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Merge pull request #302 from tsegismont/jira/HWKMETRICS-206
HWKMETRICS-206 Implementation of statistics computation based on RxJava
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core/metrics-core-api/src/main/java/org/hawkular/metrics/core/api/BucketPoint.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| /* | ||
| * Copyright 2014-2015 Red Hat, Inc. and/or its affiliates | ||
| * and other contributors as indicated by the @author tags. | ||
| * | ||
| * 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 org.hawkular.metrics.core.api; | ||
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|
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| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.function.BiFunction; | ||
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|
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| /** | ||
| * Statistics for metric data in a time range (bucket). | ||
| * | ||
| * @author Thomas Segismont | ||
| */ | ||
| public abstract class BucketPoint { | ||
| private final long start; | ||
| private final long end; | ||
|
|
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| protected BucketPoint(long start, long end) { | ||
| this.start = start; | ||
| this.end = end; | ||
| } | ||
|
|
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| /** | ||
| * @return start of the time range | ||
| */ | ||
| public long getStart() { | ||
| return start; | ||
| } | ||
|
|
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| /** | ||
| * @return end of the time range | ||
| */ | ||
| public long getEnd() { | ||
| return end; | ||
| } | ||
|
|
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| /** | ||
| * @return returns true if there was no data to build this bucket | ||
| */ | ||
| public abstract boolean isEmpty(); | ||
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| /** | ||
| * Converts bucket points indexed by start time into a list, ordered by start time. Blanks will be filled with | ||
| * empty bucket points. | ||
| */ | ||
| public static <T extends BucketPoint> List<T> toList(Map<Long, T> pointMap, Buckets buckets, BiFunction<Long, | ||
| Long, T> emptyBucketFactory) { | ||
| List<T> result = new ArrayList<>(buckets.getCount()); | ||
| for (int index = 0; index < buckets.getCount(); index++) { | ||
| long from = buckets.getBucketStart(index); | ||
| T bucketPoint = pointMap.get(from); | ||
| if (bucketPoint == null) { | ||
| long to = from + buckets.getStep(); | ||
| bucketPoint = emptyBucketFactory.apply(from, to); | ||
| } | ||
| result.add(bucketPoint); | ||
| } | ||
| return result; | ||
| } | ||
| } |
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