org.apache.htrace.impl.MilliSpan Maven / Gradle / Ivy
/*
* 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.apache.htrace.impl;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectWriter;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import org.apache.htrace.Span;
import org.apache.htrace.TimelineAnnotation;
import org.apache.htrace.Tracer;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import java.io.StringWriter;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Random;
/**
* A Span implementation that stores its information in milliseconds since the
* epoch.
*/
@JsonDeserialize(using = MilliSpan.MilliSpanDeserializer.class)
public class MilliSpan implements Span {
private static Random rand = new Random();
private static ObjectWriter JSON_WRITER = new ObjectMapper().writer();
private long begin;
private long end;
private final String description;
private final long traceId;
private final long parents[];
private final long spanId;
private Map traceInfo = null;
private final String processId;
private List timeline = null;
@Override
public Span child(String description) {
return new MilliSpan(description, traceId, spanId, rand.nextLong(), processId);
}
/**
* The public interface for constructing a MilliSpan.
*/
public static class Builder {
private long begin;
private long end;
private String description;
private long traceId;
private long parents[];
private long spanId;
private Map traceInfo = null;
private String processId;
private List timeline = null;
public Builder() {
}
public Builder begin(long begin) {
this.begin = begin;
return this;
}
public Builder end(long end) {
this.end = end;
return this;
}
public Builder description(String description) {
this.description = description;
return this;
}
public Builder traceId(long traceId) {
this.traceId = traceId;
return this;
}
public Builder parents(long parents[]) {
this.parents = parents;
return this;
}
public Builder parents(List parentList) {
long[] parents = new long[parentList.size()];
for (int i = 0; i < parentList.size(); i++) {
parents[i] = parentList.get(i).longValue();
}
this.parents = parents;
return this;
}
public Builder spanId(long spanId) {
this.spanId = spanId;
return this;
}
public Builder traceInfo(Map traceInfo) {
this.traceInfo = traceInfo.isEmpty() ? null : traceInfo;
return this;
}
public Builder processId(String processId) {
this.processId = processId;
return this;
}
public Builder timeline(List timeline) {
this.timeline = timeline.isEmpty() ? null : timeline;
return this;
}
public MilliSpan build() {
return new MilliSpan(this);
}
}
private MilliSpan(Builder builder) {
this.begin = builder.begin;
this.end = builder.end;
this.description = builder.description;
this.traceId = builder.traceId;
this.parents = builder.parents;
this.spanId = builder.spanId;
this.traceInfo = builder.traceInfo;
this.processId = builder.processId;
this.timeline = builder.timeline;
}
public MilliSpan(String description, long traceId, long parentSpanId, long spanId, String processId) {
this.description = description;
this.traceId = traceId;
if (parentSpanId == Span.ROOT_SPAN_ID) {
this.parents = new long[0];
} else {
this.parents = new long[] { parentSpanId };
}
this.spanId = spanId;
this.begin = System.currentTimeMillis();
this.end = 0;
this.processId = processId;
}
@Override
public synchronized void stop() {
if (end == 0) {
if (begin == 0)
throw new IllegalStateException("Span for " + description
+ " has not been started");
end = System.currentTimeMillis();
Tracer.getInstance().deliver(this);
}
}
protected long currentTimeMillis() {
return System.currentTimeMillis();
}
@Override
public synchronized boolean isRunning() {
return begin != 0 && end == 0;
}
@Override
public synchronized long getAccumulatedMillis() {
if (begin == 0)
return 0;
if (end > 0)
return end - begin;
return currentTimeMillis() - begin;
}
@Override
public String toString() {
return toJson();
}
@Override
public String getDescription() {
return description;
}
@Override
public long getSpanId() {
return spanId;
}
// TODO: Fix API callers to deal with multiple parents, and get rid of
// Span.ROOT_SPAN_ID.
@Override
public long getParentId() {
if (parents.length == 0) {
return Span.ROOT_SPAN_ID;
}
return parents[0];
}
@Override
public long getTraceId() {
return traceId;
}
@Override
public long getStartTimeMillis() {
return begin;
}
@Override
public long getStopTimeMillis() {
return end;
}
@Override
public void addKVAnnotation(byte[] key, byte[] value) {
if (traceInfo == null)
traceInfo = new HashMap();
traceInfo.put(key, value);
}
@Override
public void addTimelineAnnotation(String msg) {
if (timeline == null) {
timeline = new ArrayList();
}
timeline.add(new TimelineAnnotation(System.currentTimeMillis(), msg));
}
@Override
public Map getKVAnnotations() {
if (traceInfo == null)
return Collections.emptyMap();
return Collections.unmodifiableMap(traceInfo);
}
@Override
public List getTimelineAnnotations() {
if (timeline == null) {
return Collections.emptyList();
}
return Collections.unmodifiableList(timeline);
}
@Override
public String getProcessId() {
return processId;
}
@Override
public String toJson() {
StringWriter writer = new StringWriter();
try {
JSON_WRITER.writeValue(writer, this);
} catch (IOException e) {
// An IOException should not be possible when writing to a string.
throw new RuntimeException(e);
}
return writer.toString();
}
private static long parseUnsignedHexLong(String s) {
return new BigInteger(s, 16).longValue();
}
public static class MilliSpanDeserializer
extends JsonDeserializer {
@Override
public MilliSpan deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException {
JsonNode root = jp.getCodec().readTree(jp);
Builder builder = new Builder();
builder.begin(root.get("b").asLong()).
end(root.get("e").asLong()).
description(root.get("d").asText()).
traceId(parseUnsignedHexLong(root.get("i").asText())).
spanId(parseUnsignedHexLong(root.get("s").asText())).
processId(root.get("r").asText());
JsonNode parentsNode = root.get("p");
LinkedList parents = new LinkedList();
for (Iterator iter = parentsNode.elements();
iter.hasNext(); ) {
JsonNode parentIdNode = iter.next();
parents.add(parseUnsignedHexLong(parentIdNode.asText()));
}
builder.parents(parents);
JsonNode traceInfoNode = root.get("n");
if (traceInfoNode != null) {
HashMap traceInfo = new HashMap();
for (Iterator iter = traceInfoNode.fieldNames();
iter.hasNext(); ) {
String field = iter.next();
traceInfo.put(field.getBytes("UTF-8"),
traceInfoNode.get(field).asText().getBytes("UTF-8"));
}
builder.traceInfo(traceInfo);
}
JsonNode timelineNode = root.get("t");
if (timelineNode != null) {
LinkedList timeline =
new LinkedList();
for (Iterator iter = timelineNode.elements();
iter.hasNext(); ) {
JsonNode ann = iter.next();
timeline.add(new TimelineAnnotation(ann.get("t").asLong(),
ann.get("m").asText()));
}
builder.timeline(timeline);
}
return builder.build();
}
}
}
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