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ArtifactVersionsCache.java
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ArtifactVersionsCache.java
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package org.codehaus.mojo.versions.api;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import java.util.function.BiFunction;
import org.apache.commons.lang3.tuple.Pair;
/**
* Utility providing a cached {@link ArtifactVersions#getNewestUpdate(Optional)} API
*/
public class ArtifactVersionsCache
{
private BiFunction<AbstractVersionDetails, Optional<Segment>, ?> cachedFunction;
private Map<Pair<? extends AbstractVersionDetails, Optional<Segment>>, Object> updateCache = new HashMap<>();
/**
* Constructs a new instance given the concrete function for obtaining the details
*
* @param cachedFunction reference to the function computing the required information
*/
public ArtifactVersionsCache( BiFunction<AbstractVersionDetails, Optional<Segment>, ?>
cachedFunction )
{
this.cachedFunction = cachedFunction;
}
/**
* Returns the required information for the given {@link ArtifactVersions} object and the given update scope.
* If the information is already present in cache, the cached version is returned. Otherwise,
* the {@code artifactVersions} object is queried and the response is cached.
*
* @param <V> concrete implementation of {@linkplain AbstractVersionDetails}
* @param <R> return type of the cached function
* @param artifactVersions {@linkplain ArtifactVersions} object referring to the given dependency
* @param updateScope update scope
* @return last retrieved update information
*/
@SuppressWarnings( "unchecked" )
public <V extends AbstractVersionDetails, R> R get( V artifactVersions,
Optional<Segment> updateScope )
{
return (R) updateCache.computeIfAbsent( Pair.of( artifactVersions, updateScope ),
pair -> cachedFunction.apply( pair.getLeft(), pair.getRight() ) );
}
}