O error occur
*/
public void prepare( ClassFile classFile ) throws IOException {
classFileLoader.cache( classFile );
// check if this class replace another class
Map<String,Object> annotationValues;
if( (annotationValues = classFile.getAnnotation( JWebAssembly.REPLACE_ANNOTATION )) != null ) {