com.datastax.oss.driver.internal.core.util.DefaultDependencyChecker Maven / Gradle / Ivy
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/*
* 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.
*/
package com.datastax.oss.driver.internal.core.util;
import java.util.concurrent.ConcurrentHashMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A checker for the presence of various {@link Dependency} instances at runtime. Predicate tests
* for Graal substitutions should NOT use this class; see {@link GraalDependencyChecker} for more
* information.
*/
public class DefaultDependencyChecker {
private static final Logger LOG = LoggerFactory.getLogger(DefaultDependencyChecker.class);
private static final ConcurrentHashMap CACHE = new ConcurrentHashMap<>();
/**
* Return true iff we can find all classes for the dependency on the classpath, false otherwise
*
* @param dependency the dependency to search for
* @return true if the dependency is available, false otherwise
*/
public static boolean isPresent(Dependency dependency) {
try {
return CACHE.computeIfAbsent(
dependency,
(dep) -> {
for (String classNameToTest : dependency.classes()) {
// Always use the driver class loader, assuming that the driver classes and
// the dependency classes are either being loaded by the same class loader,
// or – as in OSGi deployments – by two distinct, but compatible class loaders.
if (Reflection.loadClass(null, classNameToTest) == null) {
return false;
}
}
return true;
});
} catch (Exception e) {
LOG.warn("Unexpected exception when checking for dependency " + dependency, e);
return false;
}
}
}