com.github.dynamicextensionsalfresco.osgi.BundleDependencies.kt Maven / Gradle / Ivy

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Adds an OSGi container to alfresco repository supporting dynamic code reloading, classpath isolation and a bunch of other useful features

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package com.github.dynamicextensionsalfresco.osgi

import org.osgi.framework.Bundle

/**
 * Sort a list of bundles by their dependency graph.
 * Bundles without or satisfied dependencies come first.
 *
 * @author Laurent Van der Linden.
 */
public object BundleDependencies : DependencyMetadataProvider {
    fun sortByDependencies(bundles: List): List {
        if (bundles.size == 1) {
            return bundles
        }

        val descriptors = bundles.map { BundleDescriptor(it) }

        return DependencySorter.sort(descriptors, this).map { it.bundle }
    }

    override fun imports(item: BundleDescriptor): Collection {
        return item.manifest.importPackage.importedPackages.map { it.packageName }
    }

    override fun exports(item: BundleDescriptor): Collection {
        return item.manifest.exportPackage.exportedPackages.map { it.packageName }
    }

    override fun allowCircularReferences(): Boolean{
        // SLF4J has a circular reference
        return true;
    }

    /**
     * Cache the manifest
     */
    data class BundleDescriptor(val bundle: Bundle) {
        val manifest = bundle.manifest

        override fun toString(): String {
            return "%3d: %s".format(bundle.bundleId, bundle.symbolicName)
        }
    }
}