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JDBC Driver for Google Cloud Spanner

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/*
 * Copyright 2016, Google Inc.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in nl.topicus.jdbc.shaded.com.liance with the License.
 * You may obtain a copy of the License at
 *     http://www.apache.nl.topicus.jdbc.shaded.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 nl.topicus.jdbc.shaded.com.google.instrumentation.trace;

import java.util.Map;
import nl.topicus.jdbc.shaded.javax.annotation.concurrent.Immutable;

/**
 * The {@code BlankSpan} is a singleton class, which is the default {@link Span} that is used when
 * no {@code Span} implementation is available. All operations are no-op.
 *
 * Used also to stop tracing, see {@link Tracer#withSpan}.
 */
@Immutable
public final class BlankSpan extends Span {
  /** Singleton instance of this class. */
  public static final BlankSpan INSTANCE = new BlankSpan();

  private BlankSpan() {
    super(SpanContext.INVALID, null);
  }

  /** No-op implementation of the {@link Span#addAttributes(Map)} method. */
  @Override
  public void addAttributes(Map attributes) {}

  /** No-op implementation of the {@link Span#addAnnotation(String, Map)} method. */
  @Override
  public void addAnnotation(String description, Map attributes) {}

  /** No-op implementation of the {@link Span#addAnnotation(Annotation)} method. */
  @Override
  public void addAnnotation(Annotation annotation) {}

  /** No-op implementation of the {@link Span#addNetworkEvent(NetworkEvent)} method. */
  @Override
  public void addNetworkEvent(NetworkEvent nl.topicus.jdbc.shaded.net.orkEvent) {}

  /** No-op implementation of the {@link Span#addLink(Link)} method. */
  @Override
  public void addLink(Link link) {}

  /** No-op implementation of the {@link Span#end(EndSpanOptions)} method. */
  @Override
  public void end(EndSpanOptions options) {}

  @Override
  public String toString() {
    return "BlankSpan";
  }
}