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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.metrics.dropwizard;
import com.codahale.metrics.MetricRegistry;
import com.google.gerrit.metrics.CallbackMetric0;
class CallbackMetricImpl0<V> extends CallbackMetric0<V> implements CallbackMetricGlue {
@SuppressWarnings("unchecked")
static <V> V zeroFor(Class<V> valueClass) {
if (valueClass == Integer.class) {
return (V) Integer.valueOf(0);
} else if (valueClass == Long.class) {
return (V) Long.valueOf(0);
} else if (valueClass == Double.class) {
return (V) Double.valueOf(0);
} else if (valueClass == Float.class) {
return (V) Float.valueOf(0);
} else if (valueClass == String.class) {
return (V) "";
} else if (valueClass == Boolean.class) {
return (V) Boolean.FALSE;
} else {
throw new IllegalArgumentException("unsupported value type " + valueClass.getName());
}
}
private final DropWizardMetricMaker metrics;
private final MetricRegistry registry;
private final String name;
private volatile V value;
CallbackMetricImpl0(
DropWizardMetricMaker metrics, MetricRegistry registry, String name, Class<V> valueType) {
this.metrics = metrics;
this.registry = registry;
this.name = name;
this.value = zeroFor(valueType);
}
@Override
public void beginSet() {}
@Override
public void endSet() {}
@Override
public void set(V value) {
this.value = value;
}
@Override
public void remove() {
metrics.remove(name);
registry.remove(name);
}
@Override
public void register(Runnable trigger) {
registry.register(
name,
new com.codahale.metrics.Gauge<V>() {
@Override
public V getValue() {
trigger.run();
return value;
}
});
}
}
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