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HealthReducer.java
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HealthReducer.java
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/*
* SonarQube
* Copyright (C) 2009-2017 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.server.health;
import java.util.function.BinaryOperator;
import java.util.stream.Stream;
import static org.sonar.server.health.Health.newHealthCheckBuilder;
public enum HealthReducer implements BinaryOperator<Health> {
INSTANCE;
/**
* According to Javadoc, {@link BinaryOperator} used in method
* {@link java.util.stream.Stream#reduce(Object, BinaryOperator)} is supposed to be stateless.
*
* But as we are sure this {@link BinaryOperator} won't be used on a Stream with {@link Stream#parallel()}
* feature on, we allow ourselves this optimisation.
*/
private final Health.Builder builder = newHealthCheckBuilder();
@Override
public Health apply(Health left, Health right) {
builder.clear();
builder.setStatus(worseOf(left.getStatus(), right.getStatus()));
left.getCauses().forEach(builder::addCause);
right.getCauses().forEach(builder::addCause);
return builder.build();
}
private static Health.Status worseOf(Health.Status left, Health.Status right) {
if (left == right) {
return left;
}
if (left.ordinal() > right.ordinal()) {
return left;
}
return right;
}
}