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/**
* Copyright 2017 VMware, 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
*
* https://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 io.micrometer.cloudwatch2;
import software.amazon.awssdk.services.cloudwatch.model.MetricDatum;
/**
* Utilities for CloudWatch registry
*/
final class CloudWatchUtils {
/**
* Minimum allowed value as specified by
* {@link MetricDatum#value()}
*/
private static final double MINIMUM_ALLOWED_VALUE = 8.515920e-109;
/**
* Maximum allowed value as specified by
* {@link MetricDatum#value()}
*/
private static final double MAXIMUM_ALLOWED_VALUE = 1.174271e+108;
private CloudWatchUtils() {
}
/**
* Clean up metric to be within the allowable range as specified in
* {@link MetricDatum#value()}
*
* @param value unsanitized value
* @return value clamped to allowable range
*/
static double clampMetricValue(double value) {
// Leave as is and let the SDK reject it
if (Double.isNaN(value)) {
return value;
}
double magnitude = Math.abs(value);
if (magnitude == 0) {
// Leave zero as zero
return 0;
}
// Non-zero magnitude, clamp to allowed range
double clampedMag = Math.min(Math.max(magnitude, MINIMUM_ALLOWED_VALUE), MAXIMUM_ALLOWED_VALUE);
return Math.copySign(clampedMag, value);
}
}