/**
 * Copyright 2013 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.servo.monitor;

import com.google.common.base.Objects;
import com.google.common.base.Preconditions;
import java.util.Arrays;
import java.util.concurrent.TimeUnit;

/**
 * Configuration options for a {@link com.netflix.servo.monitor.BucketTimer}
 * <p>
 * By default we publish count (number of times the timer was executed), totalTime, and
 * the counts and times for the following buckets: 0ms, 100ms, 200ms, 500ms 1000ms 2000ms, 3000ms, 5000ms
 */
public final class BucketConfig {

    public static class Builder {
        private TimeUnit timeUnit = TimeUnit.MILLISECONDS;
        private long[] buckets = null;

        /**
         * Sets the timeunit for the buckets.
         */
        public Builder withTimeUnit(TimeUnit timeUnit) {
            this.timeUnit = Preconditions.checkNotNull(timeUnit);
            return this;
        }

        /**
         * Sets the buckets to be used.
         *
         * <p><ul>
         * <li>Each bucket must be unique.
         * <li>Buckets must be in ascending order (smallest-to-largest).
         * <li>All bucket counts will be namespaced under the "servo.bucket" tag.
         * <li>Buckets are incremented in the following way: Given a set of n
         * ordered buckets, let n1 = the first bucket. If a given duration is
         * less than or equal to n1, the counter for n1 is incremented; else
         * perform the same check on n2, n3, etc. If the duration is greater
         * the largest bucket, it is added to the 'overflow' bucket. The overflow
         * bucket is automatically created.
         */
        public Builder withBuckets(long[] buckets) {
            Preconditions.checkNotNull(buckets, "buckets cannot be null");

            this.buckets = Arrays.copyOf(buckets, buckets.length);
            Preconditions.checkArgument(this.buckets.length > 0, "buckets cannot be empty");
            Preconditions.checkArgument(isAscending(this.buckets), "buckets must be in ascending order");
            return this;
        }

        private boolean isAscending(long[] values) {
            long last = values[0];
            for (int i = 1; i < values.length; i++) {
                if (values[i] <= last) {
                    return false;
                }
                last = values[i];
            }
            return true;
        }

        public BucketConfig build() {
            return new BucketConfig(this);
        }
    }

    private final TimeUnit timeUnit;
    private final long[] buckets;

    private BucketConfig(Builder builder) {
        this.timeUnit = builder.timeUnit;
        this.buckets = Arrays.copyOf(builder.buckets, builder.buckets.length);
    }

    /**
     * Get the TimeUnit of the buckets.
     */
    public TimeUnit getTimeUnit() {
        return timeUnit;
    }

    /**
     * Returns an abbreviation for the Bucket's TimeUnit.
     */
    public String getTimeUnitAbbreviation() {
        switch (timeUnit) {
            case DAYS: return "day";
            case HOURS: return "hr";
            case MICROSECONDS: return "μs";
            case MILLISECONDS: return "ms";
            case MINUTES: return "min";
            case NANOSECONDS: return "ns";
            case SECONDS: return "s";
            default: return "unkwn";
        }
    }

    /**
     * Get a copy of the array that holds the bucket values.
     */
    public long[] getBuckets() {
        return Arrays.copyOf(buckets, buckets.length);
    }

    /** {@inheritDoc} */
    @Override
    public String toString() {
        return Objects.toStringHelper(this)
                .add("timeUnit", timeUnit)
                .add("buckets", buckets)
                .toString();
    }

    /** {@inheritDoc} */
    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof BucketConfig)) return false;

        final BucketConfig that = (BucketConfig) o;

        if (timeUnit != that.timeUnit) return false;
        if (!Arrays.equals(buckets, that.buckets)) return false;

        return true;
    }

    /** {@inheritDoc} */
    @Override
    public int hashCode() {
        int result = timeUnit.hashCode();
        result = 31 * result + Arrays.hashCode(buckets);
        return result;
    }
}

@@ -3667,9 +3667,14 @@
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Replace unicode char with \u representation