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FeatureDetector.java
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FeatureDetector.java
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/*-
* ========================LICENSE_START=================================
* flyway-core
* ========================================================================
* Copyright (C) 2010 - 2024 Red Gate Software Ltd
* ========================================================================
* 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.
* =========================LICENSE_END==================================
*/
package org.flywaydb.core.internal.util;
import lombok.CustomLog;
import java.util.ServiceLoader;
import java.util.stream.StreamSupport;
@CustomLog
public final class FeatureDetector {
private final ClassLoader classLoader;
private Boolean apacheCommonsLoggingAvailable;
private Boolean log4J2Available;
private Boolean slf4jAvailable;
private Boolean jbossVFSv2Available;
private Boolean jbossVFSv3Available;
private Boolean osgiFrameworkAvailable;
private Boolean awsAvailable;
private Boolean gcsAvailable;
public FeatureDetector(ClassLoader classLoader) {
this.classLoader = classLoader;
}
public boolean isApacheCommonsLoggingAvailable() {
if (apacheCommonsLoggingAvailable == null) {
apacheCommonsLoggingAvailable = ClassUtils.isPresent("org.apache.commons.logging.Log", classLoader);
}
return apacheCommonsLoggingAvailable;
}
public boolean isLog4J2Available() {
if (log4J2Available == null) {
log4J2Available = ClassUtils.isPresent("org.apache.logging.log4j.Logger", classLoader);
}
return log4J2Available;
}
public boolean isSlf4jAvailable() {
if (slf4jAvailable == null) {
// We need to ensure there's an actual implementation; AWS SDK pulls in the Logger interface but doesn't
// provide any implementation, causing SLF4J to drop what we want to be console output on the floor.
// Versions up to 1.7 have a StaticLoggerBinder
slf4jAvailable = ClassUtils.isPresent("org.slf4j.Logger", classLoader)
&& ClassUtils.isPresent("org.slf4j.impl.StaticLoggerBinder", classLoader)
&& !StreamSupport.stream(ServiceLoader.load(org.slf4j.Logger.class, classLoader)
.spliterator(), false).allMatch(logger -> logger instanceof org.slf4j.helpers.NOPLogger);
// Versions 1.8 and later use a ServiceLocator to bind to the implementation
slf4jAvailable |= ClassUtils.isImplementationPresent("org.slf4j.spi.SLF4JServiceProvider", classLoader);
}
return slf4jAvailable;
}
public boolean isJBossVFSv2Available() {
if (jbossVFSv2Available == null) {
jbossVFSv2Available = ClassUtils.isPresent("org.jboss.virtual.VFS", classLoader);
LOG.debug("JBoss VFS v2 available: " + jbossVFSv2Available);
}
return jbossVFSv2Available;
}
public boolean isJBossVFSv3Available() {
if (jbossVFSv3Available == null) {
jbossVFSv3Available = ClassUtils.isPresent("org.jboss.vfs.VFS", classLoader);
LOG.debug("JBoss VFS v3 available: " + jbossVFSv3Available);
}
return jbossVFSv3Available;
}
public boolean isOsgiFrameworkAvailable() {
if (osgiFrameworkAvailable == null) {
// Use this class' classloader to detect the OSGi framework
ClassLoader classLoader = FeatureDetector.class.getClassLoader();
osgiFrameworkAvailable = ClassUtils.isPresent("org.osgi.framework.Bundle", classLoader);
LOG.debug("OSGi framework available: " + osgiFrameworkAvailable);
}
return osgiFrameworkAvailable;
}
public boolean isAwsAvailable() {
if (awsAvailable == null) {
awsAvailable = ClassUtils.isPresent("software.amazon.awssdk.services.s3.S3Client", classLoader);
LOG.debug("AWS SDK available: " + awsAvailable);
}
return awsAvailable;
}
public boolean isGCSAvailable() {
if (gcsAvailable == null) {
gcsAvailable = ClassUtils.isPresent("com.google.cloud.storage.Storage", classLoader);
LOG.debug("Google Cloud Storage available: " + gcsAvailable);
}
return gcsAvailable;
}
}