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TracedBatcherUnaryCallable.java
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TracedBatcherUnaryCallable.java
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/*
* Copyright 2021 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,
* 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 com.google.cloud.bigtable.data.v2.stub.metrics;
import com.google.api.core.ApiFuture;
import com.google.api.core.InternalApi;
import com.google.api.gax.batching.Batcher;
import com.google.api.gax.rpc.ApiCallContext;
import com.google.api.gax.rpc.UnaryCallable;
import com.google.api.gax.tracing.ApiTracer;
/**
* This callable will extract total throttled time from {@link ApiCallContext} and add it to {@link
* ApiTracer}. This class needs to be wrapped by a callable that injects the {@link ApiTracer}.
*/
@InternalApi
public final class TracedBatcherUnaryCallable<RequestT, ResponseT>
extends UnaryCallable<RequestT, ResponseT> {
private final UnaryCallable<RequestT, ResponseT> innerCallable;
public TracedBatcherUnaryCallable(UnaryCallable innerCallable) {
this.innerCallable = innerCallable;
}
@Override
public ApiFuture<ResponseT> futureCall(RequestT request, ApiCallContext context) {
if (context.getOption(Batcher.THROTTLED_TIME_KEY) != null) {
ApiTracer tracer = context.getTracer();
// this should always be true
if (tracer instanceof BigtableTracer) {
((BigtableTracer) tracer)
.batchRequestThrottled(context.getOption(Batcher.THROTTLED_TIME_KEY));
}
}
return innerCallable.futureCall(request, context);
}
}