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/*
* Copyright 2008 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.user.rebind.rpc;
import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.GwtScriptOnly;
import com.google.gwt.core.client.JsArrayString;
import com.google.gwt.core.ext.BadPropertyValueException;
import com.google.gwt.core.ext.CachedGeneratorResult;
import com.google.gwt.core.ext.ConfigurationProperty;
import com.google.gwt.core.ext.GeneratorContext;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JClassType;
import com.google.gwt.core.ext.typeinfo.JMethod;
import com.google.gwt.core.ext.typeinfo.JParameterizedType;
import com.google.gwt.core.ext.typeinfo.JType;
import com.google.gwt.core.ext.typeinfo.TypeOracle;
import com.google.gwt.dev.util.log.speedtracer.CompilerEventType;
import com.google.gwt.dev.util.log.speedtracer.SpeedTracerLogger;
import com.google.gwt.dev.util.log.speedtracer.SpeedTracerLogger.Event;
import com.google.gwt.user.client.rpc.SerializationStreamReader;
import com.google.gwt.user.client.rpc.SerializationStreamWriter;
import com.google.gwt.user.client.rpc.impl.SerializerBase;
import com.google.gwt.user.client.rpc.impl.TypeHandler;
import com.google.gwt.user.rebind.ClassSourceFileComposerFactory;
import com.google.gwt.user.rebind.SourceWriter;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.IdentityHashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* This class generates a class with name 'typeSerializerClassName' that is able
* to serialize and deserialize a set of types into or out of a stream. The set
* of types is obtained from the SerializableTypeOracle object.
*/
public class TypeSerializerCreator {
/**
* Configuration property to use type indices instead of type signatures.
*/
public static final String GWT_ELIDE_TYPE_NAMES_FROM_RPC = "gwt.elideTypeNamesFromRPC";
/**
* Default number of types to split createMethodMap entries into. Zero means
* no sharding occurs. Stored as a string since it is used as a default
* property value.
*
* Note that the inliner will likely reassemble the shards if it is used in
* Production Mode, but it isn't needed there anyway.
*
* TODO: remove this (and related code) when it is no longer needed.
*/
private static final String DEFAULT_CREATEMETHODMAP_SHARD_SIZE = "0";
/**
* Java system property name to override the above.
*/
private static final String GWT_CREATEMETHODMAP_SHARD_SIZE = "gwt.typecreator.shard.size";
private static int shardSize = -1;
/**
* The maximum number of bytes that should be used in the source code of a method body.
* The absolute maximum limit is 64k (or it will fail to compile) however 8k is the limit
* for the JIT compiler (HotSpot) and methods over this limit will run slower. We will leave a 1k
* buffer and set the limit at 7k.
*/
private static final int MAX_BYTES_PER_METHOD = 7168;
private static final String LOAD_METHODS_JAVA_HELPER_PREFIX = "populateLoadMethodsJavaMap";
private static final String LOAD_SIGNATURES_JAVA_HELPER_PREFIX = "populateLoadSignaturesJavaMap";
private static void computeShardSize(TreeLogger logger) throws UnableToCompleteException {
String shardSizeProperty =
System.getProperty(GWT_CREATEMETHODMAP_SHARD_SIZE, DEFAULT_CREATEMETHODMAP_SHARD_SIZE);
try {
shardSize = Integer.valueOf(shardSizeProperty);
if (shardSize < 0) {
logger.log(TreeLogger.ERROR, GWT_CREATEMETHODMAP_SHARD_SIZE + " must be non-negative: "
+ shardSizeProperty);
throw new UnableToCompleteException();
}
} catch (NumberFormatException e) {
logger.log(TreeLogger.ERROR, "Property " + GWT_CREATEMETHODMAP_SHARD_SIZE + " not a number: "
+ shardSizeProperty, e);
throw new UnableToCompleteException();
}
}
private final GeneratorContext context;
private final SerializableTypeOracle deserializationOracle;
private final boolean elideTypeNames;
private final JType[] serializableTypes;
private final SerializableTypeOracle serializationOracle;
