how to perform a search and limit the time that the search takes : Search « JNDI LDAP « Java

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how to perform a search and limit the time that the search takes

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import java.util.Hashtable;

import javax.naming.Context;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.TimeLimitExceededException;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;

/**
 * Demonstrates how to perform a search and limit the time that the search
 * takes.
 * 
 * usage: java SearchTimeLimit
 */
class SearchTimeLimit {
  static int timeout = 1000; // 1 second == 1000 ms

  public static void printSearchEnumeration(NamingEnumeration srhEnum) {
    int count = 0;
    try {
      while (srhEnum.hasMore()) {
        SearchResult sr = (SearchResult) srhEnum.next();
        System.out.println(">>>" + sr.getName());
        ++count;
      }
      System.out.println("number of answers: " + count);
    } catch (TimeLimitExceededException e) {
      System.out.println("search took more than " + timeout + "ms");
    } catch (NamingException e) {
      e.printStackTrace();
    }
  }

  public static void main(String[] args) {

    // Set up the environment for creating the initial context
    Hashtable<String, Object> env = new Hashtable<String, Object>(11);
    env
        .put(Context.INITIAL_CONTEXT_FACTORY,
            "com.sun.jndi.ldap.LdapCtxFactory");
    env.put(Context.PROVIDER_URL, "ldap://localhost:389/o=JNDITutorial");

    try {
      // Create initial context
      DirContext ctx = new InitialDirContext(env);

      // Set search controls to limit count to 'timeout'
      SearchControls ctls = new SearchControls();
      ctls.setSearchScope(SearchControls.SUBTREE_SCOPE);
      ctls.setTimeLimit(timeout); //

      // Search for objects with those matching attributes
      NamingEnumeration answer = ctx.search("", "(objectclass=*)", ctls);

      // Print the answer
      printSearchEnumeration(answer);

      // Close the context when we're done
      ctx.close();
    } catch (TimeLimitExceededException e) {
      System.out.println("time limit exceeded");
    } catch (Exception e) {
      System.err.println(e);
    }
  }
}

 

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