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package tools; |
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import java.io.IOException; |
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import java.io.OutputStream; |
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import java.io.PrintWriter; |
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import java.net.MalformedURLException; |
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import java.util.Vector; |
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import org.apache.xmlrpc.*; |
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/** |
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* Package: tools |
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* Class: PymolServerOutput |
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* Author: Henning Stehr, stehr@molgen.mpg.de |
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* Date: 2/Feb/2006 |
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* |
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* This class provides an output stream to send commands to a |
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* pymol server. It wraps the XML-RPC connection to the server |
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* using the url taken by the constructor. For convenience the |
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* OutputStream should be wrapped into a PrintStream. |
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* |
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* Code example: |
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* url = "http://localhost:9123"; |
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* PrintWriter serverOut = new PrintWriter(new PymolServerOutputStream(url), true); |
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* serverOut.println("load /project/StruPPi/PDBs/mainPDB/1RX4.pdb, hello"); |
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* |
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* Notes: |
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* - When constructing the PrintWriter, make sure to turn on automatic flushing |
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* by giving "true" as the second parameter, otherwise flush() has to be invoked |
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* manually to send the command to the server. |
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* - Automatic flushing is only invoked when using 'println' rather than 'print'. |
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* - For some reason, this does not work with a PrintStream only with a PrintWriter. |
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* - '\n' in command strings causes problems |
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* |
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* Changelog: |
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* 06/02/02 first created by HS |
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*/ |
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public class PymolServerOutputStream extends OutputStream { |
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static final String DEFAULTXMLRPCCOMMAND = "do"; |
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static final int INITIALBUFFERCAPACITY = 255; |
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static final int BUFFERCAPACITYINCREASE = 255; |
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static final int PYMOLCOMMANDLENGTHLIMIT = 1060; |
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byte[] commandBuffer; |
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int commandBufferPtr, // current load |
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commandBufferCap; // capacity |
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XmlRpcClient client; |
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/** |
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* Create a new output stream to the server running at the given url |
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*/ |
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public PymolServerOutputStream(String url) { |
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// create empty command buffer |
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commandBuffer = new byte[INITIALBUFFERCAPACITY]; |
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commandBufferCap = INITIALBUFFERCAPACITY; |
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commandBufferPtr = 0; |
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try { |
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// initialize connection to server |
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this.client = new XmlRpcClient(url); |
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} catch(MalformedURLException e) { |
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System.err.println("Error: Malformed URL in constructor of PymolServerOutputStream"); |
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e.printStackTrace(); |
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} |
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} |
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/** |
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* Store bytes in command buffer |
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*/ |
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@Override |
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public void write(int arg0) throws IOException { |
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if(commandBufferPtr >= commandBufferCap) { |
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// get more space |
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byte[] newBuffer = new byte[commandBufferCap + BUFFERCAPACITYINCREASE]; |
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for(int i = 0; i < commandBufferPtr; i++) { |
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newBuffer[i] = commandBuffer[i]; |
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} |
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commandBuffer = newBuffer; |
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commandBufferCap += BUFFERCAPACITYINCREASE; |
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} |
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commandBuffer[commandBufferPtr++] = (byte) arg0; |
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} |
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/** |
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* Send command to server whenever flush is invoked |
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*/ |
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@Override |
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public void flush() throws IOException { |
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// prevent overlong commands from being sent to server |
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if(commandBufferPtr > PYMOLCOMMANDLENGTHLIMIT + 1) { |
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throw new IOException(); |
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} |
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// prepare parameter vector |
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Vector<String> myvector = new Vector<String>(); |
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String commandString = new String(this.commandBuffer, 0, commandBufferPtr).trim(); |
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myvector.add(commandString); |
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// reset command buffer |
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this.commandBuffer = new byte[INITIALBUFFERCAPACITY]; |
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this.commandBufferCap = INITIALBUFFERCAPACITY; |
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this.commandBufferPtr = 0; |
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// submit command |
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try { |
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this.client.execute(DEFAULTXMLRPCCOMMAND, myvector); |
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} catch(XmlRpcException e) { |
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System.out.println("XMP-RPC exception occured."); |
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// send IOException instead, so use of XML-RPC is transparent |
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throw new IOException(); |
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} |
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} |
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// test function for current class |
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public static void main(String[] args) { |
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String serverUrl = "http://gelb:9123"; |
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String command0 = "delete hello"; |
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String command1 = "load /project/StruPPi/PDBs/mainPDB/1RX4.pdb, hello"; |
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String command2 = "show cartoon"; |
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String command3 = "select hello2, resi 12"; |
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String command4 = "show sticks, hello2"; |
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String command5 = "zoom hello2"; |
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// try to connect directly |
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System.out.println("Trying to connect directly by XML-RPC..."); |
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try { |
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XmlRpcClient client = new XmlRpcClient(serverUrl); |
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Vector<String> myvector = new Vector<String>(); |
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myvector.add(command1); |
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try { |
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client.execute(DEFAULTXMLRPCCOMMAND,myvector); |
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System.out.println("done."); |
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} |
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catch (IOException e) { |
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e.printStackTrace(); |
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} |
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catch( XmlRpcException e) { |
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e.printStackTrace(); |
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} |
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} |
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catch(MalformedURLException e){ |
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e.printStackTrace(); |
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} |
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// try using OutputStream |
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System.out.println("Trying to connect via PymolServerOutputStream..."); |
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try { |
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// create new output stream |
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OutputStream serverOut = new PymolServerOutputStream(serverUrl); |
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// send data to output stream |
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serverOut.write(command0.getBytes()); |
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// execute command |
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serverOut.flush(); |
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System.out.println("done."); |
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} catch(MalformedURLException e) { |
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System.out.println("Error: The server URL is wrong."); |
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e.printStackTrace(); |
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System.exit(1); |
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} catch(IOException e) { |
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System.out.println("Error writing to server url."); |
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e.printStackTrace(); |
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System.exit(1); |
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} |
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// now try using OutputStream wrapped into PrintStream |
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System.out.println("Trying to connect via PrintWriter..."); |
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PrintWriter serverOutPw = new PrintWriter(new PymolServerOutputStream(serverUrl), true); |
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serverOutPw.println(command0); |
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serverOutPw.println(command1); |
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serverOutPw.println(command2); |
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serverOutPw.println(command3); |
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serverOutPw.println(command4); |
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serverOutPw.println(command5); |
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System.out.println("done."); |
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} |
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} |