private final SourceWriter srcWriter;
private final TypeOracle typeOracle;
private final String typeSerializerClassName;
private final String typeSerializerSimpleName;
private final Map typeStrings = new IdentityHashMap();
private final Set typesNotUsingCustomFieldSerializers;
private final Set customFieldSerializersUsed;
public TypeSerializerCreator(TreeLogger logger, SerializableTypeOracle serializationOracle,
SerializableTypeOracle deserializationOracle, GeneratorContext context,
String typeSerializerClassName, String typeSerializerSimpleName)
throws UnableToCompleteException {
this.context = context;
this.typeSerializerClassName = typeSerializerClassName;
this.typeSerializerSimpleName = typeSerializerSimpleName;
this.serializationOracle = serializationOracle;
this.deserializationOracle = deserializationOracle;
this.typeOracle = context.getTypeOracle();
Set typesSet = new HashSet();
typesSet.addAll(Arrays.asList(serializationOracle.getSerializableTypes()));
typesSet.addAll(Arrays.asList(deserializationOracle.getSerializableTypes()));
serializableTypes = typesSet.toArray(new JType[0]);
Arrays.sort(serializableTypes, SerializableTypeOracleBuilder.JTYPE_COMPARATOR);
srcWriter = getSourceWriter(logger, context);
if (shardSize < 0) {
computeShardSize(logger);
}
if (logger.isLoggable(TreeLogger.TRACE)) {
logger.log(TreeLogger.TRACE, "Using a shard size of " + shardSize
+ " for TypeSerializerCreator createMethodMap");
}
try {
ConfigurationProperty prop =
context.getPropertyOracle().getConfigurationProperty(GWT_ELIDE_TYPE_NAMES_FROM_RPC);
elideTypeNames = Boolean.parseBoolean(prop.getValues().get(0));
} catch (BadPropertyValueException e) {
logger.log(TreeLogger.ERROR, "The configuration property " + GWT_ELIDE_TYPE_NAMES_FROM_RPC
+ " was not defined. Is RemoteService.gwt.xml inherited?");
throw new UnableToCompleteException();
}
if (context.isGeneratorResultCachingEnabled()) {
typesNotUsingCustomFieldSerializers = new HashSet();
customFieldSerializersUsed = new HashSet();
} else {
typesNotUsingCustomFieldSerializers = null;
customFieldSerializersUsed = null;
}
}
public Set getCustomSerializersUsed() {
return customFieldSerializersUsed;
}
public Set getTypesNotUsingCustomSerializers() {
return typesNotUsingCustomFieldSerializers;
}
public Map getTypeStrings() {
return Collections.unmodifiableMap(typeStrings);
}
public String realize(TreeLogger logger) {
logger =
logger.branch(TreeLogger.DEBUG, "Generating TypeSerializer for service interface '"
+ typeSerializerClassName + "'", null);
createFieldSerializers(logger, context);
int index = 0;
for (JType type : getSerializableTypes()) {
String typeString;
if (elideTypeNames) {
typeString = Integer.toString(++index, Character.MAX_RADIX);
} else {
typeString = getTypeString(type);
}
typeStrings.put(type, typeString);
}
if (srcWriter != null) {
writeStaticFields();
writeStaticInitializer();
if (context.isProdMode()) {
writeLoadMethodsNative();
writeLoadSignaturesNative();
} else {
writeLoadMethodsJava();
writeLoadSignaturesJava();
}
writeConstructor();
srcWriter.commit(logger);
}
return typeSerializerClassName;
}
/*
* Create a field serializer for a type if it does not have a custom
* serializer.
*/
private void createFieldSerializer(TreeLogger logger, GeneratorContext ctx, JType type) {
Event event = SpeedTracerLogger.start(CompilerEventType.GENERATOR_RPC_FIELD_SERIALIZER);
try {
assert (type != null);
assert (serializationOracle.isSerializable(type) || deserializationOracle
.isSerializable(type));
JParameterizedType parameterizedType = type.isParameterized();
if (parameterizedType != null) {
createFieldSerializer(logger, ctx, parameterizedType.getRawType());
return;
}
/*
* Only a JClassType can reach this point in the code. JPrimitives have
* been removed because their serialization is built in, interfaces have
* been removed because they are not an instantiable type and
* parameterized types have been broken down into their raw types.
