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DefaultValueSnapshotter.java
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DefaultValueSnapshotter.java
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/*
* Copyright 2017 the original author or authors.
*
* 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 org.gradle.internal.snapshot.impl;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import org.gradle.api.attributes.Attribute;
import org.gradle.internal.hash.ClassLoaderHierarchyHasher;
import org.gradle.internal.isolation.Isolatable;
import org.gradle.internal.isolation.IsolatableFactory;
import org.gradle.internal.logging.text.TreeFormatter;
import org.gradle.internal.snapshot.ValueSnapshot;
import org.gradle.internal.snapshot.ValueSnapshotter;
import org.gradle.internal.snapshot.ValueSnapshottingException;
import org.gradle.internal.state.Managed;
import org.gradle.internal.state.ManagedFactoryRegistry;
import javax.annotation.Nullable;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.lang.reflect.Array;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
public class DefaultValueSnapshotter implements ValueSnapshotter, IsolatableFactory {
private final ValueVisitor<ValueSnapshot> valueSnapshotValueVisitor;
private final ValueVisitor<Isolatable<?>> isolatableValueVisitor;
public DefaultValueSnapshotter(ClassLoaderHierarchyHasher classLoaderHasher, ManagedFactoryRegistry managedFactoryRegistry) {
valueSnapshotValueVisitor = new ValueSnapshotVisitor(classLoaderHasher);
isolatableValueVisitor = new IsolatableVisitor(classLoaderHasher, managedFactoryRegistry);
}
@Override
public ValueSnapshot snapshot(@Nullable Object value) throws ValueSnapshottingException {
return processValue(value, valueSnapshotValueVisitor);
}
@Override
public ValueSnapshot snapshot(Object value, ValueSnapshot candidate) throws ValueSnapshottingException {
return candidate.snapshot(value, this);
}
@SuppressWarnings("unchecked")
@Override
public <T> Isolatable<T> isolate(@Nullable T value) {
try {
return (Isolatable<T>) processValue(value, isolatableValueVisitor);
} catch (Throwable t) {
throw new IsolationException(value, t);
}
}
private <T> T processValue(@Nullable Object value, ValueVisitor<T> visitor) {
if (value == null) {
return visitor.nullValue();
}
if (value instanceof String) {
return visitor.stringValue((String) value);
}
if (value instanceof Boolean) {
return visitor.booleanValue((Boolean) value);
}
if (value instanceof List) {
List<?> list = (List<?>) value;
if (list.size() == 0) {
return visitor.emptyList();
}
ImmutableList.Builder<T> builder = ImmutableList.builderWithExpectedSize(list.size());
for (Object element : list) {
builder.add(processValue(element, visitor));
}
return visitor.list(builder.build());
}
if (value instanceof Enum) {
return visitor.enumValue((Enum) value);
}
if (value instanceof Class<?>) {
return visitor.classValue((Class<?>) value);
}
if (value.getClass().equals(File.class)) {
// Not subtypes as we don't know whether they are immutable or not
return visitor.fileValue((File) value);
}
if (value instanceof Number) {
if (value instanceof Integer) {
return visitor.integerValue((Integer) value);
}
if (value instanceof Long) {
return visitor.longValue((Long) value);
}
if (value instanceof Short) {
return visitor.shortValue((Short) value);
}
}
if (value instanceof Set) {
Set<?> set = (Set<?>) value;
ImmutableSet.Builder<T> builder = ImmutableSet.builderWithExpectedSize(set.size());
for (Object element : set) {
builder.add(processValue(element, visitor));
}
return visitor.set(builder.build());
}
if (value instanceof Map) {
Map<?, ?> map = (Map<?, ?>) value;
ImmutableList.Builder<MapEntrySnapshot<T>> builder = ImmutableList.builderWithExpectedSize(map.size());
for (Map.Entry<?, ?> entry : map.entrySet()) {
builder.add(new MapEntrySnapshot<T>(processValue(entry.getKey(), visitor), processValue(entry.getValue(), visitor)));
}
if (value instanceof Properties) {
return visitor.properties(builder.build());
} else {
return visitor.map(builder.build());
}
