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Date: Mon, 07 Feb 2005 12:27:21 -0500
From: "amigo@max3d.com" <amigo@max3d.com>
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To: Lucene Users List <lucene-user@jakarta.apache.org>
Subject: Re: PHP-Lucene Integration
References: <20050207085412.72718.qmail@web21322.mail.yahoo.com>
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Howdy,

For starters, compile and install the java bridge (and if necessary 
recompile PHP and Apache2) and make sure it works (there's a test php 
file supplied).

Then, here's a simplified part of my code, just to give you an example 
how it works. This is the part that does the searching, indexing is done 
in a similar way.

PHP:

...some code here for HTML page setup etc...

$lucene_dir = $GLOBALS["lucene_dir"];
java_set_library_path("/path/to/your/custom/lucene-classes.jar");
$obj = new Java("searcher"); // searcher is the custom written class 
that does actual searching and data output
$writer = new Java("java.io.StringWriter");
$obj->setWriter($writer);
$obj->initSearch($lucene_dir);
$obj->getQuery($query); // $query is the user supplied query from the 
HTML form, not visible here

// get the last exception
$e = java_last_exception_get();

if ($e) {
    // print error
    echo $e->toString();
} else {
    echo $writer->toString();
    $writer->flush();
    $writer->close();
}
java_last_exception_get();
// clear the exception
java_last_exception_clear();

---------------------------------

JAVA (custom written class located in the 
/path/to/your/custom/lucene-classes.jar):

import ...whatever is needed here for the class...

public class searcher {

   IndexReader reader     = null;
   IndexSearcher s        = null;          //the searcher used to 
open/search the index
   Query q                = null;          //the Query created by the 
QueryParser
   BooleanQuery query  = new BooleanQuery();
   Hits hits              = null;          //the search results
   
   public Writer out;

   public void setWriter(Writer out) {
                this.out=out;
   }

  public void initSearch(String indexName) throws Exception {
        try {
                File indexFile            = new File(indexName);
                Directory activeDir       = 
FSDirectory.getDirectory(indexFile, false);
                if(reader.isLocked(activeDir)) {
                        //out.write("Lucene index is locked, waiting 5 
sec.");
                        Thread.sleep(5000);
                }
                reader = IndexReader.open(indexName);
                s = new IndexSearcher(reader);
                //out.write("Index opened");
        } catch (Exception e) {
                throw new Exception(e.getMessage());
        }
   }

   public void getQuery(String queryString) throws Exception {

        int totalhits   = 0;
        Analyzer analyzer = new StandardAnalyzer();
       
        String[] queryFields = 
{"field1","field2","field3","field4","field5};
        float[] boostFields = {10, 6, 2, 1, 1};

        try {
                for ( int i = 0; i < queryFields.length; i++)
                {
                q = QueryParser.parse(queryString, queryFields[i], 
analyzer);
                if (boostFields[i] > 1)
                        q.setBoost(boostFields[i]);
                query.add(q, false, false);
                }
        } catch (ParseException e) {
                throw new Exception(e.getMessage());
        }

        try {
                hits = s.search(query);
        } catch (Exception e) {
                throw new Exception(e.getMessage());
        }
       
        totalhits = hits.length();

        if (totalhits == 0) {                             // if we find 
no hits, tell the user
                out.write("<br>I'm sorry I couldn't find your query: " + 
queryString);
        } else {

        for (int i = 0; i < totalhits; i++) {
            Document doc = hits.doc(i);
            String field1 = doc.get("field1");
            String field2 = doc.get("field2");
            String field3 = doc.get("field3");
            String field4 = doc.get("field4");
            String field5 = doc.get("field5");
            out.write("Field1: " + field1 + ", Field2: " + field2 + ", 
Field3: " + field3 + ", Field4: " + field4 + ", Field5: " + field5 + 
"<br>");
        }
  }
}


Sanyi said the following on 2/7/2005 3:54 AM:

>Hi!
>
>Can you please explain how did you implement the java and php part to let them communicate through
>this bridge?
>The brige's project summary talks about "java "application-server" or a dedicated java process"
>and I'm not into Java that much.
>Currenty I'm using a self-written command-line search program and it outputs its results to the
>standard output.
>I guess your solution must be better ;)
>
>If the "communication parts" of your code aren't top secret, can you please share them with me/us?
>
>Regards,
>Sanyi
>
>
>
>		
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