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// START-SAMPLE tracing-traceJoinPoints Trace join points executed to log
/* TraceJoinPoints.java */
package tracing;
import org.aspectj.lang.*;
import org.aspectj.lang.reflect.*;
import java.io.*;
/**
* Print join points being executed in context to a log.xml file.
* To use this, define the abstract pointcuts in a subaspect.
* @author Jim Hugunin, Wes Isberg
*/
public abstract aspect TraceJoinPoints
extends TraceJoinPointsBase {
// abstract protected pointcut entry();
PrintStream out;
int logs = 0;
int depth = 0;
boolean terminal = false;
/**
* Emit a message in the log, e.g.,
* <pre>TraceJoinPoints tjp = TraceJoinPoints.aspectOf();
* if (null != tjp) tjp.message("Hello, World!");</pre>
*/
public void message(String s) {
out.println("<message>" + prepareMessage(s) + "</message>");
}
protected void startLog() {
makeLogStream();
}
protected void completeLog() {
closeLogStream();
}
protected void logEnter(JoinPoint.StaticPart jp) {
if (terminal) out.println(">");
indent(depth);
out.print("<" + jp.getKind());
writeSig(jp);
writePos(jp);
depth += 1;
terminal = true;
}
protected void logExit(JoinPoint.StaticPart jp) {
depth -= 1;
if (terminal) {
getOut().println("/>");
} else {
indent(depth);
getOut().println("</" + jp.getKind() + ">");
}
terminal = false;
}
protected PrintStream getOut() {
if (null == out) {
String m = "not in the control flow of entry()";
throw new IllegalStateException(m);
}
return out;
}
protected void makeLogStream() {
try {
String name = "log" + logs++ + ".xml";
out = new PrintStream(new FileOutputStream(name));
} catch (IOException ioe) {
out = System.err;
}
}
protected void closeLogStream() {
PrintStream out = this.out;
if (null != out) {
out.close();
// this.out = null;
}
}
/** @return input String formatted for XML */
protected String prepareMessage(String s) { // XXX unimplemented
return s;
}
void message(String sink, String s) {
if (null == sink) {
message(s);
} else {
getOut().println("<message sink=" + quoteXml(sink)
+ " >" + prepareMessage(s) + "</message>");
}
}
void writeSig(JoinPoint.StaticPart jp) {
PrintStream out = getOut();
out.print(" sig=");
out.print(quoteXml(jp.getSignature().toShortString()));
}
void writePos(JoinPoint.StaticPart jp) {
SourceLocation loc = jp.getSourceLocation();
if (loc == null) return;
PrintStream out = getOut();
out.print(" pos=");
out.print(quoteXml(loc.getFileName() +
":" + loc.getLine() +
":" + loc.getColumn()));
}
protected String quoteXml(String s) { // XXX weak
return "\"" + s.replace('<', '_').replace('>', '_') + "\"";
}
protected void indent(int i) {
PrintStream out = getOut();
while (i-- > 0) out.print(" ");
}
}
// END-SAMPLE tracing-traceJoinPoints
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