svn commit: r573110 - in /mina/trunk/example/src/main/java/org/apache/mina/example/httpclient: ./ Wget.java

[mw...@apache.org]

Author: mwebb
Date: Wed Sep  5 16:46:29 2007
New Revision: 573110

URL: http://svn.apache.org/viewvc?rev=573110&view=rev
Log:
initial creation.  All this does is grab a url and print the page to the screen, just like a simple call to the unix command wget.

Added:
    mina/trunk/example/src/main/java/org/apache/mina/example/httpclient/
    mina/trunk/example/src/main/java/org/apache/mina/example/httpclient/Wget.java

Added: mina/trunk/example/src/main/java/org/apache/mina/example/httpclient/Wget.java
URL: http://svn.apache.org/viewvc/mina/trunk/example/src/main/java/org/apache/mina/example/httpclient/Wget.java?rev=573110&view=auto
==============================================================================
--- mina/trunk/example/src/main/java/org/apache/mina/example/httpclient/Wget.java (added)
+++ mina/trunk/example/src/main/java/org/apache/mina/example/httpclient/Wget.java Wed Sep  5 16:46:29 2007
@@ -0,0 +1,228 @@
+/*
+ *   Licensed to the Apache Software Foundation (ASF) under one
+ *   or more contributor license agreements.  See the NOTICE file
+ *   distributed with this work for additional information
+ *   regarding copyright ownership.  The ASF licenses this file
+ *   to you 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.apache.mina.example.httpclient;
+
+
+import java.net.URL;
+
+import org.apache.mina.http.client.AsyncHttpClient;
+import org.apache.mina.http.client.AsyncHttpClientCallback;
+import org.apache.mina.http.codec.HttpRequestMessage;
+import org.apache.mina.http.codec.HttpResponseMessage;
+
+
+/**
+ * Very minimal example of how to write an HTTP Client.
+ *
+ * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
+ * @version $Rev$, $Date$
+ */
+public class Wget
+{
+    /**
+     * object that is used to trigger events that have happened.  Rudimentary 
+     * locking mechanism for this class.  
+     */
+    protected static final Object semaphore = new Object();
+
+
+    /**
+     * Creates a new instance of HttpClient.  Constructor that does all
+     * the work for this example.  
+     *
+     * @param url
+     *  Example: http://www.google.com
+     * @throws Exception
+     *  thrown if something goes wrong.
+     */
+    public Wget( URL url ) throws Exception
+    {
+        WgetCallback callback = new WgetCallback();
+
+        String path = null;
+        if ( url.getPath() == null || url.getPath().length() == 0 )
+            path = "/index.html";
+        else
+            path = url.getPath();
+
+        HttpRequestMessage request = new HttpRequestMessage( path );
+        AsyncHttpClient ahc = new AsyncHttpClient( url, callback );
+        ahc.connect();
+        ahc.sendRequest( request );
+        synchronized ( semaphore )
+        {
+            //5 second timeout due to no response
+            semaphore.wait( 5000 );
+        }
+
+        if ( callback.isException() )
+            throw new Exception( callback.getThrowable() );
+
+        HttpResponseMessage msg = callback.getMessage();
+        System.out.println( msg.getStringContent() );
+    }
+
+    class WgetCallback implements AsyncHttpClientCallback
+    {
+
+        private boolean closed = false;
+        private boolean exception = false;
+        private Throwable throwable = null;
+        private HttpResponseMessage message = null;
+
+
+        public WgetCallback()
+        {
+            clear();
+        }
+
+
+        /**
+         * What to do when a response has come from the server
+         * 
+         * @see org.apache.mina.http.client.AsyncHttpClientCallback#onResponse(org.apache.mina.http.codec.HttpResponseMessage)
+         */
+        public void onResponse( HttpResponseMessage message )
+        {
+            this.message = message;
+            synchronized ( semaphore )
+            {
+                semaphore.notify();
+            }
+        }
+
+
+        /**
+         * What to do when an exception has been thrown
+         * 
+         * @see org.apache.mina.http.client.AsyncHttpClientCallback#onException(java.lang.Throwable)
+         */
+        public void onException( Throwable cause )
+        {
+            throwable = cause;
+            exception = true;
+            synchronized ( semaphore )
+            {
+                semaphore.notify();
+            }
+        }
+
+
+        /**
+         * The connection has been closed, notify the semaphore object and set
+         * closed to true.
+         * 
+         * @see org.apache.mina.http.client.AsyncHttpClientCallback#onClosed()
+         */
+        public void onClosed()
+        {
+            closed = true;
+            synchronized ( semaphore )
+            {
+                semaphore.notify();
+            }
+        }
+
+
+        /**
+         * return the Throwable that this class has thrown
+         *
+         * @return
+         *  the Throwable that this class has thrown
+         */
+        public Throwable getThrowable()
+        {
+            return throwable;
+        }
+
+
+        /**
+         * Reset all private fields in this class
+         *
+         */
+        public void clear()
+        {
+            closed = false;
+            exception = false;
+            message = null;
+        }
+
+
+        /**
+         * TODO isClosed.
+         *
+         * @return
+         */
+        public boolean isClosed()
+        {
+            return closed;
+        }
+
+
+        public void setClosed( boolean closed )
+        {
+            this.closed = closed;
+        }
+
+
+        public boolean isException()
+        {
+            return exception;
+        }
+
+
+        public void setException( boolean exception )
+        {
+            this.exception = exception;
+        }
+
+
+        public HttpResponseMessage getMessage()
+        {
+            return message;
+        }
+
+
+        public void setMessage( HttpResponseMessage message )
+        {
+            this.message = message;
+        }
+    }
+
+
+    /**
+     * Entry point for trying out the HttpClient example application.  This
+     * class will print out the page that is specified in the first parameter
+     * and write it to a file specified by the seconds parameter
+     *
+     * @param args
+     *  String array of length 1.  First parameter is the url
+     * @throws Exception 
+     *  Thrown if something goes wrong.
+     */
+    public static void main( String[] args ) throws Exception
+    {
+        URL theUrlRequest = new URL( args[0] );
+        new Wget( theUrlRequest );
+
+        System.exit( 0 );
+    }
+}