| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.cassandra.io.sstable; |
| |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Objects; |
| import java.util.concurrent.CopyOnWriteArrayList; |
| import java.util.regex.Pattern; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.base.Preconditions; |
| import com.google.common.collect.Iterables; |
| |
| import org.apache.cassandra.io.sstable.format.SSTableFormat; |
| import org.apache.cassandra.io.sstable.format.SSTableFormat.Components.Types; |
| |
| /** |
| * SSTables are made up of multiple components in separate files. Components are |
| * identified by a type and an id, but required unique components (such as the Data |
| * and Index files) may have implicit ids assigned to them. |
| */ |
| public class Component |
| { |
| public static final char separator = '-'; |
| |
| /** |
| * WARNING: Be careful while changing the names or string representation of the enum |
| * members. Streaming code depends on the names during streaming (Ref: CASSANDRA-14556). |
| */ |
| public final static class Type |
| { |
| private final static CopyOnWriteArrayList<Type> typesCollector = new CopyOnWriteArrayList<>(); |
| |
| public static final List<Type> all = Collections.unmodifiableList(typesCollector); |
| |
| public final int id; |
| public final String name; |
| public final String repr; |
| private final Component singleton; |
| |
| @SuppressWarnings("rawtypes") |
| public final Class<? extends SSTableFormat> formatClass; |
| |
| /** |
| * Creates a new non-singleton type and registers it a global type registry - see {@link #registerType(Type)}. |
| * |
| * @param name type name, must be unique for this and all parent formats |
| * @param repr the regular expression to be used to recognize a name represents this type |
| * @param formatClass format class for which this type is defined for |
| */ |
| public static Type create(String name, String repr, Class<? extends SSTableFormat<?, ?>> formatClass) |
| { |
| return new Type(name, repr, false, formatClass); |
| } |
| |
| /** |
| * Creates a new singleton type and registers it in a global type registry - see {@link #registerType(Type)}. |
| * |
| * @param name type name, must be unique for this and all parent formats |
| * @param repr the regular expression to be used to recognize a name represents this type |
| * @param formatClass format class for which this type is defined for |
| */ |
| public static Type createSingleton(String name, String repr, Class<? extends SSTableFormat<?, ?>> formatClass) |
| { |
| return new Type(name, repr, true, formatClass); |
| } |
| |
| private Type(String name, String repr, boolean isSingleton, Class<? extends SSTableFormat<?, ?>> formatClass) |
| { |
| this.name = Objects.requireNonNull(name); |
| this.repr = repr; |
| this.id = typesCollector.size(); |
| this.formatClass = formatClass == null ? SSTableFormat.class : formatClass; |
| this.singleton = isSingleton ? new Component(this) : null; |
| |
| registerType(this); |
| } |
| |
| /** |
| * If you have two formats registered, they may both define a type say `INDEX`. It is allowed even though |
| * they have the same name because they are not in the same branch. Though, we cannot let a custom type |
| * define a type `TOC` which is declared on the top level. |
| * So, e.g. given we have `TOC@SSTableFormat`, and `BigFormat` tries to define `TOC@BigFormat`, we should |
| * forbid that; but, given we have `INDEX@BigFormat`, we should allow to define `INDEX@TrieFormat` as those |
| * types are be distinguishable via format type. |
| * |
| * @param type a type to be registered |
| */ |
| private static void registerType(Type type) |
| { |
| synchronized (typesCollector) |
| { |
| if (typesCollector.stream().anyMatch(t -> (Objects.equals(t.name, type.name) || Objects.equals(t.repr, type.repr)) && (t.formatClass.isAssignableFrom(type.formatClass)))) |
| throw new AssertionError("Type named " + type.name + " is already registered"); |
| |
| typesCollector.add(type); |
| } |
| } |
| |
| @VisibleForTesting |
| public static Type fromRepresentation(String repr, SSTableFormat<?, ?> format) |
| { |
| for (Type type : Type.all) |
| { |
| if (type.repr != null && Pattern.matches(type.repr, repr) && type.formatClass.isAssignableFrom(format.getClass())) |
| return type; |
| } |
| return Types.CUSTOM; |
| } |
| |
| public static Component createComponent(String repr, SSTableFormat<?, ?> format) |
| { |
| Type type = fromRepresentation(repr, format); |
| if (type.singleton != null) |
| return type.singleton; |
| else |
| return new Component(type, repr); |
| } |
| |
| @Override |
| public boolean equals(Object o) |
| { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| Type type = (Type) o; |
| return id == type.id; |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return id; |
| } |
| |
| @Override |
| public String toString() |
| { |
| return name; |
| } |
| |
| public Component getSingleton() |
| { |
| return Objects.requireNonNull(singleton); |
| } |
| |
| public Component createComponent(String repr) |
| { |
| Preconditions.checkArgument(singleton == null); |
| return new Component(this, repr); |
| } |
| } |
| |
| public final Type type; |
| public final String name; |
| public final int hashCode; |
| |
| private Component(Type type) |
| { |
| this(type, type.repr); |
| } |
| |
| private Component(Type type, String name) |
| { |
| assert name != null : "Component name cannot be null"; |
| |
| this.type = type; |
| this.name = name; |
| this.hashCode = Objects.hash(type, name); |
| } |
| |
| /** |
| * @return The unique (within an sstable) name for this component. |
| */ |
| public String name() |
| { |
| return name; |
| } |
| |
| /** |
| * Parse the component part of a sstable filename into a {@code Component} object. |
| * |
| * @param name a string representing a sstable component. |
| * @return the component corresponding to {@code name}. Note that this always return a component as an unrecognized |
| * name is parsed into a CUSTOM component. |
| */ |
| public static Component parse(String name, SSTableFormat<?, ?> format) |
| { |
| return Type.createComponent(name, format); |
| } |
| |
| public static Iterable<Component> getSingletonsFor(SSTableFormat<?, ?> format) |
| { |
| return Iterables.transform(Iterables.filter(Type.all, t -> t.singleton != null && t.formatClass.isAssignableFrom(format.getClass())), t -> t.singleton); |
| } |
| |
| public static Iterable<Component> getSingletonsFor(Class<? extends SSTableFormat<?, ?>> formatClass) |
| { |
| return Iterables.transform(Iterables.filter(Type.all, t -> t.singleton != null && t.formatClass.isAssignableFrom(formatClass)), t -> t.singleton); |
| } |
| |
| public boolean isValidFor(Descriptor descriptor) |
| { |
| return type.formatClass.isAssignableFrom(descriptor.version.format.getClass()); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return this.name(); |
| } |
| |
| @Override |
| public boolean equals(Object o) |
| { |
| if (o == this) |
| return true; |
| if (!(o instanceof Component)) |
| return false; |
| Component that = (Component) o; |
| return this.hashCode == that.hashCode && this.type == that.type && this.name.equals(that.name); |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return hashCode; |
| } |
| } |