org.codehaus.groovy.runtime.SocketGroovyMethods Maven / Gradle / Ivy
/*
* Copyright 2003-2013 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.codehaus.groovy.runtime;
import groovy.lang.Closure;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Writer;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.logging.Logger;
/**
* This class defines new groovy methods for Sockets which enhance
* JDK classes inside the Groovy environment.
*
* NOTE: While this class contains many 'public' static methods, it is
* primarily regarded as an internal class (its internal package name
* suggests this also). We value backwards compatibility of these
* methods when used within Groovy but value less backwards compatibility
* at the Java method call level. I.e. future versions of Groovy may
* remove or move a method call in this file but would normally
* aim to keep the method available from within Groovy.
*/
public class SocketGroovyMethods extends DefaultGroovyMethodsSupport {
private static final Logger LOG = Logger.getLogger(SocketGroovyMethods.class.getName());
/**
* Passes the Socket's InputStream and OutputStream to the closure. The
* streams will be closed after the closure returns, even if an exception
* is thrown.
*
* @param socket a Socket
* @param closure a Closure
* @return the value returned by the closure
* @throws IOException if an IOException occurs.
* @since 1.5.2
*/
public static T withStreams(Socket socket, Closure closure) throws IOException {
InputStream input = socket.getInputStream();
OutputStream output = socket.getOutputStream();
try {
T result = closure.call(new Object[]{input, output});
InputStream temp1 = input;
input = null;
temp1.close();
OutputStream temp2 = output;
output = null;
temp2.close();
return result;
} finally {
closeWithWarning(input);
closeWithWarning(output);
}
}
/**
* Creates an InputObjectStream and an OutputObjectStream from a Socket, and
* passes them to the closure. The streams will be closed after the closure
* returns, even if an exception is thrown.
*
* @param socket this Socket
* @param closure a Closure
* @return the value returned by the closure
* @throws IOException if an IOException occurs.
* @since 1.5.0
*/
public static T withObjectStreams(Socket socket, Closure closure) throws IOException {
InputStream input = socket.getInputStream();
OutputStream output = socket.getOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(output);
ObjectInputStream ois = new ObjectInputStream(input);
try {
T result = closure.call(new Object[]{ois, oos});
InputStream temp1 = ois;
ois = null;
temp1.close();
temp1 = input;
input = null;
temp1.close();
OutputStream temp2 = oos;
oos = null;
temp2.close();
temp2 = output;
output = null;
temp2.close();
return result;
} finally {
closeWithWarning(ois);
closeWithWarning(input);
closeWithWarning(oos);
closeWithWarning(output);
}
}
/**
* Overloads the left shift operator to provide an append mechanism to
* add things to the output stream of a socket
*
* @param self a Socket
* @param value a value to append
* @return a Writer
* @throws IOException if an IOException occurs.
* @since 1.0
*/
public static Writer leftShift(Socket self, Object value) throws IOException {
return IOGroovyMethods.leftShift(self.getOutputStream(), value);
}
/**
* Overloads the left shift operator to provide an append mechanism
* to add bytes to the output stream of a socket
*
* @param self a Socket
* @param value a value to append
* @return an OutputStream
* @throws IOException if an IOException occurs.
* @since 1.0
*/
public static OutputStream leftShift(Socket self, byte[] value) throws IOException {
return IOGroovyMethods.leftShift(self.getOutputStream(), value);
}
/**
* Accepts a connection and passes the resulting Socket to the closure
* which runs in a new Thread.
*
* @param serverSocket a ServerSocket
* @param closure a Closure
* @return a Socket
* @throws IOException if an IOException occurs.
* @see java.net.ServerSocket#accept()
* @since 1.0
*/
public static Socket accept(ServerSocket serverSocket, final Closure closure) throws IOException {
return accept(serverSocket, true, closure);
}
/**
* Accepts a connection and passes the resulting Socket to the closure
* which runs in a new Thread or the calling thread, as needed.
*
* @param serverSocket a ServerSocket
* @param runInANewThread This flag should be true, if the closure should be invoked in a new thread, else false.
* @param closure a Closure
* @return a Socket
* @throws IOException if an IOException occurs.
* @see java.net.ServerSocket#accept()
* @since 1.7.6
*/
public static Socket accept(ServerSocket serverSocket, final boolean runInANewThread,
final Closure closure) throws IOException {
final Socket socket = serverSocket.accept();
if (runInANewThread) {
new Thread(new Runnable() {
public void run() {
invokeClosureWithSocket(socket, closure);
}
}).start();
} else {
invokeClosureWithSocket(socket, closure);
}
return socket;
}
private static void invokeClosureWithSocket(Socket socket, Closure closure) {
try {
closure.call(socket);
} finally {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
LOG.warning("Caught exception closing socket: " + e);
}
}
}
}
}