}
if (value.getClass().isArray()) {
int length = Array.getLength(value);
if (length == 0) {
return visitor.emptyArray(value.getClass().getComponentType());
}
ImmutableList.Builder<T> builder = ImmutableList.builderWithExpectedSize(length);
for (int i = 0; i < length; i++) {
Object element = Array.get(value, i);
builder.add(processValue(element, visitor));
}
return visitor.array(builder.build(), value.getClass().getComponentType());
}
if (value instanceof Attribute) {
return visitor.attributeValue((Attribute<?>) value);
}
if (value instanceof Managed) {
Managed managed = (Managed) value;
if (managed.isImmutable()) {
return visitor.managedImmutableValue(managed);
} else {
// May (or may not) be mutable - unpack the state
T state = processValue(managed.unpackState(), visitor);
return visitor.managedValue(managed, state);
}
}
if (value instanceof Isolatable) {
return visitor.fromIsolatable((Isolatable<?>) value);
}
// Fall back to serialization
return serialize(value, visitor);
}
private <T> T serialize(Object value, ValueVisitor<T> visitor) {
ByteArrayOutputStream outputStream;
try {
outputStream = new ByteArrayOutputStream();
ObjectOutputStream objectStr = new ObjectOutputStream(outputStream);
objectStr.writeObject(value);
objectStr.flush();
} catch (IOException e) {
TreeFormatter formatter = new TreeFormatter();
formatter.node("Could not serialize value of type ");
formatter.appendType(value.getClass());
throw new ValueSnapshottingException(formatter.toString(), e);
}
return visitor.serialized(value, outputStream.toByteArray());
}
private interface ValueVisitor<T> {
T nullValue();
T stringValue(String value);
T booleanValue(Boolean value);
T enumValue(Enum value);
T classValue(Class<?> value);
T fileValue(File value);
T integerValue(Integer value);
T longValue(Long value);
T shortValue(Short value);
T attributeValue(Attribute<?> value);
T managedValue(Managed value, T state);
T managedImmutableValue(Managed managed);
T fromIsolatable(Isolatable<?> value);
T emptyArray(Class<?> arrayType);
T array(ImmutableList<T> elements, Class<?> arrayType);
T emptyList();
T list(ImmutableList<T> elements);
T set(ImmutableSet<T> elements);
T map(ImmutableList<MapEntrySnapshot<T>> elements);
T properties(ImmutableList<MapEntrySnapshot<T>> elements);
T serialized(Object value, byte[] serializedValue);
}
private static class ValueSnapshotVisitor implements ValueVisitor<ValueSnapshot> {
private final ClassLoaderHierarchyHasher classLoaderHasher;
ValueSnapshotVisitor(ClassLoaderHierarchyHasher classLoaderHasher) {
this.classLoaderHasher = classLoaderHasher;
}
@Override
public ValueSnapshot nullValue() {
return NullValueSnapshot.INSTANCE;
}
@Override
public ValueSnapshot stringValue(String value) {
return new StringValueSnapshot(value);
}
@Override
public ValueSnapshot booleanValue(Boolean value) {
return value.equals(Boolean.TRUE) ? BooleanValueSnapshot.TRUE : BooleanValueSnapshot.FALSE;
}
@Override
public ValueSnapshot integerValue(Integer value) {
return new IntegerValueSnapshot(value);
}
@Override
public ValueSnapshot longValue(Long value) {
return new LongValueSnapshot(value);
}
@Override
public ValueSnapshot shortValue(Short value) {
return new ShortValueSnapshot(value);
}
@Override
public ValueSnapshot enumValue(Enum value) {
return new EnumValueSnapshot(value);
}
@Override
public ValueSnapshot classValue(Class<?> value) {
return ImplementationSnapshot.of(value, classLoaderHasher);
}
@Override
public ValueSnapshot fileValue(File value) {
return new FileValueSnapshot(value);
}
@Override
public ValueSnapshot attributeValue(Attribute<?> value) {
return new AttributeDefinitionSnapshot(value, classLoaderHasher);
}
@Override
public ValueSnapshot managedImmutableValue(Managed managed) {
return new ImmutableManagedValueSnapshot(managed.publicType().getName(), (String) managed.unpackState());
}
@Override
public ValueSnapshot managedValue(Managed value, ValueSnapshot state) {
return new ManagedValueSnapshot(value.publicType().getName(), state);
}
@Override
public ValueSnapshot fromIsolatable(Isolatable<?> value) {
