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// Copyright (C) 2015 The Android Open Source Project
//
// 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
// 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.gerrit.httpd.restapi;
import com.google.common.base.Strings;
import com.google.gerrit.httpd.restapi.RestApiServlet.ViewData;
import com.google.gerrit.metrics.Counter1;
import com.google.gerrit.metrics.Counter2;
import com.google.gerrit.metrics.Description;
import com.google.gerrit.metrics.Description.Units;
import com.google.gerrit.metrics.Field;
import com.google.gerrit.metrics.Histogram1;
import com.google.gerrit.metrics.MetricMaker;
import com.google.gerrit.metrics.Timer1;
import com.google.inject.Inject;
import com.google.inject.Singleton;
@Singleton
public class RestApiMetrics {
private static final String[] PKGS = {
"com.google.gerrit.server.", "com.google.gerrit.",
};
final Counter1<String> count;
final Counter2<String, Integer> errorCount;
final Timer1<String> serverLatency;
final Histogram1<String> responseBytes;
@Inject
RestApiMetrics(MetricMaker metrics) {
Field<String> view = Field.ofString("view", "view implementation class");
count =
metrics.newCounter(
"http/server/rest_api/count",
new Description("REST API calls by view").setRate(),
view);
errorCount =
metrics.newCounter(
"http/server/rest_api/error_count",
new Description("REST API errors by view").setRate(),
view,
Field.ofInteger("error_code", "HTTP status code"));
serverLatency =
metrics.newTimer(
"http/server/rest_api/server_latency",
new Description("REST API call latency by view")
.setCumulative()
.setUnit(Units.MILLISECONDS),
view);
responseBytes =
metrics.newHistogram(
"http/server/rest_api/response_bytes",
new Description("Size of response on network (may be gzip compressed)")
.setCumulative()
.setUnit(Units.BYTES),
view);
}
String view(ViewData viewData) {
String impl = viewData.view.getClass().getName().replace('$', '.');
for (String p : PKGS) {
if (impl.startsWith(p)) {
impl = impl.substring(p.length());
break;
}
}
if (!Strings.isNullOrEmpty(viewData.pluginName) && !"gerrit".equals(viewData.pluginName)) {
impl = viewData.pluginName + '-' + impl;
}
return impl;
}
}
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