src/jdk/nashorn/internal/runtime/events/RecompilationEvent.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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package jdk.nashorn.internal.runtime.events;

import java.util.logging.Level;
import jdk.nashorn.internal.runtime.Context;
import jdk.nashorn.internal.runtime.RecompilableScriptFunctionData;
import jdk.nashorn.internal.runtime.RewriteException;

/**
 * Subclass of runtime event for {@link RewriteException}. In order not
 * to leak memory, RewriteExceptions get their return value destroyed
 * and nulled out during recompilation. If we are running with event
 * logging enabled, we need to retain the returnValue, hence the extra
 * field
 */
public final class RecompilationEvent extends RuntimeEvent<RewriteException> {

    private final Object returnValue;

    /**
     * Constructor
     *
     * @param level            logging level
     * @param rewriteException rewriteException wrapped by this RuntimEvent
     * @param returnValue      rewriteException return value - as we don't want to make
     *     {@code RewriteException.getReturnValueNonDestructive()} public, we pass it as
     *     an extra parameter, rather than querying the getter from another package.
     */
    public RecompilationEvent(final Level level, final RewriteException rewriteException, final Object returnValue) {
        super(level, rewriteException);
        assert Context.getContext().getLogger(RecompilableScriptFunctionData.class).isEnabled() :
            "Unit test/instrumentation purpose only: RecompilationEvent instances should not be created without '--log=recompile', or we will leak memory in the general case";
        this.returnValue = returnValue;
    }

    /**
     * Get the preserved return value for the RewriteException
     * @return return value
     */
    public Object getReturnValue() {
        return returnValue;
    }
}