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The driver API for engineblock; Provides the interfaces needed to build drivers that can be loaded by engineblock core

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/*
 *
 *    Copyright 2016 jshook
 *    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 io.engineblock.metrics;

/**
 * 

Allow a DeltaHistogram to have attached metrics that also get a copy of * any input data.

* *

Terms

*
    *
  • Attaching metric - the original metric which maintains the attached metric.
  • *
  • Attached metric - the "shadow" metric which receives the same input as the * original metric.
  • *
* *

Implementing classes should reproduce their configuration, but not their content. * This means that attached metrics will receive content from the time they are attached, * and wil not see previous content. Attaching metrics are responsible for the creation * and ownership of the attached metrics.

* *

Implementations of the attaching metric should ensure that attached metrics * all receive the same data.

* *

The number of metrics that are allowed to be chained is implementation dependent.

* *

Implementations should ensure that any naming fields are marked differently so that * the attached metric does not have the exact same name as the attaching metric.

*/ public interface HdrDeltaHistogramAttachment extends HdrDeltaHistogramProvider { /** * Attach a metric. * @return the attached metric, after adding to the mirrors for the metric. */ public HdrDeltaHistogramProvider attachHdrDeltaHistogram(); }




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