Java content handler for Android.

examples/android/App.java

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.examples.android;
+
+import android.content.Context;
+import android.util.Log;
+
+import org.chromium.mojo.bindings.Interface;
+import org.chromium.mojo.bindings.Interface.Proxy;
+import org.chromium.mojo.bindings.InterfaceRequest;
+import org.chromium.mojo.system.Core;
+import org.chromium.mojo.system.MessagePipeHandle;
+import org.chromium.mojo.system.MojoException;
+import org.chromium.mojo.system.RunLoop;
+import org.chromium.mojom.mojo.Application;
+import org.chromium.mojom.mojo.ExampleService;
+import org.chromium.mojom.mojo.ServiceProvider;
+import org.chromium.mojom.mojo.Shell;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * App holds all the code for this example application.
+ */
+class App {
+    private static String sTAG = "AndroidTestApp";

[qsr, 2015/02/05 16:50:07]

We usually name this just TAG.

[etiennej, 2015/02/06 16:22:29]

Done. We should remove the presubmit error that requires sTAG, then.

+
+    public static class ApplicationImpl implements Application {
+        private Shell mShell;
+        private List<ServiceProvider> mProviders = new ArrayList<ServiceProvider>();
+
+        public ApplicationImpl(MessagePipeHandle applicationRequest) {
+            ApplicationImpl.MANAGER.bind(this, applicationRequest);
+        }
+
+        @Override
+        public void initialize(Shell shell, String[] args) {
+            mShell = shell;
+        }
+
+        @Override
+        public void acceptConnection(String requestorUrl,
+                InterfaceRequest<ServiceProvider> services, ServiceProvider exposedServices) {
+            ServiceProviderImpl serviceProvider = new ServiceProviderImpl(services);
+            serviceProvider.addService(ExampleServiceImpl.class);
+            ServiceProvider.MANAGER.bind(serviceProvider, services);
+            mProviders.add(serviceProvider);

[qsr, 2015/02/05 16:50:07]

If you are not using exposedServices, you should close it yourself.

[etiennej, 2015/02/06 16:22:29]

Done.

+        };
+
+        @Override
+        public void requestQuit() {}

[qsr, 2015/02/05 16:50:07]

This should stop the runloop.

[etiennej, 2015/02/06 16:22:29]

Done.

+
+        @Override
+        public void close() {}

[qsr, 2015/02/05 16:50:07]

This should probably close mShell.

[etiennej, 2015/02/06 16:22:29]

Done.

+
+        @Override
+        public void onConnectionError(MojoException e) {}
+    }
+
+    public static class ServiceProviderImpl implements ServiceProvider {
+        /**
+         * ServiceFactoryBinder holds the necessary information to bind a service interface to a
+         * message pipe.
+         */
+        private static class ServiceFactoryBinder {
+            private final Class<Interface> mServiceClass;
+            private final Manager<Interface, ? extends Proxy> mManager;
+
+            public ServiceFactoryBinder(Class<Interface> serviceClass) {
+                mServiceClass = serviceClass;
+                Field managerField;
+                try {
+                    managerField = serviceClass.getField("MANAGER");
+                } catch (NoSuchFieldException e) {
+                    throw new RuntimeException(e);
+                }
+                try {
+                    // localManager is used to limit the scope of
+                    // @SuppressWarnings.
+                    @SuppressWarnings("unchecked")
+                    Manager<Interface, ? extends Proxy> localManager =
+                            (Manager<Interface, ? extends Proxy>) managerField.get(null);
+                    this.mManager = localManager;
+                } catch (IllegalAccessException e) {
+                    throw new RuntimeException(e);
+                }
+            }
+
+            public void bindNewInstanceToMessagePipe(MessagePipeHandle pipe) {
+                try {
+                    mManager.bind(mServiceClass.getConstructor().newInstance(), pipe);

[qsr, 2015/02/05 16:50:07]

Can you not to use reflection? You can define an  ServiceFactoryBinder as an
interface and pass an instance of this to the addService method.

[etiennej, 2015/02/06 16:22:29]

Done.

+                } catch (NoSuchMethodException e) {
+                    throw new RuntimeException(e);
+                } catch (InstantiationException e) {
+                    throw new RuntimeException(e);
+                } catch (IllegalAccessException e) {
+                    throw new RuntimeException(e);
+                } catch (InvocationTargetException e) {
+                    throw new RuntimeException(e);
+                }
+            }
+
+            public String getInterfaceName() {
+                return mManager.getName();
+            }
+        }
+
+        private InterfaceRequest<ServiceProvider> mProvider;

[qsr, 2015/02/05 16:50:07]

You do not need to keep this object alive.

[etiennej, 2015/02/06 16:22:29]

Done.

+        private Map<String, ServiceFactoryBinder> mNameToServiceMap =
+                new HashMap<String, ServiceFactoryBinder>();
+
+        public ServiceProviderImpl(InterfaceRequest<ServiceProvider> provider) {
+            mProvider = provider;
+        }
+
+        /**
+         * AddService adds a new service to the list of services provided by this application.
+         */
+        public void addService(Class serviceImpl) {
+            @SuppressWarnings("unchecked")
+            ServiceFactoryBinder binder = new ServiceFactoryBinder(serviceImpl);
+            mNameToServiceMap.put(binder.getInterfaceName(), binder);
+        }
+
+        @Override
+        public void connectToService(String interfaceName, MessagePipeHandle pipe) {
+            if (mNameToServiceMap.containsKey(interfaceName)) {
+                mNameToServiceMap.get(interfaceName).bindNewInstanceToMessagePipe(pipe);
+            }

[qsr, 2015/02/05 16:50:07]

You and to close the pipe if you do not bind it.

[etiennej, 2015/02/06 16:22:29]

Done.

+        }
+
+        @Override
+        public void close() {}
+
+        @Override
+        public void onConnectionError(MojoException e) {}
+    }
+
+    public static class ExampleServiceImpl implements ExampleService {
+        public ExampleServiceImpl() {}
+
+        @Override
+        public void ping(short pingValue, ExampleService.PingResponse callback) {
+            callback.call(pingValue);
+        }
+
+        @Override
+        public void close() {}
+
+        @Override
+        public void onConnectionError(MojoException e) {}
+    }
+
+    public static void mojoMain(Context context, Core core, int applicationRequestHandle) {
+        Log.i(sTAG, "App.MojoMain called");
+        RunLoop runLoop = core.createDefaultRunLoop();
+        Log.i(sTAG, "Run loop created");
+
+        MessagePipeHandle handle =
+                core.acquireNativeHandle(applicationRequestHandle).toMessagePipeHandle();
+        Application application = new ApplicationImpl(handle);
+
+        Log.i(sTAG, "Setup done, starting run loop");
+        runLoop.run();
+        Log.i(sTAG, "Run loop exited");
+    }
+}