蓝图OSGi是一个向OSGi引入依赖注入并为OSGi包提供使用和提供服务的简单机制的规范。
在 OSGi 蓝图中使用 Camel JCachePolicy 和 Caffeine
我想在 OSGi Blueprint 中为 Caffeine 缓存应用camel-jcache 路由策略。 当我向蓝图中添加缓存配置时，如下所示： 我想在 OSGi 蓝图中为咖啡因缓存应用 camel-jcache 路由策略。 当我向蓝图中添加缓存配置时，如下所示： <reference id="cachingProvider" interface="javax.cache.spi.CachingProvider"/> <bean id="caffeineCacheManager" factory-ref="cachingProvider" factory-method="getCacheManager"/> <bean id="caffeineCache" factory-ref="caffeineCacheManager" factory-method="getCache"> <!-- see src/main/resources/application.conf for cache expiration policy --> <argument value="konfig-cache"/> </bean> <bean id="jCachePolicy" class="org.apache.camel.component.jcache.policy.JCachePolicy"> <property name="cache" ref="caffeineCache"/> <property name="keyExpression"> <bean class="org.apache.camel.model.language.SimpleExpression"> <property name="expression" value="${exchangeProperty.typNr}"/> </bean> </property> </bean> 然后蓝图包无法在 NullPointerException 处以 BeanRecipe.setProperties 开头。 我能够将其追溯到类加载器问题。我要求一个名为 konfig-cache 的缓存，但该缓存的配置位于捆绑资源中的文件 application.conf 中（Typesafe Config 中自定义配置的默认位置）。 OSGi 运行时无法使用默认类加载器加载该文件。 如何定义 Caffeine 底层 Typesafe Config 应该使用的类加载器来在 Blueprint 包的资源中定位配置文件？ pom.xml中相关依赖： <dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-jsonpath</artifactId> <version>${camel.version}</version> </dependency> <dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-jcache</artifactId> <version>${camel.version}</version> </dependency> <dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-caffeine</artifactId> <version>${camel.version}</version> </dependency> <dependency> <groupId>com.github.ben-manes.caffeine</g <artifactId>jcache</artifactId> <version>2.9.2</version> </dependency> 在我的 Karaf feature.xml: <feature version="${camel.version}">camel-jcache</feature> <feature version="${camel.version}">camel-caffeine</feature> <bundle>mvn:com.github.ben-manes.caffeine/jcache/2.9.2</bundle> <bundle>mvn:com.typesafe/config/1.4.2</bundle> 最后，我的src/main/resources/application.conf: # Configuration for camel-caffeine in HOCON format # see https://github.com/lightbend/config/blob/master/HOCON.md#hocon-human-optimized-config-object-notation # see https://github.com/lightbend/config#standard-behavior # see https://github.com/ben-manes/caffeine/blob/master/jcache/src/main/resources/reference.conf # see example https://github.com/ben-manes/caffeine/blob/master/jcache/src/test/resources/application.conf caffeine.jcache { konfig-cache { key-type = java.lang.String value-type = java.lang.Object # The eviction policy for automatically removing entries from the cache policy { # The expiration threshold before lazily evicting an entry. This single threshold is reset on # every operation where a duration is specified. As expected by the specification, if an entry # expires but is not accessed and no resource constraints force eviction, then the expired # entry remains in place. lazy-expiration { # The duration before a newly created entry is considered expired. If set to 0 then the # entry is considered to be already expired and will not be added to the cache. May be # a time duration or "eternal" to indicate no expiration. creation = 60m # The duration before a updated entry is considered expired. If set to 0 then the entry is # considered immediately expired. May be a time duration, null to indicate no change, or # "eternal" to indicate no expiration. update = 60m # The duration before a read of an entry is considered expired. If set to 0 then the entry # is considered immediately expired. May be a time duration, null to indicate no change, or # "eternal" to indicate no expiration. access = null } # The expiration thresholds before eagerly evicting an entry. These settings correspond to the # expiration supported natively by Caffeine where expired entries are collected during # maintenance operations. #eager-expiration { # Specifies that each entry should be automatically removed from the cache once a fixed # duration has elapsed after the entry's creation, or the most recent replacement of its # value. This setting cannot be combined with the variable configuration. #after-write = null # Specifies that each entry should be automatically removed from the cache once a fixed # duration has elapsed after the entry's creation, the most recent replacement of its value, # or its last read. Access time is reset by all cache read and write operation. This setting # cannot be combined with the variable configuration. #after-access = null # The expiry class to use when calculating the expiration time of cache entries. This # setting cannot be combined with after-write or after-access configurations. #variable = null } # The threshold before an entry is eligible to be automatically refreshed when the first stale # request for an entry occurs. This setting is honored only when combined with the # read-through configuration. #refresh { # Specifies that active entries are eligible for automatic refresh once a fixed duration has # elapsed after the entry's creation or the most recent replacement of its value. #after-write = 30s #} # The maximum bounding of the cache based upon its logical size maximum { # The maximum number of entries that can be held by the cache. This setting cannot be # combined with the weight configuration. size = 10 } } } CaffeineCachingProvider 允许将类加载器传递给 CachingProvider.getCacheManager(URI uri, ClassLoader classLoader)。 预期的 URI 只是 CaffeineCachingProvider 的 FQCN。 现在是类加载器。在 OSGi 蓝图中，我们可以确定蓝图包的类加载器并将其传递给 getCacheManager。蓝图规范定义了许多具有预定义参考名称的环境管理器，其中包括蓝图包本身，其名称为blueprintBundle。 因为无论如何我们都在使用 Camel，所以我们可以使用 Camel 的 BundleDelegatingClassLoader 来简化对包的类加载器的访问： <bean id="caffeineCacheManager" factory-ref="cachingProvider" factory-method="getCacheManager"> <argument value="com.github.benmanes.caffeine.jcache.spi.CaffeineCachingProvider"/> <argument> <bean class="org.apache.camel.core.osgi.utils.BundleDelegatingClassLoader"> <argument ref="blueprintBundle"/> </bean> </argument> </bean>
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