com.netflix.spectator.api.RegistryMeter Maven / Gradle / Ivy
/**
* Copyright 2015 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.api;
import java.util.ArrayList;
import java.util.List;
/**
* Wraps a registry as a meter that can be added to another registry. This is currently used to
* manage the gauges for the composite registry. Since there is no activity, gauges should get
* polled and must get tracked as a group and added to each sub-registry.
*/
class RegistryMeter implements Meter {
private final Id id;
private final Registry registry;
/** Create a new instance. */
RegistryMeter(Id id) {
this(id, new DefaultRegistry());
}
/** Create a new instance. */
RegistryMeter(Id id, Registry registry) {
this.id = id;
this.registry = registry;
}
/** Register a meter with the wrapped registry. */
void register(Meter meter) {
registry.register(meter);
}
@Override public Id id() {
return id;
}
@Override public Iterable measure() {
List ms = new ArrayList<>();
for (Meter m : registry) {
try {
for (Measurement measurement : m.measure()) {
ms.add(measurement);
}
} catch (Exception | LinkageError e) {
// Linkage errors sometimes happen due to compatibility issues. If it is a problem for
// the application, then it can fail elsewhere. If it happens for monitoring, then the
// additional context of the id is typically helpful.
Throwables.propagate("failed to measure " + m.id(), e);
}
}
return ms;
}
@Override public boolean hasExpired() {
return false;
}
}