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/*
* Copyright (C) 2016 Google Inc.
*
* 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 com.google.android.mobly.snippet.manager;
import android.os.Build;
import com.google.android.mobly.snippet.Snippet;
import com.google.android.mobly.snippet.rpc.MethodDescriptor;
import com.google.android.mobly.snippet.rpc.RpcMinSdk;
import com.google.android.mobly.snippet.rpc.RunOnUiThread;
import com.google.android.mobly.snippet.util.Log;
import com.google.android.mobly.snippet.util.MainThread;
import com.google.android.mobly.snippet.util.SnippetLibException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.concurrent.Callable;
public class SnippetManager {
private final Map<Class<? extends Snippet>, Snippet> mSnippets;
/** A map of strings to known RPCs. */
private final Map<String, MethodDescriptor> mKnownRpcs;
public SnippetManager(Collection<Class<? extends Snippet>> classList) {
// Synchronized for multiple connections on the same session. Can't use ConcurrentHashMap
// because we have to put in a value of 'null' before the class is constructed, but
// ConcurrentHashMap does not allow null values.
mSnippets = Collections.synchronizedMap(new HashMap<Class<? extends Snippet>, Snippet>());
Map<String, MethodDescriptor> knownRpcs = new HashMap<>();
for (Class<? extends Snippet> receiverClass : classList) {
mSnippets.put(receiverClass, null);
Collection<MethodDescriptor> methodList = MethodDescriptor.collectFrom(receiverClass);
for (MethodDescriptor m : methodList) {
if (knownRpcs.containsKey(m.getName())) {
// We already know an RPC of the same name. We don't catch this anywhere because
// this is a programming error.
throw new RuntimeException(
"An RPC with the name " + m.getName() + " is already known.");
}
knownRpcs.put(m.getName(), m);
}
}
// Does not need to be concurrent because this map is read only, so it is safe to access
// from multiple threads. Wrap in an unmodifiableMap to enforce this.
mKnownRpcs = Collections.unmodifiableMap(knownRpcs);
}
public MethodDescriptor getMethodDescriptor(String methodName) {
return mKnownRpcs.get(methodName);
}
public SortedSet<String> getMethodNames() {
return new TreeSet<>(mKnownRpcs.keySet());
}
public Object invoke(Class<? extends Snippet> clazz, Method method, Object[] args)
throws Throwable {
if (method.isAnnotationPresent(RpcMinSdk.class)) {
int requiredSdkLevel = method.getAnnotation(RpcMinSdk.class).value();
if (Build.VERSION.SDK_INT < requiredSdkLevel) {
throw new SnippetLibException(
String.format(
"%s requires API level %d, current level is %d",
method.getName(), requiredSdkLevel, Build.VERSION.SDK_INT));
}
}
Snippet object;
try {
object = get(clazz);
return invoke(object, method, args);
} catch (InvocationTargetException e) {
throw e.getCause();
}
}
public void shutdown() throws Exception {
for (final Entry<Class<? extends Snippet>, Snippet> entry : mSnippets.entrySet()) {
if (entry.getValue() == null) {
continue;
}
Method method = entry.getKey().getMethod("shutdown");
if (method.isAnnotationPresent(RunOnUiThread.class)) {
Log.d("Shutting down " + entry.getKey().getName() + " on the main thread");
MainThread.run(new Callable<Void>() {
@Override
public Void call() throws Exception {
entry.getValue().shutdown();
return null;
}
});
} else {
Log.d("Shutting down " + entry.getKey().getName());
entry.getValue().shutdown();
}
}
}
private Snippet get(Class<? extends Snippet> clazz) throws Exception {
Snippet snippetImpl = mSnippets.get(clazz);
if (snippetImpl == null) {
// First time calling an RPC for this snippet; construct an instance under lock.
synchronized (clazz) {
snippetImpl = mSnippets.get(clazz);
if (snippetImpl == null) {
final Constructor<? extends Snippet> constructor = clazz.getConstructor();
if (constructor.isAnnotationPresent(RunOnUiThread.class)) {
Log.d("Constructing " + clazz + " on the main thread");
snippetImpl = MainThread.run(new Callable<Snippet>() {
@Override
public Snippet call() throws Exception {
return constructor.newInstance();
}
});
} else {
Log.d("Constructing " + clazz);
snippetImpl = constructor.newInstance();
}
mSnippets.put(clazz, snippetImpl);
}
}
}
return snippetImpl;
}
private Object invoke(final Snippet snippetImpl, final Method method, final Object[] args)
throws Exception {
if (method.isAnnotationPresent(RunOnUiThread.class)) {
Log.d("Invoking RPC method " + method.getDeclaringClass() + "#" + method.getName()
+ " on the main thread");
return MainThread.run(new Callable<Object>() {
@Override
public Object call() throws Exception {
return method.invoke(snippetImpl, args);
}
});
} else {
Log.d("Invoking RPC method " + method.getDeclaringClass() + "#" + method.getName());
return method.invoke(snippetImpl, args);
}
}
}
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