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Thread safe method cache

This commit is contained in:
Chris Conroy 2015-10-27 20:01:38 -04:00
parent fe101c10bc
commit 7abeb16080
1 changed files with 20 additions and 11 deletions
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31
proto/src/main/java/com/google/gson/protobuf/ProtoTypeAdapter.java
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@ -20,6 +20,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.base.CaseFormat;
import com.google.common.base.Converter;
import com.google.common.collect.MapMaker;
import com.google.gson.JsonArray;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
@ -44,10 +45,10 @@ import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentMap;
/**
* GSON type adapter for protocol buffers that knows how to serialize enums either by using their
@ -190,6 +191,9 @@ public class ProtoTypeAdapter
private static final com.google.protobuf.Descriptors.FieldDescriptor.Type ENUM_TYPE =
com.google.protobuf.Descriptors.FieldDescriptor.Type.ENUM;
private static final ConcurrentMap<String, Map<Class<?>, Method>> mapOfMapOfMethods =
new MapMaker().makeMap();
private final EnumSerialization enumSerialization;
private final Converter<String, String> fieldNameSerializationFormat;
private final Set<Extension<FieldOptions, String>> serializedNameExtensions;
@ -380,18 +384,23 @@ public class ProtoTypeAdapter
}
}
private static Method getCachedMethod(Class<?> clazz, String methodName)
throws NoSuchMethodException {
if (!mapOfMapOfMethods.containsKey(methodName)) {
mapOfMapOfMethods.put(methodName, new HashMap<Class<?>, Method>());
}
private static Method getCachedMethod(Class<?> clazz, String methodName,
Class<?>... methodParamTypes) throws NoSuchMethodException {
Map<Class<?>, Method> mapOfMethods = mapOfMapOfMethods.get(methodName);
if (!mapOfMethods.containsKey(clazz)) {
mapOfMethods.put(clazz, clazz.getMethod(methodName));
if (mapOfMethods == null) {
mapOfMethods = new MapMaker().makeMap();
Map<Class<?>, Method> previous =
mapOfMapOfMethods.putIfAbsent(methodName, mapOfMethods);
mapOfMethods = previous == null ? mapOfMethods : previous;
}
return mapOfMethods.get(clazz);
Method method = mapOfMethods.get(clazz);
if (method == null) {
method = clazz.getMethod(methodName, methodParamTypes);
mapOfMethods.putIfAbsent(clazz, method);
// NB: it doesn't matter which method we return in the event of a race.
}
return method;
}
private static Map<String, Map<Class<?>, Method>> mapOfMapOfMethods =
new HashMap<String, Map<Class<?>, Method>>();
}