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The LightStep OpenTracing Tracer implementation for Java

There is a newer version: 0.32.0

package com.lightstep.tracer.shared;

import java.util.Collections;
import java.util.Map;

import io.opentracing.Span;
import io.opentracing.SpanContext;

// A span which is returned when the tracer is disabled.
class NoopSpan implements Span {
    static final Span INSTANCE = new NoopSpan();
    private static final SpanContext CONTEXT = new NoopSpanContext();

    private NoopSpan() {}

    @Override
    public SpanContext context() {
        return CONTEXT;
    }

    @Override
    public void finish() {}

    @Override
    public void finish(long timestamp) {}

    @Override
    public Span setTag(String key, String value) {
        return this;
    }

    @Override
    public Span setTag(String key, boolean value) {
        return this;
    }

    @Override
    public Span setTag(String key, Number value) {
        return this;
    }

    @Override
    public  Span setTag(io.opentracing.tag.Tag tag, T value) {
        return this;
    }

    @Override
    public Span log(String message) {
        return this;
    }

    @Override
    public Span log(long timestampMicroseconds, String message) {
        return this;
    }

    @Override
    public final Span log(Map fields) {
        return this;
    }

    @Override
    public final Span log(long timestampMicros, Map fields) {
        return this;
    }

    @Override
    public String getBaggageItem(String key) {
        return null;
    }

    @Override
    public Span setBaggageItem(String key, String value) {
        return this;
    }

    public Span setOperationName(String operationName) {
        return this;
    }

    private static class NoopSpanContext implements SpanContext {
        @Override
        public Iterable> baggageItems() {
            return Collections.emptySet();
        }

        @Override
        public String toTraceId() {
            return "";
        }

        @Override
        public String toSpanId() {
            return "";
        }
    }
}