com.uber.jaeger.SpanContext Maven / Gradle / Ivy

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/*
 * Copyright (c) 2016, Uber Technologies, Inc
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.uber.jaeger;

import com.uber.jaeger.exceptions.*;

import java.math.BigInteger;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

public class SpanContext implements io.opentracing.SpanContext {
    protected static final byte flagSampled = 1;
    protected static final byte flagDebug = 2;

    private final long traceID;
    private final long spanID;
    private final long parentID;
    private final byte flags;
    private final Map baggage;

    public SpanContext(long traceID, long spanID, long parentID, byte flags) {
        this(traceID, spanID, parentID, flags, Collections.emptyMap());
    }

    SpanContext(long traceID, long spanID, long parentID, byte flags, Map baggage) {
        if (baggage == null) {
            throw new NullPointerException();
        }
        this.traceID = traceID;
        this.spanID = spanID;
        this.parentID = parentID;
        this.flags = flags;
        this.baggage = baggage;
    }

    @Override
    public Iterable> baggageItems() {
        return baggage.entrySet();
    }

    public String getBaggageItem(String key) { return this.baggage.get(key); }

    Map baggage() {
        return this.baggage;
    }

    public long getTraceID() {
        return traceID;
    }

    public long getSpanID() {
        return spanID;
    }

    public long getParentID() {
        return parentID;
    }

    public byte getFlags() {
        return flags;
    }

    public boolean isSampled() {
        return (flags & flagSampled) == flagSampled;
    }

    public boolean isDebug() {
        return (flags & flagDebug) == flagDebug;
    }

    public String contextAsString() {
        // TODO(oibe) profile, and make sure this is fast enough
        return String.format("%x:%x:%x:%x", traceID, spanID, parentID, flags);
    }

    @Override
    public String toString() {
        return contextAsString();
    }

    public static SpanContext contextFromString(String value) throws MalformedTracerStateStringException, EmptyTracerStateStringException{
        if (value == null || value.equals("")) {
            throw new EmptyTracerStateStringException();
        }

        String[] parts = value.split(":");
        if (parts.length != 4) {
            throw new MalformedTracerStateStringException(value);
        }

        /*
           TODO(oibe) because java doesn't like to convert large hex strings to longs
           we should write this manually instead of using BigInteger.
         */
        return new SpanContext(
            new BigInteger(parts[0], 16).longValue(),
            new BigInteger(parts[1], 16).longValue(),
            new BigInteger(parts[2], 16).longValue(),
            new BigInteger(parts[3], 16).byteValue());
    }

    public SpanContext withBaggageItem(String key, String val) {
        Map newBaggage = new HashMap<>(this.baggage);
        newBaggage.put(key, val);
        return new SpanContext(traceID, spanID, parentID, flags, newBaggage);
    }

    public SpanContext withBaggage(Map newBaggage) {
        return new SpanContext(traceID, spanID, parentID, flags, newBaggage);
    }

    public SpanContext withFlags(byte flags) {
        return new SpanContext(traceID, spanID, parentID, flags, baggage);
    }
}