SolrLib

an easy to use solr client, that works embedded or with SolrServer and SolrCloud.

SolrLib aims to ease the use of Apache Solr within Java applications.

Often you want to internally use Solr - SolrLib helps launching up an embedded CoreContainer. The big advantage: You keep the core/collection configuration where it belongs - next to the code. If later, you want to switch to using an external Solr Server (classic or SolrCloud), you can do so without code-changes. SolrLib will even deploy/update your collections on the remote instances.

Usage

<dependency>
    <groupId>io.redlink.solrlib</groupId>
    <artifactId>solrlib</artifactId>
    <version>${VERSION}</version>
</dependency>

SolrLib is split up in several modules:

• solrlib-api
• solrlib-embedded
• solrlib-standalone
• solrlib-cloud

For convenience, there is also a solrlib-spring-boot-autoconfigure module for ease-of-use within Spring Boot environments.

Cores/collections are registered by using a SolrCoreDescriptor, e.g. a SimpleCoreDescriptor:

// Create a core-descriptor
CoreDescriptor myCore = new SimpleCoreDescriptor("my-core", Paths.get("/path/to/solr-conf"));

// Create SolrCoreContainer and register Core
EmbeddedCoreContainerConfiguration config = new EmbeddedCoreContainerConfiguration();
config.setHome(solrHome);
config.setDeleteOnShutdown(true);

SolrCoreContainer coreContainer = new EmbeddedCoreContainer(Collections.singleton(coreDescriptor), config, null);
coreContainer.initialize();

// ...

// retrieve a SolrClient
try (SolrClient solrClient = coreContainer.getSolrClient(myCore)) {
    solrClient.ping().getStatus();
}

Embedded Mode

When using solrlib-embedded, an embedded CoreContainer will be launched. There is no direct access to the Solr webservices or the admin-ui, you can retrieve an SolrClient to execute queries in your code.

Upon initialize(), all registered CoreDescriptors will be deployed. EmbeddedCoreContainerConfiguration.setDeleteOnShutdown controls if solr-home will be deleted upon shutdown.

Standalone Mode

When using solrlib-standalone, SolrLib connects to an external Solr server via http. If the home-directory is configured, the registered cores are copied there and registered via the Solr Core Admin API. The configuration flag deployCores chan further disable this.

Cloud Mode

In solrlib-cloud, SolrLib connects to an SolrCloud ensemble via the provided zookeeper connection string. If the configuration flag deployCores is set, all registered cores will be deployed to SolrCloud using CloudSolrClient.uploadConfig.

NOTE: adding runtime-libraries from the lib folder is currently not supported!

Spring Boot

To use SolrLib in a Spring Boot environment, add the following dependencies to your project:

<dependencies>
    <!-- Spring Boot Autoconfiguration for SolrLib -->
    <dependency>
        <groupId>io.redlink.solrlib</groupId>
        <artifactId>solrlib-spring-boot-autoconfigure</artifactId>
        <version>${solrlib.version}</version>
    </dependency>
    <!-- at least on implementation for runtime -->
    <dependency>
        <groupId>io.redlink.solrlib</groupId>
        <artifactId>solrlib-embedded</artifactId>
        <version>${solrlib.version}</version>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>io.redlink.solrlib</groupId>
        <artifactId>solrlib-standalone</artifactId>
        <version>${solrlib.version}</version>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>io.redlink.solrlib</groupId>
        <artifactId>solrlib-cloud</artifactId>
        <version>${solrlib.version}</version>
        <scope>runtime</scope>
    </dependency>
</dependencies>

The autoconfiguration checks solrlib with the following priority, the first one to match will be used:

1. SolrLib Cloud (requires solrlib.zk-connection to be set)
2. SolrLib Standalone (requires solrlib.base-url to be set)
3. SolrLib Embedded (fallback)

All supported configuration properties for SolrLib:

# Used by embedded and standalone
#      the ${SOLR_HOME} directory
solrlib.home = /path/to/solr/home
    
# This will trigger using solrlib-standalone if available on the classpath
#      base-url for all solr requests
solrlib.base-url = http://localhost:8983/solr
    
# This will trigger using solrlib-cloud if available on the classpath
#       ZooKeeper connection string
solrlib.zk-connection = zookeeper1:8121,zookeeper2:8121
    
# Only used by standalone and cloud
#      prefix for the remote collection names, 
#      to avoid name-clashes on shared servers. 
solrlib.collection-prefix = 
    
# Only relevant in cloud-mode
solrlib.max-shards-per-node = 1
        
# Only used by standalone and cloud
#      option to disable automatic configuration update/deployment
#      to remote servers. You might not have the karma to do so.
solrlib.deploy-cores = true
    
# Only used by embedded
#      option to delete the solrlib-home upon shutdown
solrlib.delete-on-shutdown = false

License

SolrLib is licensed under the Apache License 2.0.