com.hazelcast.internal.metrics.impl.DoubleGaugeImpl Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2016, Hazelcast, Inc. All Rights Reserved.
*
* 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.hazelcast.internal.metrics.impl;
import com.hazelcast.internal.metrics.DoubleGauge;
import com.hazelcast.internal.metrics.DoubleProbeFunction;
import com.hazelcast.internal.metrics.LongProbeFunction;
import com.hazelcast.internal.metrics.ProbeFunction;
class DoubleGaugeImpl extends AbstractGauge implements DoubleGauge {
private static final double DEFAULT_VALUE = 0d;
DoubleGaugeImpl(MetricsRegistryImpl metricsRegistry, String name) {
super(metricsRegistry, name);
}
@Override
public double read() {
ProbeInstance probeInstance = getProbeInstance();
ProbeFunction function = null;
Object source = null;
if (probeInstance != null) {
function = probeInstance.function;
source = probeInstance.source;
}
if (function == null || source == null) {
clearProbeInstance();
return DEFAULT_VALUE;
}
try {
if (function instanceof LongProbeFunction) {
LongProbeFunction longFunction = (LongProbeFunction) function;
return longFunction.get(source);
} else {
DoubleProbeFunction doubleFunction = (DoubleProbeFunction) function;
return doubleFunction.get(source);
}
} catch (Exception e) {
metricsRegistry.logger.warning("Failed to access probe:" + name, e);
return DEFAULT_VALUE;
}
}
}