红帽全球峰会第 11 章 InitializingScoreTrend 类
您可以将 InitializingScoreTrend 类添加到优化算法中，以指定在附加变量初始化时分数的变化，并且已初始化的变量不会改变。某些优化算法，如结构 Heuristics 和 Exhaustive Search，在这些信息可用时更快地运行。
您可以为分数或每个分数级别分别指定以下趋势之一：
-
ANY（默认）：初始化额外变量可能会以正数或负面的方式改变分数。这种趋势不提供性能提升。 ONLY_UP(rare)：初始化额外变量只能以正的形式更改分数。ONLY_UP趋势需要以下条件：- 只有正限制。
- 初始化下一个变量无法匹配之前初始化的变量匹配的正约束。
ONLY_DOWN：初始化额外的变量只能更改分数。ONLY_DOWN需要以下条件：- 只有负限制。
- 初始化下一个变量无法匹配之前初始化的变量匹配的负约束。
大多数用例只有负限制。许多用例都有仅停机的 InitializingScoreTrend 类，如下例所示：
<scoreDirectorFactory>
<constraintProviderClass>org.optaplanner.examples.cloudbalancing.score.CloudBalancingConstraintProvider</constraintProviderClass>
<initializingScoreTrend>ONLY_DOWN</initializingScoreTrend>
</scoreDirectorFactory>
<scoreDirectorFactory>
<constraintProviderClass>org.optaplanner.examples.cloudbalancing.score.CloudBalancingConstraintProvider</constraintProviderClass>
<initializingScoreTrend>ONLY_DOWN</initializingScoreTrend>
</scoreDirectorFactory>另外，您还可以单独指定每个分数级别的趋势，如下例所示：
<scoreDirectorFactory>
<constraintProviderClass>org.optaplanner.examples.cloudbalancing.score.CloudBalancingConstraintProvider</constraintProviderClass>
<initializingScoreTrend>ONLY_DOWN/ONLY_DOWN</initializingScoreTrend>
</scoreDirectorFactory>
<scoreDirectorFactory>
<constraintProviderClass>org.optaplanner.examples.cloudbalancing.score.CloudBalancingConstraintProvider</constraintProviderClass>
<initializingScoreTrend>ONLY_DOWN/ONLY_DOWN</initializingScoreTrend>
</scoreDirectorFactory>
'%20d='M201.5%20305.5c-13.8%200-24.9-11.1-24.9-24.6%200-13.8%2011.1-24.9%2024.9-24.9%2013.6%200%2024.6%2011.1%2024.6%2024.9%200%2013.6-11.1%2024.6-24.6%2024.6zM504%20256c0%20137-111%20248-248%20248S8%20393%208%20256%20119%208%20256%208s248%20111%20248%20248zm-132.3-41.2c-9.4%200-17.7%203.9-23.8%2010-22.4-15.5-52.6-25.5-86.1-26.6l17.4-78.3%2055.4%2012.5c0%2013.6%2011.1%2024.6%2024.6%2024.6%2013.8%200%2024.9-11.3%2024.9-24.9s-11.1-24.9-24.9-24.9c-9.7%200-18%205.8-22.1%2013.8l-61.2-13.6c-3-.8-6.1%201.4-6.9%204.4l-19.1%2086.4c-33.2%201.4-63.1%2011.3-85.5%2026.8-6.1-6.4-14.7-10.2-24.1-10.2-34.9%200-46.3%2046.9-14.4%2062.8-1.1%205-1.7%2010.2-1.7%2015.5%200%2052.6%2059.2%2095.2%20132%2095.2%2073.1%200%20132.3-42.6%20132.3-95.2%200-5.3-.6-10.8-1.9-15.8%2031.3-16%2019.8-62.5-14.9-62.5zM302.8%20331c-18.2%2018.2-76.1%2017.9-93.6%200-2.2-2.2-6.1-2.2-8.3%200-2.5%202.5-2.5%206.4%200%208.6%2022.8%2022.8%2087.3%2022.8%20110.2%200%202.5-2.2%202.5-6.1%200-8.6-2.2-2.2-6.1-2.2-8.3%200zm7.7-75c-13.6%200-24.6%2011.1-24.6%2024.9%200%2013.6%2011.1%2024.6%2024.6%2024.6%2013.8%200%2024.9-11.1%2024.9-24.6%200-13.8-11-24.9-24.9-24.9z'/%3e%3c/svg%3e){kind=small}