| /** |
| * 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.apex.malhar.lib.state.spillable; |
| |
| import java.util.Collection; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.NoSuchElementException; |
| |
| import javax.validation.constraints.NotNull; |
| |
| import org.apache.apex.malhar.lib.utils.serde.Serde; |
| import org.apache.commons.lang3.mutable.MutableInt; |
| import org.apache.hadoop.classification.InterfaceStability; |
| |
| import com.esotericsoftware.kryo.DefaultSerializer; |
| import com.esotericsoftware.kryo.serializers.FieldSerializer; |
| import com.google.common.base.Preconditions; |
| |
| import com.datatorrent.api.Context; |
| import com.datatorrent.netlet.util.Slice; |
| |
| /** |
| * A Spillable implementation of {@link List} backed by a {@link SpillableStateStore}. |
| * @param <T> The type of object stored in the {@link SpillableSetImpl}. |
| * |
| * @since 3.5.0 |
| */ |
| @DefaultSerializer(FieldSerializer.class) |
| @InterfaceStability.Evolving |
| public class SpillableSetImpl<T> implements Spillable.SpillableSet<T>, Spillable.SpillableComponent |
| { |
| private static class ListNode<T> |
| { |
| ListNode() |
| { |
| } |
| |
| ListNode(boolean valid, T next) |
| { |
| this.valid = valid; |
| this.next = next; |
| } |
| |
| boolean valid; |
| T next; |
| } |
| |
| public static class SerdeListNodeSlice<T> implements Serde<ListNode<T>, Slice> |
| { |
| private Serde<T, Slice> serde; |
| private static Slice falseSlice = new Slice(new byte[]{0}); |
| private static Slice trueSlice = new Slice(new byte[]{1}); |
| |
| public SerdeListNodeSlice(@NotNull Serde<T, Slice> serde) |
| { |
| this.serde = Preconditions.checkNotNull(serde); |
| } |
| |
| @Override |
| public Slice serialize(ListNode<T> object) |
| { |
| int size = 0; |
| |
| Slice slice1 = object.valid ? trueSlice : falseSlice; |
| size += 1; |
| Slice slice2 = serde.serialize(object.next); |
| size += slice2.length; |
| |
| byte[] bytes = new byte[size]; |
| System.arraycopy(slice1.buffer, slice1.offset, bytes, 0, slice1.length); |
| System.arraycopy(slice2.buffer, slice2.offset, bytes, slice1.length, slice2.length); |
| |
| return new Slice(bytes); |
| } |
| |
| @Override |
| public ListNode<T> deserialize(Slice slice, MutableInt offset) |
| { |
| ListNode<T> result = new ListNode<>(); |
| result.valid = slice.buffer[offset.intValue()] != 0; |
| offset.add(1); |
| result.next = serde.deserialize(slice, offset); |
| return result; |
| } |
| |
| @Override |
| public ListNode<T> deserialize(Slice object) |
| { |
| return deserialize(object, new MutableInt(0)); |
| } |
| } |
| |
| @NotNull |
| private SpillableStateStore store; |
| @NotNull |
| private SpillableMapImpl<T, ListNode<T>> map; |
| |
| private T head; |
| private int size; |
| |
| private SpillableSetImpl() |
| { |
| //for kryo |
| } |
| |
| public SpillableStateStore getStore() |
| { |
| return store; |
| } |
| |
| /** |
| * Creates a {@link SpillableSetImpl}. |
| * @param bucketId The Id of the bucket used to store this |
| * {@link SpillableSetImpl} in the provided {@link SpillableStateStore}. |
| * @param prefix The Id of this {@link SpillableSetImpl}. |
| * @param store The {@link SpillableStateStore} in which to spill to. |
| * @param serde The {@link Serde} to use when serializing and deserializing data. |
| */ |
| public SpillableSetImpl(long bucketId, @NotNull byte[] prefix, |
| @NotNull SpillableStateStore store, |
| @NotNull Serde<T, Slice> serde) |
| { |
| this.store = Preconditions.checkNotNull(store); |
| |
