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Temporal Java SDK OpenTracing Support Module

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/*
 * Copyright (C) 2022 Temporal Technologies, Inc. All Rights Reserved.
 *
 * Copyright (C) 2012-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Modifications copyright (C) 2017 Uber Technologies, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this material 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.temporal.opentracing.codec;

import io.opentracing.SpanContext;
import io.opentracing.Tracer;
import io.opentracing.propagation.Format;
import io.opentracing.propagation.TextMapAdapter;
import io.temporal.opentracing.OpenTracingSpanContextCodec;
import java.util.HashMap;
import java.util.Map;

/**
 * This Encoder uses {@link io.opentracing.propagation.Format.Builtin#TEXT_MAP} for both
 * serialization and deserialization. This is not a default strategy, for default strategy see
 * {@link TextMapInjectExtractCodec}. This strategy was added as a workaround if the specific
 * opentracing client implementation doesn't support {@link
 * io.opentracing.propagation.Format.Builtin#TEXT_MAP_INJECT} and {@link
 * io.opentracing.propagation.Format.Builtin#TEXT_MAP_EXTRACT}
 */
public class TextMapCodec implements OpenTracingSpanContextCodec {
  public static final TextMapCodec INSTANCE = new TextMapCodec();

  @Override
  public Map encode(SpanContext spanContext, Tracer tracer) {
    Map serialized = new HashMap<>();
    tracer.inject(spanContext, Format.Builtin.TEXT_MAP, new TextMapAdapter(serialized));
    return serialized;
  }

  @Override
  public SpanContext decode(Map serializedSpanContext, Tracer tracer) {
    return tracer.extract(Format.Builtin.TEXT_MAP, new TextMapAdapter(serializedSpanContext));
  }
}