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Support for Zipkin distributed tracing system.

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/*
 * Copyright (c) 2018, 2021 Oracle and/or its affiliates.
 *
 * Licensed 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 io.helidon.tracing.zipkin;

import java.util.Map;

import io.opentracing.Span;
import io.opentracing.SpanContext;
import io.opentracing.tag.Tag;

/**
 * The ZipkinSpan delegates to another {@link Span} while finishing the
 * {@link Span} with tag {@code ss} Zipkin understands as an end of the span.
 *
 * @see Zipkin Attributes
 * @see Zipkin Missing Service Name
 */
class ZipkinSpan implements Span {
    private final Span span;

    ZipkinSpan(Span span) {
        this.span = span;
    }

    @Override
    public SpanContext context() {
        return span.context();
    }

    @Override
    public void finish() {
        span.log("ss");
        span.finish();
    }

    @Override
    public void finish(long finishMicros) {
        span.log("ss");
        span.finish(finishMicros);
    }

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

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

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

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

    @Override
    public Span log(long timestampMicroseconds, Map fields) {
        span.log(timestampMicroseconds, fields);
        return this;
    }

    @Override
    public Span log(String event) {
        span.log(event);
        return this;
    }

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

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

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

    @Override
    public Span setOperationName(String operationName) {
        span.setOperationName(operationName);
        return this;
    }

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

    Span unwrap() {
        return span;
    }
}