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public LDAPConnectionPool( String host, int port ) throws LDAPException { // poolsize=10,max=20,host,port, // noauth,nopswd this( 10, 20, host, port, "", "" ); } /** * Destroy the whole pool - called during a shutdown */ public void destroy() { for ( int i = 0; i < poolsize(); i++ ) { disconnect( (LDAPConnectionObject)poolelementAt(i) ); } poolremoveAllElements(); }
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The getConnection method retrieves an available LDAPConnection from the pool:
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/** * Get a connection from the pool * * If no connections are available, the pool will be * extended if the number of connections is less than * the maximum; if the pool cannot be extended, the method * blocks until a free connection becomes available * * @return an active connection */ public LDAPConnection getConnection() { LDAPConnection con; while( (con = getConnFromPool()) == null ) { synchronized( pool ) { try { poolwait(); } catch ( InterruptedException e ) { } } } return con; }
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/** * Get a connection from the pool * * If no connections are available, the pool will be * extended if the number of connections is less than * the maximum; if the pool cannot be extended, the method * returns null * * @return an active connection or null */ protected synchronized LDAPConnection getConnFromPool() { LDAPConnection con = null; LDAPConnectionObject ldapconnobj = null; int pSize = poolsize(); // Get an available connection for ( int i = 0; i < pSize; i++ ) { // Get the ConnectionObject from the pool LDAPConnectionObject conn = (LDAPConnectionObject)poolelementAt(i); if ( connisAvailable() ) { ldapconnobj = conn; break; } } if ( ldapconnobj == null ) { // If there were no conns in pool, can we grow // the pool if ( (poolMax < 0) || ( (poolMax > 0) && (pSize < poolMax)) ) { // Yes we can grow it int i = addConnection(); // If a new connection was created, use it if ( i >= 0 ) { ldapconnobj = (LDAPConnectionObject)poolelementAt(i); }
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} else { debug("All pool connections in use",true); } } if ( ldapconnobj != null ) { ldapconnobjsetInUse( true ); con = ldapconnobjgetLDAPConn(); } return con; }
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The close method, which follows, is what users of the pool invoke to close down (or return to the pool) a connection We do not actually shut down the connection, but we mark it as available for reuse Once we return a connection to the pool, a noti cation is sent to any thread waiting for a new connection
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/** * This is our soft close; all we do is mark * the connection available for others to use * * @param ld a connection to be returned to the pool */ public synchronized void close( LDAPConnection ld ) { int index = find( ld ); if ( index != -1 ) { LDAPConnectionObject co = (LDAPConnectionObject)poolelementAt(index); cosetInUse( false ); // Mark as available synchronized( pool ) { poolnotifyAll(); } } } /** * Debug method to print the contents of the pool */ public void printPool(){ Systemoutprintln(" LDAPConnectionPool "); for ( int i = 0; i < poolsize(); i++ ) { LDAPConnectionObject co = (LDAPConnectionObject)poolelementAt(i);
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Systemoutprintln( "" + i + "=" + co ); } } /** * Physically disconnect a connection object and set its * reference to null * * @param ld a connection to be discarded */ private void disconnect( LDAPConnectionObject ldapconnObject ) { if ( ldapconnObject != null ) { if (ldapconnObjectisAvailable()) { LDAPConnection ld = ldapconnObjectgetLDAPConn(); if ( (ld != null) && (ldisConnected()) ) { try { lddisconnect(); } catch (LDAPException e) { debug("disconnect: "+etoString()); } } ldapconnObjectsetLDAPConn(null); // Clear conn } } }
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The createPool method is called by the constructors and starts the pool setup It validates the arguments and resets any that are not acceptable The method then calls setUpPool to build the connections:
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private void createPool() throws LDAPException { // Called by the constructors if ( poolSize <= 0 ) { throw new LDAPException("LDAPConnectionPoolSize invalid"); } if ( poolMax < poolSize ) { debug("ConnectionPoolMax is invalid, set to " + poolSize); poolMax = poolSize; } debug("****Initializing LDAP Pool****",true); debug("LDAP host = "+host+" on port "+port,true); debug("Number of connections="+poolSize,true);
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