songy23

// Copyright 2019 Google LLC
//
// 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
//
//     https://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,

songy23

    # Execute a simple SQL statement.
    spanner_api = database.spanner_api
    transport = spanner_api.transport
    request = spanner_pb2.ExecuteSqlRequest(
            session=session.name,
            sql='SELECT * FROM TEST',
        )
    result_set, call = transport.execute_sql.with_call(request)
    headers = call.initial_metadata() # is a tuple
    server_timing = dict(headers)['server-timing']

songy23

var md metadata.MD
resultSet, err := client.ExecuteSql(ctx, req, gax.WithGRPCOptions(grpc.Header(&md)))
srvTiming := md.Get("server-timing")
// Process the header

songy23

    // Instantiates a client
    SpannerOptions options =
        SpannerOptions.newBuilder()
            .setInterceptorProvider(() -> Collections.singletonList(interceptor))
            .build();
    Spanner spanner = options.getService();

songy23

  private static final HeaderClientInterceptor interceptor = new HeaderClientInterceptor();
  private static final Metadata.Key<String> SERVER_TIMING_HEADER_KEY =
        Metadata.Key.of("server-timing", Metadata.ASCII_STRING_MARSHALLER);

  private static class HeaderClientInterceptor implements ClientInterceptor {
    @Override
    public <ReqT, RespT> ClientCall<ReqT, RespT> interceptCall(MethodDescriptor<ReqT, RespT> method,
        CallOptions callOptions, Channel next) {
      return new SimpleForwardingClientCall<ReqT, RespT>(next.newCall(method, callOptions)) {

songy23

// Copyright 2019 Google LLC
//
// 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
//
//     https://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,

songy23

/*
 * Copyright 2018, OpenCensus Authors
 *
 * 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