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/*
* Copyright 2009 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.gwt.rpc.server;
import com.google.gwt.rpc.client.ast.ArrayValueCommand;
import com.google.gwt.rpc.client.ast.CommandSink;
import com.google.gwt.rpc.client.ast.EnumValueCommand;
import com.google.gwt.rpc.client.ast.HasSetters;
import com.google.gwt.rpc.client.ast.IdentityValueCommand;
import com.google.gwt.rpc.client.ast.InstantiateCommand;
import com.google.gwt.rpc.client.ast.InvokeCustomFieldSerializerCommand;
import com.google.gwt.rpc.client.ast.NullValueCommand;
import com.google.gwt.rpc.client.ast.ValueCommand;
import com.google.gwt.rpc.client.impl.CommandSerializationStreamWriterBase;
import com.google.gwt.rpc.client.impl.HasValuesCommandSink;
import com.google.gwt.rpc.server.CommandSerializationUtil.Accessor;
import com.google.gwt.user.client.rpc.IsSerializable;
import com.google.gwt.user.client.rpc.SerializationException;
import com.google.gwt.user.server.rpc.impl.SerializabilityUtil;
import java.io.Serializable;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.IdentityHashMap;
import java.util.Map;
/**
* A server-side implementation of SerializationStreamWriter that creates a
* command stream.
*/
public class CommandServerSerializationStreamWriter extends
CommandSerializationStreamWriterBase {
private final ClientOracle clientOracle;
private final Map identityMap;
public CommandServerSerializationStreamWriter(CommandSink sink) {
this(new HostedModeClientOracle(), sink);
}
public CommandServerSerializationStreamWriter(ClientOracle oracle,
CommandSink sink) {
this(oracle, sink, new IdentityHashMap());
}
private CommandServerSerializationStreamWriter(ClientOracle oracle,
CommandSink sink, Map identityMap) {
super(sink);
this.clientOracle = oracle;
this.identityMap = identityMap;
}
/**
* Type is passed in to handle primitive types.
*/
@Override
protected ValueCommand makeValue(Class type, Object value)
throws SerializationException {
if (value == null) {
return NullValueCommand.INSTANCE;
}
/*
* Check accessor map before the identity map because we don't want to
* recurse on wrapped primitive values.
*/
Accessor accessor;
if ((accessor = CommandSerializationUtil.getAccessor(type)).canMakeValueCommand()) {
return accessor.makeValueCommand(value);
} else if (identityMap.containsKey(value)) {
return identityMap.get(value);
} else if (type.isArray()) {
return makeArray(type, value);
} else if (Enum.class.isAssignableFrom(type)) {
return makeEnum(value);
} else {
return makeObject(type, value);
}
}
private ArrayValueCommand makeArray(Class type, Object value)
throws SerializationException {
ArrayValueCommand toReturn = new ArrayValueCommand(type.getComponentType());
identityMap.put(value, toReturn);
for (int i = 0, j = Array.getLength(value); i < j; i++) {
Object arrayValue = Array.get(value, i);
if (arrayValue == null) {
toReturn.add(NullValueCommand.INSTANCE);
} else {
Class valueType = type.getComponentType().isPrimitive()
? type.getComponentType() : arrayValue.getClass();
toReturn.add(makeValue(valueType, arrayValue));
}
}
return toReturn;
}
private ValueCommand makeEnum(Object value) {
EnumValueCommand toReturn = new EnumValueCommand();
toReturn.setValue((Enum) value);
return toReturn;
}
/*
* TODO: Profiling shows that the reflection and conditional logic in this
* method is a hotspot. This could be remedied by generating synthetic
* InstantiateCommand types that initialize themselves.
*/
private IdentityValueCommand makeObject(Class type, Object value)
throws SerializationException {
if (type.isAnonymousClass() || type.isLocalClass()) {
throw new SerializationException(
"Cannot serialize anonymous or local classes");
}
Class manualType = type;
Class customSerializer;
do {
customSerializer = SerializabilityUtil.hasCustomFieldSerializer(manualType);
if (customSerializer != null) {
break;
}
manualType = manualType.getSuperclass();
} while (manualType != null);
IdentityValueCommand ins;
if (customSerializer != null) {
ins = serializeWithCustomSerializer(customSerializer, value, type,
manualType);
} else {
ins = new InstantiateCommand(type);
identityMap.put(value, ins);
}
/*
* If we're looking at a subclass of a manually-serialized type, the
* subclass must be tagged as serializable in order to qualify for
* serialization.
*/
if (type != manualType) {
if (!Serializable.class.isAssignableFrom(type)
&& !IsSerializable.class.isAssignableFrom(type)) {
throw new SerializationException(type.getName()
+ " is not a serializable type");
}
}
while (type != manualType) {
Field[] serializableFields = clientOracle.getOperableFields(type);
for (Field declField : serializableFields) {
assert (declField != null);
Accessor accessor = CommandSerializationUtil.getAccessor(declField.getType());
ValueCommand valueCommand;
Object fieldValue = accessor.get(value, declField);
if (fieldValue == null) {
valueCommand = NullValueCommand.INSTANCE;
} else {
Class fieldType = declField.getType().isPrimitive()
? declField.getType() : fieldValue.getClass();
valueCommand = makeValue(fieldType, fieldValue);
}
((HasSetters) ins).set(declField.getDeclaringClass(),
declField.getName(), valueCommand);
}
type = type.getSuperclass();
}
return ins;
}
private InvokeCustomFieldSerializerCommand serializeWithCustomSerializer(
Class customSerializer, Object instance, Class instanceClass,
Class manuallySerializedType) throws SerializationException {
assert !instanceClass.isArray();
Exception ex;
try {
/*
* NB: Class.getMethod() wants exact formal types. It may be the case that
* the custom serializer uses looser type bounds in its method
* declarations.
*/
for (Method method : customSerializer.getMethods()) {
if ("serialize".equals(method.getName())) {
assert Modifier.isStatic(method.getModifiers()) : "serialize method "
+ "in type " + customSerializer.getName() + " must be static";
final InvokeCustomFieldSerializerCommand toReturn = new InvokeCustomFieldSerializerCommand(
instanceClass, customSerializer, manuallySerializedType);
identityMap.put(instance, toReturn);
/*
* Pass the current identityMap into the new writer to allow circular
* references through the graph emitted by the CFS.
*/
CommandServerSerializationStreamWriter subWriter = new CommandServerSerializationStreamWriter(
clientOracle, new HasValuesCommandSink(toReturn), identityMap);
method.invoke(null, subWriter, instance);
return toReturn;
}
}
throw new NoSuchMethodException(
"Could not find serialize method in custom serializer "
+ customSerializer.getName());
} catch (SecurityException e) {
ex = e;
} catch (NoSuchMethodException e) {
ex = e;
} catch (IllegalArgumentException e) {
ex = e;
} catch (IllegalAccessException e) {
ex = e;
} catch (InvocationTargetException e) {
ex = e;
}
throw new SerializationException(ex);
}
}
