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package org.glassfish.api;

import org.jvnet.hk2.annotations.Contract;

import java.util.Hashtable;

/** Third party tool vendors may implement this interface to provide code
 * instrumentation to the application server.
 */
@Contract
public interface BytecodePreprocessor {
    
    /** Initialize the profiler instance.  This method should be called exactly 
     * once before any calls to preprocess.
     * @param parameters Initialization parameters.
     * @return true if initialization succeeded.
     */    
    public boolean initialize(Hashtable parameters);
    
    /** This function profiler-enables the given class.  This method should not 
     * be called until the initialization method has completed.  It is thread-
     * safe.
     * @param classname The name of the class to process.  Used for efficient 
     * filtering.
     * @param classBytes Actual contents of class to process
     * @return The instrumented class bytes.
     */    
    public byte[] preprocess(String classname, byte[] classBytes);
    
}