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package org.javasimon.javaee;

import org.javasimon.Manager;
import org.javasimon.source.AbstractMethodStopwatchSource;

import javax.interceptor.InvocationContext;
import java.lang.reflect.Method;

/**
 * Provide stopwatch source for EJB and CDI invocation context.
 * Used by {@link SimonInterceptor} as default stopwatch source.
 * Can be overridden to customize monitored EJB methods and their
 * related Simon name.
 * @author gquintana
 */
public class MethodStopwatchSource extends AbstractMethodStopwatchSource {
	/**
	 * Default prefix for Simon names
	 */
	public static final String DEFAULT_PREFIX = "org.javasimon.business";

	/**
	 * Simon name prefix - can be overridden in subclasses.
	 */
	protected String prefix = DEFAULT_PREFIX;

	public MethodStopwatchSource(Manager manager) {
		super(manager);
	}

	public String getPrefix() {
		return prefix;
	}

	public void setPrefix(String prefix) {
		this.prefix = prefix;
	}

	@Override
	protected final Class getTargetClass(InvocationContext context) {
		return context.getTarget().getClass();
	}

	@Override
	protected final Method getTargetMethod(InvocationContext context) {
		return context.getMethod();
	}

	/**
	 * Returns Simon name for the specified Invocation context.
	 * By default it contains the prefix + method name.
	 * This method can be overridden.
	 *
	 * @param context Invocation context
	 * @return fully qualified name of the Simon
	 * @since 3.1
	 */
	protected String getMonitorName(InvocationContext context) {
		String className = context.getMethod().getDeclaringClass().getSimpleName();
		String methodName = context.getMethod().getName();
		return prefix + Manager.HIERARCHY_DELIMITER + className + Manager.HIERARCHY_DELIMITER + methodName;
	}
}