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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config.protocol;
import com.yahoo.slime.*;
import com.yahoo.text.Utf8;
import com.yahoo.yolean.trace.TraceNode;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.time.Clock;
/**
* A trace utility that can serialize/deserialize to/from {@link Slime}
*
* @author Ulf Lilleengen
*/
public class Trace {
private static final String TRACE_TRACELOG = "traceLog";
private static final String TRACE_TRACELEVEL = "traceLevel";
private final int traceLevel;
private final TraceNode traceNode;
private final Clock clock;
private Trace(int traceLevel, TraceNode traceNode, Clock clock) {
this.traceLevel = traceLevel;
this.traceNode = traceNode;
this.clock = clock;
}
public void trace(int level, String message) {
if (shouldTrace(level)) {
addTrace(message);
}
}
private void addTrace(String message) {
traceNode.add(new TraceNode(message, clock.millis()));
}
public static Trace createNew(int traceLevel, Clock clock) {
return new Trace(traceLevel, new TraceNode(null, clock.millis()), clock);
}
public static Trace createNew(int traceLevel) {
return createNew(traceLevel, Clock.systemUTC());
}
public static Trace fromSlime(Inspector inspector) {
int traceLevel = deserializeTraceLevel(inspector);
Clock clock = Clock.systemUTC();
SlimeTraceDeserializer deserializer = new SlimeTraceDeserializer(inspector.field(TRACE_TRACELOG));
return new Trace(traceLevel, deserializer.deserialize(), clock);
}
private static int deserializeTraceLevel(Inspector inspector) {
return (int) inspector.field(TRACE_TRACELEVEL).asLong();
}
public void serialize(Cursor cursor) {
cursor.setLong(TRACE_TRACELEVEL, traceLevel);
SlimeTraceSerializer serializer = new SlimeTraceSerializer(cursor.setObject(TRACE_TRACELOG));
traceNode.accept(serializer);
}
public static Trace createDummy() {
return Trace.createNew(0);
}
public int getTraceLevel() {
return traceLevel;
}
public boolean shouldTrace(int level) {
return level <= traceLevel;
}
public String toString(boolean compact) {
Slime slime = new Slime();
serialize(slime.setObject());
JsonFormat format = new JsonFormat(compact);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
format.encode(baos, slime);
} catch (IOException e) {
throw new IllegalArgumentException("Unable to encode trace as JSON", e);
}
return Utf8.toString(baos.toByteArray());
}
@Override
public String toString() {
return toString(false);
}
private final static int systemTraceLevel = Integer.getInteger("config.protocol.traceLevel", 0);
public static Trace createNew() {
return createNew(systemTraceLevel);
}
}
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