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/*
* Copyright 2015 Austin Keener, Michael Ritter, Florian Spieß, and the JDA contributors
*
* 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 net.dv8tion.jda.internal.utils.cache;
import gnu.trove.map.TIntObjectMap;
import gnu.trove.map.hash.TIntObjectHashMap;
import gnu.trove.set.TIntSet;
import gnu.trove.set.hash.TIntHashSet;
import net.dv8tion.jda.api.JDA;
import net.dv8tion.jda.api.utils.ClosableIterator;
import net.dv8tion.jda.api.utils.LockIterator;
import net.dv8tion.jda.api.utils.MiscUtil;
import net.dv8tion.jda.api.utils.cache.CacheView;
import net.dv8tion.jda.api.utils.cache.ShardCacheView;
import net.dv8tion.jda.internal.utils.ChainedClosableIterator;
import net.dv8tion.jda.internal.utils.Checks;
import net.dv8tion.jda.internal.utils.Helpers;
import net.dv8tion.jda.internal.utils.UnlockHook;
import org.apache.commons.collections4.iterators.ObjectArrayIterator;
import javax.annotation.Nonnull;
import java.util.*;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import java.util.function.Consumer;
import java.util.function.Supplier;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
public class ShardCacheViewImpl extends ReadWriteLockCache implements ShardCacheView
{
protected static final JDA[] EMPTY_ARRAY = new JDA[0];
protected final TIntObjectMap elements;
public ShardCacheViewImpl()
{
this.elements = new TIntObjectHashMap<>();
}
public ShardCacheViewImpl(int initialCapacity)
{
this.elements = new TIntObjectHashMap<>(initialCapacity);
}
public void clear()
{
try (UnlockHook hook = writeLock())
{
elements.clear();
}
}
public JDA remove(int shardId)
{
try (UnlockHook hook = writeLock())
{
return elements.remove(shardId);
}
}
public TIntObjectMap getMap()
{
if (!lock.writeLock().isHeldByCurrentThread())
throw new IllegalStateException("Cannot access map without holding write lock!");
return elements;
}
public TIntSet keySet()
{
try (UnlockHook hook = readLock())
{
return new TIntHashSet(elements.keySet());
}
}
@Override
public void forEach(Consumer action)
{
Objects.requireNonNull(action);
try (UnlockHook hook = readLock())
{
for (JDA shard : elements.valueCollection())
{
action.accept(shard);
}
}
}
@Nonnull
@Override
public List asList()
{
if (isEmpty())
return Collections.emptyList();
try (UnlockHook hook = readLock())
{
List list = getCachedList();
if (list != null)
return list;
return cache(new ArrayList<>(elements.valueCollection()));
}
}
@Nonnull
@Override
public Set asSet()
{
if (isEmpty())
return Collections.emptySet();
try (UnlockHook hook = readLock())
{
Set set = getCachedSet();
if (set != null)
return set;
return cache(new HashSet<>(elements.valueCollection()));
}
}
@Nonnull
@Override
public LockIterator lockedIterator()
{
ReentrantReadWriteLock.ReadLock readLock = lock.readLock();
MiscUtil.tryLock(readLock);
try
{
Iterator directIterator = elements.valueCollection().iterator();
return new LockIterator<>(directIterator, readLock);
}
catch (Throwable t)
{
readLock.unlock();
throw t;
}
}
@Override
public long size()
{
return elements.size();
}
@Override
public boolean isEmpty()
{
return elements.isEmpty();
}
@Nonnull
@Override
public List getElementsByName(@Nonnull String name, boolean ignoreCase)
{
Checks.notEmpty(name, "Name");
if (elements.isEmpty())
return Collections.emptyList();
try (UnlockHook hook = readLock())
{
List list = new LinkedList<>();
for (JDA elem : elements.valueCollection())
{
String elementName = elem.getShardInfo().getShardString();
if (elementName != null)
{
if (ignoreCase)
{
if (elementName.equalsIgnoreCase(name))
list.add(elem);
}
else
{
if (elementName.equals(name))
list.add(elem);
}
}
}
return list;
}
}
@Override
public Spliterator spliterator()
{
try (UnlockHook hook = readLock())
{
return Spliterators.spliterator(iterator(), size(), Spliterator.IMMUTABLE | Spliterator.NONNULL);
}
}
@Nonnull
@Override
public Stream stream()
{
return StreamSupport.stream(spliterator(), false);
}
@Nonnull
@Override
public Stream parallelStream()
{
return StreamSupport.stream(spliterator(), true);
}
@Nonnull
@Override
public Iterator iterator()
{
try (UnlockHook hook = readLock())
{
JDA[] arr = elements.values(EMPTY_ARRAY);
return new ObjectArrayIterator<>(arr);
}
}
@Override
public JDA getElementById(int id)
{
try (UnlockHook hook = readLock())
{
return this.elements.get(id);
}
}
@Override
public int hashCode()
{
try (UnlockHook hook = readLock())
{
return elements.hashCode();
}
}
@Override
public boolean equals(Object obj)
{
if (obj == this)
return true;
if (!(obj instanceof ShardCacheViewImpl))
return false;
ShardCacheViewImpl view = (ShardCacheViewImpl) obj;
try (UnlockHook hook = readLock(); UnlockHook otherHook = view.readLock())
{
return this.elements.equals(view.elements);
}
}
@Override
public String toString()
{
return asList().toString();
}
public static class UnifiedShardCacheViewImpl implements ShardCacheView
{
protected final Supplier> generator;
public UnifiedShardCacheViewImpl(Supplier> generator)
{
this.generator = generator;
}
@Override
public long size()
{
return distinctStream().mapToLong(CacheView::size).sum();
}
@Override
public boolean isEmpty()
{
return generator.get().allMatch(CacheView::isEmpty);
}
@Nonnull
@Override
public List asList()
{
List list = new ArrayList<>();
stream().forEach(list::add);
return Collections.unmodifiableList(list);
}
@Nonnull
@Override
public Set asSet()
{
Set set = new HashSet<>();
generator.get().flatMap(CacheView::stream).forEach(set::add);
return Collections.unmodifiableSet(set);
}
@Nonnull
@Override
public ClosableIterator lockedIterator()
{
Iterator gen = this.generator.get().iterator();
return new ChainedClosableIterator<>(gen);
}
@Nonnull
@Override
public List getElementsByName(@Nonnull String name, boolean ignoreCase)
{
return distinctStream()
.flatMap(view -> view.getElementsByName(name, ignoreCase).stream())
.collect(Helpers.toUnmodifiableList());
}
@Override
public JDA getElementById(int id)
{
return generator.get()
.map(view -> view.getElementById(id))
.filter(Objects::nonNull)
.findFirst().orElse(null);
}
@Nonnull
@Override
public Stream stream()
{
return generator.get().flatMap(CacheView::stream).distinct();
}
@Nonnull
@Override
public Stream parallelStream()
{
return generator.get().flatMap(CacheView::parallelStream).distinct();
}
@Nonnull
@Override
public Iterator iterator()
{
return stream().iterator();
}
protected Stream distinctStream()
{
return generator.get().distinct();
}
}
}