/
StatsHeadersUnaryCallable.java
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/
StatsHeadersUnaryCallable.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.rpc.ApiCallContext;
import com.google.api.gax.rpc.UnaryCallable;
/**
* A callable that injects client timestamp and current attempt number to request headers. Attempt
* number starts from 0.
*/
@InternalApi("For internal use only")
public final class StatsHeadersUnaryCallable<RequestT, ResponseT>
extends UnaryCallable<RequestT, ResponseT> {
private final UnaryCallable innerCallable;
public StatsHeadersUnaryCallable(UnaryCallable innerCallable) {
this.innerCallable = innerCallable;
}
@Override
public ApiFuture futureCall(RequestT request, ApiCallContext apiCallContext) {
ApiCallContext newCallContext =
apiCallContext.withExtraHeaders(Util.createStatsHeaders(apiCallContext));
return innerCallable.futureCall(request, newCallContext);
}
}