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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.htrace;
import org.htrace.impl.MilliSpan;
import org.htrace.impl.TrueIfTracingSampler;
import org.htrace.wrappers.TraceCallable;
import org.htrace.wrappers.TraceRunnable;
import java.security.SecureRandom;
import java.util.Random;
import java.util.concurrent.Callable;
/**
* The primary way to interact with the library. Provides methods to start
* spans, as well as set necessary tracing information.
*/
public class Trace {
private final static Random random = new SecureRandom();
/**
* Starts and returns a new span as the child of the current span if the
* default sampler (TrueIfTracingSampler) returns true, otherwise returns the
* NullSpan.
*
* @param description Description of the span to be created.
* @return
*/
public static TraceScope startSpan(String description) {
return startSpan(description, TrueIfTracingSampler.INSTANCE);
}
/**
* Starts and returns a new span as the child of the parameter 'parent'. This
* will always return a new span, even if tracing wasn't previously enabled for
* this thread.
*
* @param description Description of the span to be created.
* @param parent The parent that should be used to create the child span that is to
* be returned.
* @return
*/
public static TraceScope startSpan(String description, Span parent) {
if (parent == null) return startSpan(description);
return continueSpan(parent.child(description));
}
public static TraceScope startSpan(String description, TraceInfo tinfo) {
if (tinfo == null) return continueSpan(null);
Span newSpan = new MilliSpan(description, tinfo.traceId, tinfo.spanId,
random.nextLong(), Tracer.getProcessId());
return continueSpan(newSpan);
}
public static TraceScope startSpan(String description, Sampler s) {
return startSpan(description, s, null);
}
public static TraceScope startSpan(String description, Sampler s, TraceInfo tinfo) {
Span span = null;
if (isTracing() || s.next(tinfo)) {
span = new MilliSpan(description, tinfo.traceId, tinfo.spanId,
random.nextLong(), Tracer.getProcessId());
}
return continueSpan(span);
}
public static TraceScope startSpan(String description, Sampler s, T info) {
Span span = null;
if (isTracing() || s.next(info)) {
span = Tracer.getInstance().createNew(description);
}
return continueSpan(span);
}
/**
* Pick up an existing span from another thread.
*/
public static TraceScope continueSpan(Span s) {
// Return an empty TraceScope that does nothing on
// close
if (s == null) return new TraceScope(null, null);
return Tracer.getInstance().continueSpan(s);
}
/**
* Set the processId to be used for all Spans created by this Tracer.
*
* @param processId
* @see Span.java
*/
public static void setProcessId(String processId) {
Tracer.processId = processId;
}
/**
* Removes the given SpanReceiver from the list of SpanReceivers.
*
* @param rcvr
*/
public static void removeReceiver(SpanReceiver rcvr) {
Tracer.getInstance().removeReceiver(rcvr);
}
/**
* Adds the given SpanReceiver to the current Tracer instance's list of
* SpanReceivers.
*
* @param rcvr
*/
public static void addReceiver(SpanReceiver rcvr) {
Tracer.getInstance().addReceiver(rcvr);
}
/**
* Adds a data annotation to the current span if tracing is currently on.
*/
public static void addKVAnnotation(byte[] key, byte[] value) {
Span s = currentSpan();
if (s != null) {
s.addKVAnnotation(key, value);
}
}
/**
* Annotate the current span with the given message.
*/
public static void addTimelineAnnotation(String msg) {
Span s = currentSpan();
if (s != null) {
s.addTimelineAnnotation(msg);
}
}
/**
* Returns true if the current thread is a part of a trace, false otherwise.
*
* @return
*/
public static boolean isTracing() {
return Tracer.getInstance().isTracing();
}
/**
* If we are tracing, return the current span, else null
*
* @return Span representing the current trace, or null if not tracing.
*/
public static Span currentSpan() {
return Tracer.getInstance().currentSpan();
}
/**
* Wrap the callable in a TraceCallable, if tracing.
*
* @param callable
* @return The callable provided, wrapped if tracing, 'callable' if not.
*/
public static Callable wrap(Callable callable) {
if (isTracing()) {
return new TraceCallable(Trace.currentSpan(), callable);
} else {
return callable;
}
}
/**
* Wrap the runnable in a TraceRunnable, if tracing
*
* @param runnable
* @return The runnable provided, wrapped if tracing, 'runnable' if not.
*/
public static Runnable wrap(Runnable runnable) {
if (isTracing()) {
return new TraceRunnable(Trace.currentSpan(), runnable);
} else {
return runnable;
}
}
/**
* Wrap the runnable in a TraceRunnable, if tracing
*
* @param description name of the span to be created.
* @param runnable
* @return The runnable provided, wrapped if tracing, 'runnable' if not.
*/
public static Runnable wrap(String description, Runnable runnable) {
if (isTracing()) {
return new TraceRunnable(Trace.currentSpan(), runnable, description);
} else {
return runnable;
}
}
}
