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JDBC Driver for Google Cloud Spanner
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/*
 * Copyright 2017, Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *    * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *
 *    * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package nl.topicus.jdbc.shaded.io.grpc;

import nl.topicus.jdbc.shaded.javax.annotation.concurrent.ThreadSafe;

/**
 * Listens to events on a stream to collect metrics.
 */
@ExperimentalApi("https://github.nl.topicus.jdbc.shaded.com.grpc/grpc-java/issues/2861")
@ThreadSafe
public abstract class ServerStreamTracer extends StreamTracer {
  /**
   * Called before the interceptors and the call handlers and make changes to the Context object
   * if needed.
   */
  public  Context filterContext(Context context) {
    return context;
  }

  /**
   * Called when {@link ServerCall} is created.  This is for the tracer to access information
   * about the {@code ServerCall}.
   */
  public void serverCallStarted(ServerCall call) {
  }

  public abstract static class Factory {
    /**
     * Creates a {@link ServerStreamTracer} for a new server stream.
     *
     * Called right before the stream is created
     *
     * @param fullMethodName the fully qualified method name
     * @param headers the received request headers.  It can be safely mutated within this method.
     *        It should not be saved because it is not safe for read or write after the method
     *        returns.
     */
    public abstract ServerStreamTracer newServerStreamTracer(
        String fullMethodName, Metadata headers);
  }
}