*/
assert (type.isClass() != null || type.isArray() != null);
// get custom field serializer, if available
JClassType customFieldSerializer =
SerializableTypeOracleBuilder.findCustomFieldSerializer(typeOracle, type);
if (ctx.isGeneratorResultCachingEnabled()) {
// update cached info for next iteration
if (customFieldSerializer != null) {
customFieldSerializersUsed.add(customFieldSerializer);
} else {
typesNotUsingCustomFieldSerializers.add(type);
}
// check the cache for a valid field serializer for the current type
if (findReusableCachedFieldSerializerIfAvailable(logger, ctx, type,
customFieldSerializer)) {
// we can skip re-generation of the field serializer for the current
// type
return;
}
}
// generate a new field serializer
FieldSerializerCreator creator =
new FieldSerializerCreator(logger, context, serializationOracle, deserializationOracle,
(JClassType) type, customFieldSerializer);
creator.realize(logger, ctx);
} finally {
event.end();
}
}
/*
* Create all of the necessary field serializers.
*/
private void createFieldSerializers(TreeLogger logger, GeneratorContext ctx) {
JType[] types = getSerializableTypes();
int typeCount = types.length;
for (int typeIndex = 0; typeIndex < typeCount; ++typeIndex) {
JType type = types[typeIndex];
assert (type != null);
createFieldSerializer(logger, ctx, type);
}
}
/*
* check whether we can use a previously generated version of a
* FieldSerializer. If so, mark it for reuse, and return true. Otherwise
* return false.
*/
private boolean findReusableCachedFieldSerializerIfAvailable(TreeLogger logger,
GeneratorContext ctx, JType type, JType customFieldSerializer) {
CachedGeneratorResult lastResult = ctx.getCachedGeneratorResult();
if (lastResult == null || !ctx.isGeneratorResultCachingEnabled()) {
return false;
}
String fieldSerializerName = SerializationUtils.getStandardSerializerName((JClassType) type);
if (type instanceof JClassType) {
// check that it is available for reuse
if (!lastResult.isTypeCached(fieldSerializerName)) {
if (logger.isLoggable(TreeLogger.TRACE)) {
if (ctx.getTypeOracle().findType(fieldSerializerName) == null) {
logger.log(TreeLogger.TRACE, "No cached field serializer available for "
+ type.getQualifiedSourceName());
}
}
return false;
}
} else {
return false;
}
@SuppressWarnings("unchecked")
CachedRpcTypeInformation cachedTypeInfo =
(CachedRpcTypeInformation) lastResult.getClientData(ProxyCreator.CACHED_TYPE_INFO_KEY);
assert cachedTypeInfo != null;
boolean foundMatch = false;
if (cachedTypeInfo.checkLastModifiedTime(type)
&& ((customFieldSerializer != null && cachedTypeInfo
.checkLastModifiedTime(customFieldSerializer)) || (customFieldSerializer == null && cachedTypeInfo
.checkTypeNotUsingCustomSerializer(type)))) {
// use cached version, if available
foundMatch = ctx.tryReuseTypeFromCache(fieldSerializerName);
}
if (logger.isLoggable(TreeLogger.TRACE)) {
String msg;
if (foundMatch) {
msg = "Reusing cached field serializer for " + type.getQualifiedSourceName();
} else {
msg = "Can't reuse cached field serializer for " + type.getQualifiedSourceName();
}
logger.log(TreeLogger.TRACE, msg);
}
return foundMatch;
}
private String[] getPackageAndClassName(String fullClassName) {
String className = fullClassName;
String packageName = "";
int index = -1;
if ((index = className.lastIndexOf('.')) >= 0) {
packageName = className.substring(0, index);
className = className.substring(index + 1, className.length());
}
return new String[] {packageName, className};
}
private JType[] getSerializableTypes() {
return serializableTypes;
}
private SourceWriter getSourceWriter(TreeLogger logger, GeneratorContext ctx) {
String name[] = getPackageAndClassName(typeSerializerClassName);
String packageName = name[0];
String className = name[1];
PrintWriter printWriter = ctx.tryCreate(logger, packageName, className);
if (printWriter == null) {
return null;
}
ClassSourceFileComposerFactory composerFactory =
new ClassSourceFileComposerFactory(packageName, className);
composerFactory.addImport(GWT.class.getName());
composerFactory.addImport(JsArrayString.class.getName());
composerFactory.addImport(TypeHandler.class.getName());
composerFactory.addImport(HashMap.class.getName());
composerFactory.addImport(Map.class.getName());
composerFactory.addImport(GwtScriptOnly.class.getName());
composerFactory.setSuperclass(SerializerBase.class.getName());
return composerFactory.createSourceWriter(ctx, printWriter);
}
private String getTypeString(JType type) {
String typeString =
SerializationUtils.getRpcTypeName(type) + "/"
+ SerializationUtils.getSerializationSignature(context, type);
return typeString;
}
/**
* Return true if the custom field serializer has an instantiate
* method.