| map = new SpillableMapImpl<>(store, prefix, bucketId, serde, new SerdeListNodeSlice(serde)); |
| } |
| |
| public void setSize(int size) |
| { |
| Preconditions.checkArgument(size >= 0); |
| this.size = size; |
| } |
| |
| public void setHead(T head) |
| { |
| Preconditions.checkNotNull(head); |
| this.head = head; |
| } |
| |
| public T getHead() |
| { |
| return head; |
| } |
| |
| @Override |
| public int size() |
| { |
| return size; |
| } |
| |
| @Override |
| public boolean isEmpty() |
| { |
| return size == 0; |
| } |
| |
| @Override |
| public boolean contains(Object o) |
| { |
| T t = (T)o; |
| ListNode<T> node = map.get(t); |
| return node != null && node.valid; |
| } |
| |
| @Override |
| public Iterator<T> iterator() |
| { |
| return new Iterator<T>() |
| { |
| T cur = head; |
| T prev = null; |
| |
| @Override |
| public boolean hasNext() |
| { |
| while (cur != null) { |
| ListNode<T> node = map.get(cur); |
| if (node.valid) { |
| return true; |
| } |
| if (cur.equals(node.next)) { |
| break; |
| } else { |
| cur = node.next; |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public T next() |
| { |
| while (cur != null) { |
| ListNode<T> node = map.get(cur); |
| try { |
| if (node.valid) { |
| prev = cur; |
| return prev; |
| } |
| } finally { |
| if (cur.equals(node.next)) { |
| cur = null; |
| } else { |
| cur = node.next; |
| } |
| } |
| } |
| throw new NoSuchElementException(); |
| } |
| |
| @Override |
| public void remove() |
| { |
| ListNode<T> node = map.get(prev); |
| node.valid = false; |
| map.put(prev, node); |
| size--; |
| } |
| }; |
| } |
| |
| @Override |
| public Object[] toArray() |
| { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public <T1> T1[] toArray(T1[] t1s) |
| { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public boolean add(T t) |
| { |
| Preconditions.checkArgument((size() + 1) > 0); |
| ListNode<T> node = map.get(t); |
| if (node == null) { |
| map.put(t, new ListNode<>(true, head == null ? t : head)); |
| head = t; |
| size++; |
| return true; |
| } else if (!node.valid) { |
| node.valid = true; |
| map.put(t, node); |
| size++; |
| return true; |
| } else { |
| return false; |
| } |
| } |
| |
| @Override |
| public boolean remove(Object o) |
| { |
| T t = (T)o; |
| ListNode<T> node = map.get(t); |
| if (node == null || !node.valid) { |
| return false; |
| } else { |
| node.valid = false; |
| map.put(t, node); |
| size--; |
| return true; |
| } |
| } |
| |
| @Override |
| public boolean containsAll(Collection<?> collection) |
| { |
| for (Object item : collection) { |
| if (!contains(item)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| @Override |
| public boolean addAll(Collection<? extends T> collection) |
| { |
| for (T element: collection) { |
| add(element); |
| } |
| |
| return true; |
| } |
| |
| @Override |
| public boolean removeAll(Collection<?> collection) |
| { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public boolean retainAll(Collection<?> collection) |
| { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public void clear() |
| { |
| Iterator<T> it = iterator(); |
| while (it.hasNext()) { |
| it.next(); |
| it.remove(); |
| } |
| } |
| |
| @Override |
| public void setup(Context.OperatorContext context) |
| { |
| map.setup(context); |
| } |
| |
| @Override |
| public void beginWindow(long windowId) |
| { |
| map.beginWindow(windowId); |
| } |
| |
| @Override |
| public void endWindow() |
| { |
| map.endWindow(); |
| } |
| |
| @Override |
| public void teardown() |
| { |
| map.teardown(); |
| } |
| } |