return value.asSnapshot();
}
@Override
public ValueSnapshot serialized(Object value, byte[] serializedValue) {
return new SerializedValueSnapshot(classLoaderHasher.getClassLoaderHash(value.getClass().getClassLoader()), serializedValue);
}
@Override
public ValueSnapshot emptyArray(Class<?> arrayType) {
return ArrayValueSnapshot.EMPTY;
}
@Override
public ValueSnapshot array(ImmutableList<ValueSnapshot> elements, Class<?> arrayType) {
return new ArrayValueSnapshot(elements);
}
@Override
public ValueSnapshot emptyList() {
return ListValueSnapshot.EMPTY;
}
@Override
public ValueSnapshot list(ImmutableList<ValueSnapshot> elements) {
return new ListValueSnapshot(elements);
}
@Override
public ValueSnapshot set(ImmutableSet<ValueSnapshot> elements) {
return new SetValueSnapshot(elements);
}
@Override
public ValueSnapshot map(ImmutableList<MapEntrySnapshot<ValueSnapshot>> elements) {
return new MapValueSnapshot(elements);
}
@Override
public ValueSnapshot properties(ImmutableList<MapEntrySnapshot<ValueSnapshot>> elements) {
return new MapValueSnapshot(elements);
}
}
private static class IsolatableVisitor implements ValueVisitor<Isolatable<?>> {
private final ClassLoaderHierarchyHasher classLoaderHasher;
private final ManagedFactoryRegistry managedFactoryRegistry;
IsolatableVisitor(ClassLoaderHierarchyHasher classLoaderHasher, ManagedFactoryRegistry managedFactoryRegistry) {
this.classLoaderHasher = classLoaderHasher;
this.managedFactoryRegistry = managedFactoryRegistry;
}
@Override
public Isolatable<?> nullValue() {
return NullValueSnapshot.INSTANCE;
}
@Override
public Isolatable<?> stringValue(String value) {
return new StringValueSnapshot(value);
}
@Override
public Isolatable<?> booleanValue(Boolean value) {
return value.equals(Boolean.TRUE) ? BooleanValueSnapshot.TRUE : BooleanValueSnapshot.FALSE;
}
@Override
public Isolatable<?> integerValue(Integer value) {
return new IntegerValueSnapshot(value);
}
@Override
public Isolatable<?> longValue(Long value) {
return new LongValueSnapshot(value);
}
@Override
public Isolatable<?> shortValue(Short value) {
return new ShortValueSnapshot(value);
}
@Override
public Isolatable<?> enumValue(Enum value) {
return new IsolatedEnumValueSnapshot(value);
}
@Override
public Isolatable<?> classValue(Class<?> value) {
throw new IsolationException(value);
}
@Override
public Isolatable<?> fileValue(File value) {
return new FileValueSnapshot(value);
}
@Override
public Isolatable<?> attributeValue(Attribute<?> value) {
return new AttributeDefinitionSnapshot(value, classLoaderHasher);
}
@Override
public Isolatable<?> managedImmutableValue(Managed managed) {
return new IsolatedImmutableManagedValue(managed, managedFactoryRegistry);
}
@Override
public Isolatable<?> managedValue(Managed value, Isolatable<?> state) {
return new IsolatedManagedValue(value.publicType(), managedFactoryRegistry.lookup(value.getFactoryId()), state);
}
@Override
public Isolatable<?> fromIsolatable(Isolatable<?> value) {
return value;
}
@Override
public Isolatable<?> serialized(Object value, byte[] serializedValue) {
return new IsolatedSerializedValueSnapshot(classLoaderHasher.getClassLoaderHash(value.getClass().getClassLoader()), serializedValue, value.getClass());
}
@Override
public Isolatable<?> emptyArray(Class<?> arrayType) {
return IsolatedArray.empty(arrayType);
}
@Override
public Isolatable<?> array(ImmutableList<Isolatable<?>> elements, Class<?> arrayType) {
return new IsolatedArray(elements, arrayType);
}
@Override
public Isolatable<?> emptyList() {
return IsolatedList.EMPTY;
}
@Override
public Isolatable<?> list(ImmutableList<Isolatable<?>> elements) {
return new IsolatedList(elements);
}
@Override
public Isolatable<?> set(ImmutableSet<Isolatable<?>> elements) {
return new IsolatedSet(elements);
}
@Override
public Isolatable<?> map(ImmutableList<MapEntrySnapshot<Isolatable<?>>> elements) {
return new IsolatedMap(elements);
}
@Override
public Isolatable<?> properties(ImmutableList<MapEntrySnapshot<Isolatable<?>>> elements) {
return new IsolatedProperties(elements);
}
}
}