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AbstractMetricCollectingClient.java
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AbstractMetricCollectingClient.java
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/*
* Copyright 2019 LINE Corporation
*
* LINE Corporation licenses this file to you 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.linecorp.armeria.client.metric;
import static java.util.Objects.requireNonNull;
import com.linecorp.armeria.client.Client;
import com.linecorp.armeria.client.ClientRequestContext;
import com.linecorp.armeria.client.SimpleDecoratingClient;
import com.linecorp.armeria.common.Request;
import com.linecorp.armeria.common.Response;
import com.linecorp.armeria.common.metric.MeterIdPrefixFunction;
import com.linecorp.armeria.internal.common.metric.RequestMetricSupport;
import io.micrometer.core.instrument.MeterRegistry;
import io.netty.util.AttributeKey;
/**
* Decorates a {@link Client} to collect metrics into {@link MeterRegistry}.
*/
abstract class AbstractMetricCollectingClient<I extends Request, O extends Response>
extends SimpleDecoratingClient<I, O> {
// A variable to make sure setup method is not called twice.
private static final AttributeKey<Boolean> REQUEST_METRICS_SET =
AttributeKey.valueOf(AbstractMetricCollectingClient.class, "REQUEST_METRICS_SET");
private final MeterIdPrefixFunction meterIdPrefixFunction;
AbstractMetricCollectingClient(Client<I, O> delegate, MeterIdPrefixFunction meterIdPrefixFunction) {
super(delegate);
this.meterIdPrefixFunction = requireNonNull(meterIdPrefixFunction, "meterIdPrefixFunction");
}
@Override
public final O execute(ClientRequestContext ctx, I req) throws Exception {
RequestMetricSupport.setup(ctx, REQUEST_METRICS_SET, meterIdPrefixFunction, false);
return unwrap().execute(ctx, req);
}
}