
com.netflix.spectator.sidecar.SidecarMeter Maven / Gradle / Ivy
/*
* Copyright 2014-2022 Netflix, Inc.
*
* 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.netflix.spectator.sidecar;
import com.netflix.spectator.api.Id;
import com.netflix.spectator.api.Measurement;
import com.netflix.spectator.api.Meter;
import com.netflix.spectator.impl.AsciiSet;
import java.util.Collections;
/** Base class for core meter types used by {@link SidecarRegistry}. */
abstract class SidecarMeter implements Meter {
private static final AsciiSet ALLOWED_CHARS = AsciiSet.fromPattern("-._A-Za-z0-9~^");
/** Base identifier for all measurements supplied by this meter. */
protected final Id id;
/** Prefix string for line to output to SpectatorD. */
protected final String idString;
/** Create a new instance. */
SidecarMeter(Id id, char type) {
this.id = id;
this.idString = createIdString(id, type);
}
private String replaceInvalidChars(String s) {
return ALLOWED_CHARS.replaceNonMembers(s, '_');
}
private String createIdString(Id id, char type) {
StringBuilder builder = new StringBuilder();
builder.append(type).append(':').append(replaceInvalidChars(id.name()));
int n = id.size();
for (int i = 1; i < n; ++i) {
String k = replaceInvalidChars(id.getKey(i));
String v = replaceInvalidChars(id.getValue(i));
builder.append(',').append(k).append('=').append(v);
}
return builder.append(':').toString();
}
@Override public Id id() {
return id;
}
@Override public boolean hasExpired() {
return false;
}
@Override public Iterable measure() {
return Collections.emptyList();
}
}
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