*/
private boolean hasInstantiateMethod(JClassType customSerializer, JType type) {
return CustomFieldSerializerValidator.getInstantiationMethod(customSerializer,
(JClassType) type) != null;
}
/**
* Writes constructor.
*
*
*/
private void writeConstructor() {
srcWriter.println("public " + typeSerializerSimpleName + "() {");
if (context.isProdMode()) {
srcWriter.indentln("super(null, methodMapNative, null, signatureMapNative);");
} else {
srcWriter.indentln("super(methodMapJava, null, signatureMapJava, null);");
}
srcWriter.println("}");
srcWriter.println();
}
/**
* Writes a method to produce a map of type string -> class name of
* {@link TypeHandler} for Java. We are forced to use repeated helper methods to populate the map
* because of the limit on Java method size.
*
*
*/
private void writeLoadMethodsJava() {
List filteredTypes = new ArrayList();
JType[] types = getSerializableTypes();
int n = types.length;
for (int index = 0; index < n; ++index) {
JType type = types[index];
if (serializationOracle.maybeInstantiated(type)
|| deserializationOracle.maybeInstantiated(type)) {
filteredTypes.add(type);
}
}
// Write out as many helper methods as necessary.
Iterator filteredTypesIter = filteredTypes.iterator();
int numHelpers = 0;
while (filteredTypesIter.hasNext()) {
writeLoadMethodsJavaHelper(filteredTypesIter, Integer.toString(numHelpers));
numHelpers++;
}
srcWriter.println("@SuppressWarnings(\"deprecation\")");
srcWriter.println("private static Map loadMethodsJava() {");
srcWriter.indent();
srcWriter.println("Map result = new HashMap();");
// Call all the helper methods to populate the map.
for (int helperNum = 0; helperNum < numHelpers; helperNum++) {
srcWriter.println(LOAD_METHODS_JAVA_HELPER_PREFIX + Integer.toString(helperNum) +
"(result);");
}
srcWriter.println("return result;");
srcWriter.outdent();
srcWriter.println("}");
srcWriter.println();
}
/**
* Writes a helper method to add the type signatures for the specified types to the result map.
* Adds as many of the types as possible by destructively modifying the iterator but may
* finish with elements still left.
*
*
*/
private void writeLoadSignaturesJava() {
List allTypes = Arrays.asList(getSerializableTypes());
Iterator allTypesIter = allTypes.iterator();
// Write out as many helper methods as necessary.
int numHelpers = 0;
while (allTypesIter.hasNext()) {
writeLoadSignaturesJavaHelper(allTypesIter, Integer.toString(numHelpers));
numHelpers++;
}
srcWriter.println("@SuppressWarnings(\"deprecation\")");
srcWriter.println("private static Map loadSignaturesJava() {");
srcWriter.indent();
srcWriter.println("Map result = new HashMap();");
// Call all the helper methods to populate the map.
for (int helperNum = 0; helperNum < numHelpers; helperNum++) {
srcWriter.println(LOAD_SIGNATURES_JAVA_HELPER_PREFIX +
Integer.toString(helperNum) + "(result);");
}
srcWriter.println("return result;");
srcWriter.outdent();
srcWriter.println("}");
srcWriter.println();
}
/**
* Writes a helper method to produce a map of class name to type string for Java. Adds as many of
* the signatures as possible by destructively modifying the iterator but may finish with elements
* still left.
*
*
* private static final Map<String, String> methodMapJava;
* private static final MethodMap methodMapNative;
* private static final Map<String<?>, String> signatureMapJava;
* private static final JsArrayString signatureMapNative;
*
*/
private void writeStaticFields() {
if (context.isProdMode()) {
srcWriter.println("private static final MethodMap methodMapNative;");
srcWriter.println("private static final JsArrayString signatureMapNative;");
} else {
srcWriter.println("private static final Map methodMapJava;");
srcWriter.println("private static final Map signatureMapJava;");
}
srcWriter.println();
}
/**
* Statically initializes the class fields either for script or JVM.
*
*
