itech9

From http://stackoverflow.com/questions/1229780/question-about-lru-cache-implementation-in-java

import java.util.Map;
import java.util.LinkedHashMap;

public class t1 {

    final int MAX_ENTRIES = 2;

    Map cache = new LinkedHashMap(MAX_ENTRIES+1, .75F, true) {
        // This method is called just after a new entry has been added
        public boolean removeEldestEntry(Map.Entry eldest) {
	    System.out.println("eldest: " + eldest.getKey() + "=" + eldest.getValue());
            return size() > MAX_ENTRIES;
        }
    };

    public void cacheAdd(String pkey, String pstr) {
        // Add to cache
        cache.put(pkey, pstr);
    }

    public static void main(String[] args) {
        t1 ot1 = new t1();
        ot1.cacheAdd(”k1″, “str1″);
        ot1.cacheAdd(”k2″, “str2″);
        ot1.cacheAdd(”k3″, “str3″);
        ot1.cacheAdd(”k4″, “str4″);
    }

    /* –
// Get object
Object o = cache.get(key);
if (o == null && !cache.containsKey(key)) {
    // Object not in cache. If null is not a possible value in the cache,
    // the call to cache.contains(key) is not needed
}

// If the cache is to be used by multiple threads,
// the cache must be wrapped with code to synchronize the methods
cache = (Map)Collections.synchronizedMap(cache);
– */

}

Also, see http://codeidol.com/java/javagenerics/Maps/Implementing-Map/

“requestHandler” notes for the solrconfig.xml file:

– Fields are defined here:

<str name=”hl.fl”>text features name</str>

– Field values are defined here:

<str name=”f.name.hl.alternateField”>name</str>
<str name=”f.name.hl.fragsize”>0</str>
<str name=”f.text.hl.fragmenter”>regex</str>

– The alternate ‘nutch’ configuration is:

(See http://www.lucidimagination.com/blog/2009/03/09/nutch-solr/)

– Fields:

<str name=”hl.fl”>title url content</str>

– Field values:

<str name=”f.content.hl.fragmenter”>regex</str>
<str name=”f.title.hl.alternateField”>title</str>
<str name=”f.title.hl.fragsize”>0</str>
<str name=”f.url.hl.alternateField”>url</str>
<str name=”f.url.hl.fragsize”>0</str>

– To map a parser to a file type,

– Map mime type for the file to a plugin in conf/parse-plugins.xml .

– Define new mime type for the file in conf/mime-types.xml .