PDF Slides, 4.2MB - Wolf Paulus

Agenda

Server Side (e.g. Tomcat)

Hessian, Binary Protocol

Http-Session Support

Client

hessdroid

remote calls / async

Quick Tips

Use Android’s R.class

Auto-Launch an Intent at boot time

Client

Things that can will go wrong

Agenda

Switch Activity

Remote call

reload users

Remote Call to getNext

Four item main menu

Exposing a Service Class: Hessian Binary Web Service Protocol

Java Hessian

package com.carlsbadcubes.api;

import java.util.Collection;

public interface CommService { Collection<Message> getMessages();

Collection<User> getUsers();}

<?xml version="1.0" encoding="UTF-8"?><web-app>

<servlet> <servlet-name>myservice</servlet-name> <servlet-class>com.caucho.hessian.server.HessianServlet</servlet-class>

<init-param> <param-name>service-class</param-name> <param-value>com.carlsbadcubes.impl.CommServiceImpl</param-value> </init-param>

<init-param> <param-name>api-class</param-name> <param-value>com.carlsbadcubes.api.CommService</param-value> </init-param>

</servlet>

<servlet-mapping> <servlet-name>myservice</servlet-name> <url-pattern>/service/*</url-pattern> </servlet-mapping>

</web-app>

Interface

Implementation

defined in hessian.jar

Roles <security-role> <role-name>HessianService</role-name> </security-role> <login-config> <auth-method>BASIC</auth-method> <realm-name>default</realm-name> </login-config> <security-constraint> <web-resource-collection> <web-resource-name>SecureConnection</web-resource-name> <url-pattern>/service/*</url-pattern> <url-pattern>/comm/*</url-pattern>

... <http-method>GET</http-method> <http-method>POST</http-method> </web-resource-collection> <auth-constraint> <role-name>HessianService</role-name> </auth-constraint> <user-data-constraint> <transport-guarantee>NONE</transport-guarantee> </user-data-constraint> </security-constraint>

Groups or Principals

Communication

Components

Access Privileges

Servlet

Thread

http requests

ServiceClassimpl.

ServiceAPI

created in servlet.init()

http response

JSESSIONID = 123

JSESSIONID = 789

JSESSIONID = 357

SessionMap

789357

Servlet

Thread

ServiceClassimpl.

ServiceAPI

request.getSession()

http response

JSESSIONID = 123

JSESSIONID = 789

JSESSIONID = 357

SessionMap

789357

http request Servlet

Thread

ServiceClassimpl.

ServiceAPI

123ThreadLocal

789ThreadLocal

357ThreadLocal

The ThreadLocal Class:

public class ThreadLocal<T> { public void set( T newValue ); public T get(); public void remove(); protected T initialValue();}

HessianHttpServlet extends HessianServlet implements HessianHttpService {

... not in hessian.jar

.. all of HessianServlet

Discovery Service for Android Clients

Map<String, String> getServices()

puts HttpSession Map into ThreadLocal

memory

HessianHttpServlet extends HessianServlet implements HessianHttpService

HessianHttpServlet@Overrideinit() .. // // introspect service implementation to find out if we have to put the servlet into a session // if ( getInitParameter("service-class") != null ) { String className = getInitParameter("service-class"); if (className != null) { this.requiresSessionSupport = StateKeeper.class.isAssignableFrom(loadClass(className)); } if (this.requiresSessionSupport) { System.out.println(className + " has been registered for session support."); } }

@Overrideservice() ..

if (this.requiresSessionSupport) { HttpServletRequest req = (HttpServletRequest) request; ThreadLocalAttrMap.set( req.getSession( true ) ); }

= Client

String url = “http://hostname.domain:port/service”;

ServiceProxyFactory factory = new HessianProxyFactory();factory.set ..(..);factory.set ..(..).

CommService cs = factory.create( CommService.class, url , getClassLoader());

hessdroidhttp://code.google.com/p/hessdroid/

HessDroid Generified ...HessianProxyFactory:public <T>T create( Class<T> api,

String urlName, ClassLoader loader);

Clientside code without casting:Service s = (Service) factory.create( Service.class, url, cl );

Creates a Cookie Map,Maintains HttpSessions

HessianHttpProxyFactory extends HessianProxyFactory {

Service Discovery:maps Interfaces to URLs

HessianFactory.initialize( )

... not in hessdroid.jar

Hessian Client

CommService cs = HessianFactory.create( CommService.class, getClassLoader() )

DemoTomcat Server with a Hessian Service and a Hessian based Android Client

Async ....

Don’t run HessionFactory.create(..) in the main threadDon’t run remote method calls in the main thread either.

Interface Garage { void openDoor();

Car getCar();}

Interface Car {void openDoor();Color getColor();

Garage garage = HessianFactory.create( Garage.class, getClassLoader() );

// The interface Garage and the class CarImpl// need to be available on the client to make this work:

garage.openDoor(); // remote callgarage.getCar().openDoor(); // local call

Use Android’s R.XML:

int c0 = getResources().getColor( R.color.ink );int c1 = getResources().getColor( android.R.color.darker_gray );

Use Intent flags to control the flow.

XML: (Activity)<activity .. android:taskAffinity=” ”launchMode, allowTaskReparenting, clearTaskOnLaunch, alwaysRetainTaskState, finishOnTaskLaunch ..>

Code: (Intent)

myIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)

Auto-Launch after boot (1 of 2)

AndroidManifest:..<receiver android:name=".BootNotificationReceiver"> <intent-filter>

</intent-filter></receiver><service android:name=".HessianService"/></application>

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>

Auto-Launch after boot (2 of 2)

public class BootNotificationReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { if (Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())) {

context.startService(new Intent(context, HessianService.class));

Things that can will go wrongwrong classloader:java.lang.IllegalArgumentException: com.pss.api.Service is not visible from class loaderUse AppContext.getClassLoader()

app doesn’t have Internet permission:com.caucho.hessian.client.HessianRuntimeException: java.net.SocketException: Permission deniedAndroidManifest.xml <uses-permission android:name="android.permission.INTERNET"/>

app cannot be debugged:need to add the debuggable attribute to the application tag in the AndroidManifest <application android:icon="@drawable/msg" android:debuggable="true">

wrong server URL (localhost doesn’t work.)com.caucho.hessian.client.HessianRuntimeException: java.net.ConnectException: /192.168.200.120:80 - Connection refused

Unlocking Android

Android Wireless Application Development

Thanks For Coming!

http://twitter.com/wolfpaulus

Slides & SourcesSlides: http://wolfpaulus.com/bio/talks/androidws.pdf

Code: http://wolfpaulus.com/bio/talks/androidws.zip

Email: wolf@wolfpaulus.com

PDF Slides, 4.2MB - Wolf Paulus

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