org.basepom.mojo.dvc.StrategyCache Maven / Gradle / Ivy

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The dependency-versions-check plugin verifies that all resolved versions of artifacts are at least the versions specified by the project dependencies. The Maven dependency resolution process will substitute versions for the different artifacts in a dependency tree and sometimes chooses incompatible versions which leads to difficult to detect problems. This plugin resolves all dependencies and collects any requested version. It evaluates whether the resolved versions are compatible to the requested versions and reports possible conflicts.

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/*
 * 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 org.basepom.mojo.dvc;

import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;

import org.basepom.mojo.dvc.model.ResolverDefinition;
import org.basepom.mojo.dvc.strategy.Strategy;
import org.basepom.mojo.dvc.strategy.StrategyProvider;

import java.util.Arrays;
import java.util.Map;
import java.util.concurrent.ExecutionException;

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.google.common.collect.ImmutableMap;

public final class StrategyCache {

    /**
     * name of an artifact to  version resolution strategy.
     */
    private final Cache resolverCache = CacheBuilder.newBuilder().concurrencyLevel(10).build();

    private final ImmutableMap resolverPatterns;
    private final Strategy defaultStrategy;

    StrategyCache(final StrategyProvider strategyProvider, final ResolverDefinition[] resolvers, final String defaultStrategyName) {
        checkNotNull(strategyProvider, "strategyProvider is null");
        checkNotNull(resolvers, "resolvers is null");
        checkNotNull(defaultStrategyName, "defaultStrategyName is null");

        this.defaultStrategy = strategyProvider.forName(defaultStrategyName);
        checkState(defaultStrategy != null, "Could not locate default version strategy '%s'", defaultStrategyName);

        final ImmutableMap.Builder builder = ImmutableMap.builder();
        Arrays.stream(resolvers).forEach(r -> {
            final Strategy strategy = strategyProvider.forName(r.getStrategy());
            checkState(strategy != null, "Could not locate version strategy %s! Check for typos!", r.getStrategy());
            r.getIncludes().forEach(include -> builder.put(include, strategy));
        });
        this.resolverPatterns = builder.build();
    }

    public Strategy forQualifiedName(final QualifiedName name) {
        checkNotNull(name, "name is null");
        try {
            return resolverCache.get(name, () -> {
                for (final Map.Entry entry : resolverPatterns.entrySet()) {
                    if (entry.getKey().matches(name)) {
                        return entry.getValue();
                    }
                }
                return defaultStrategy;
            });
        } catch (ExecutionException e) {
            // ignore, never happens.
            return defaultStrategy;
        }
    }
}