Example usage for org.apache.solr.util VersionedFile getLatestFile

Introduction

In this page you can find the example usage for org.apache.solr.util VersionedFile getLatestFile.

Prototype

public static InputStream getLatestFile(String dirName, String fileName) throws FileNotFoundException 

Source Link

Usage

From source file:com.billiger.solr.handler.component.QLTBComponent.java

License:Apache License

/**
 * Get QLTB map for the given IndexReader.
 *
 * If the QLTB map is located in the conf/ directory, it is independent
 * of the IndexReader and reloaded only during a core reload.
 * If, however, QLTB data is read from ZooKeeper or the data/ directory,
 * it is reloaded for each new IndexReader via the core's resource loader.
 *
 * @return QLTB map for the given IndexReader.
 */// www .j ava2s .co m
private Map<String, List<Query>> getQLTBMap(final IndexReader reader, final SolrCore core) throws Exception {
    Map<String, List<Query>> map = null;
    synchronized (qltbCache) {
        map = qltbCache.get(null); // Magic "null" key for data from conf/
        if (map != null) {
            // QLTB data from the conf/ directory, reader-independent.
            return map;
        }
        map = qltbCache.get(reader);
        if (map == null) {
            // No QLTB map for this reader yet, load it from ZooKeeper or
            // the data/ directory.
            log.info("load QLTB map for new IndexReader");
            String qltbFile = initArgs.get(QLTB_FILE);
            if (qltbFile == null) {
                throw new SolrException(SolrException.ErrorCode.SERVER_ERROR,
                        "QLTBComponent must specify argument: " + QLTB_FILE);
            }
            Config cfg;
            ZkController zkController = core.getCoreDescriptor().getCoreContainer().getZkController();
            if (zkController != null) {
                // We're running under ZooKeeper control...
                cfg = new Config(core.getResourceLoader(), qltbFile, null, null);
            } else {
                // No ZooKeeper, use data/ directory
                InputStream is = VersionedFile.getLatestFile(core.getDataDir(), qltbFile);
                cfg = new Config(core.getResourceLoader(), qltbFile, new InputSource(is), null);
            }
            map = loadQLTBMap(cfg, core);
            qltbCache.put(reader, map);
        }
        return map;
    }
}

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