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package edu.ucsb.nceas.metacat.dataone.hazelcast;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.HashSet;
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import java.util.Hashtable;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import com.hazelcast.core.MapLoader;
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import edu.ucsb.nceas.metacat.IdentifierManager;
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import edu.ucsb.nceas.metacat.McdbDocNotFoundException;
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import edu.ucsb.nceas.metacat.properties.PropertyService;
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import edu.ucsb.nceas.metacat.shared.ServiceException;
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import edu.ucsb.nceas.utilities.FileUtil;
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import edu.ucsb.nceas.utilities.PropertyNotFoundException;
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/**
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* MapLoader implementation for a hazelcast hzObjectPath. This class is called
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* when the IMap get methods needs to refresh against the persistent data-store.
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* The use case for this class is to communicate the filepath between JVMs on
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* the same machine, specifically between the metacat instance and the d1_indexer.
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*
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* d1_indexer will get Identifiers from elsewhere, but use this class to get
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* the paths to their associated files. The getAllKeys() method will
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* return null in a live setting, to avoid possibly expensive preloading
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*
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* @author rnahf
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*/
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public class ObjectPathMap implements MapLoader<String, String> {
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private static IdentifierManager im;
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private static String dataPath;
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private static String metadataPath;
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/**
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* creates an ObjectPathMap
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*/
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public ObjectPathMap() {
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try {
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PropertyService ps = PropertyService.getInstance();
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dataPath = PropertyService.getProperty("application.datafilepath");
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metadataPath = PropertyService.getProperty("application.documentfilepath");
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} catch (PropertyNotFoundException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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} catch (ServiceException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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im = IdentifierManager.getInstance();
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}
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/*
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* Metadata is stored in a different place on the filesystem than
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* the data. The doctype value for metadata can vary, but for data
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* is always 'BIN', so using a simple if-then-else to separate
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*/
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private String pathToDocid(String localid) throws McdbDocNotFoundException
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{
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Hashtable<String, Object> ht = im.getDocumentInfo(localid);
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if (ht.get("doctype").equals("BIN")) {
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return dataPath + FileUtil.getFS() + localid;
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} else {
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return metadataPath + FileUtil.getFS() + localid;
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}
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}
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/**
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* Implementation of hazelcast MapLoader interface method.
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* For the provided Identifier (as key), returns the path to the
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* document on the local filesystem. Returns null if it can't
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* create the path.
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*/
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@Override
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public String load(String key)
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{
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String docid = null;
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String path = null;
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try {
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docid = im.getLocalId(key);
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path = pathToDocid(docid);
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} catch (McdbDocNotFoundException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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return null;
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}
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return path;
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}
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/**
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* Implementation of hazelcast MapLoader interface method. This method loads
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* mappings for all Identifiers in the parameters. Any Identifier not found
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* is not included in the resulting map.
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*/
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@Override
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public Map<String, String> loadAll(Collection<String> identifiers) {
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Hashtable<String,String> map = new Hashtable<String,String>();
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for (String id : identifiers) {
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try {
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String docid = im.getLocalId(id);
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map.put(id, pathToDocid(docid));
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} catch (McdbDocNotFoundException e) {
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// TODO should the map load an empty path instead of
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// leaving out the entire entry?
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e.printStackTrace();
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}
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}
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return map;
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}
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/**
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* Return the full set of guids in the local metacat repository as
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* dataone Identifiers.
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*
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* (Hazelcast allows avoiding pre-loading by returning NULL, so will
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* do this to avoid pre-loading a very long list unnecessarily)
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*/
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@Override
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public Set<String> loadAllKeys()
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{
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return null;
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// List<String> guids = im.getAllGUIDs();
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//
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// Set<String> set = Collections.synchronizedSet(new HashSet<String>());
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// for (String guid : guids) {
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// set.add(guid);
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// }
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// return set;
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}
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}
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