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/*
* Copyright (c) 2020 Oracle and/or its affiliates.
*
* Licensed under the Universal Permissive License v 1.0 as shown at
* http://oss.oracle.com/licenses/upl.
*/
package com.oracle.coherence.client;
import com.google.protobuf.ByteString;
import com.oracle.coherence.grpc.EntryResult;
import com.tangosol.net.NamedCache;
import com.tangosol.net.RequestIncompleteException;
import com.tangosol.util.ConverterCollections;
import com.tangosol.util.PagedIterator;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Map;
import java.util.concurrent.ExecutionException;
import java.util.stream.Collectors;
/**
* A base class for implementations of collections related to a remote {@link AsyncNamedCacheClient},
* for example key set, entry set and values.
*
* This {@link Collection} implementation allows removal but does not allow additions to the
* collection. Methods {@link #add(Object)} {@link #addAll(Collection)} will throw an
* {@link UnsupportedOperationException}.
*
* Some methods in this class are intentionally inefficient partly due to their being a more efficient
* means to perform the same task using the underlying {@link AsyncNamedCacheClient} and partly to ensure
* that using this class on a client will not cause all of the data from the underlying
* {@link AsyncNamedCacheClient} to be pulled back to the caller in one result.
*
* @author Jonathan Knight 2019.11.12
* @since 20.06
*/
public abstract class RemoteCollection
implements Collection
{
// ----- constructors ---------------------------------------------------
protected RemoteCollection(AsyncNamedCacheClient client)
{
this.f_client = client;
}
// ----- Collection methods ---------------------------------------------
@Override
public int size()
{
try
{
return f_client.size().get();
}
catch (InterruptedException | ExecutionException e)
{
throw new RequestIncompleteException(e);
}
}
@Override
public boolean isEmpty()
{
try
{
return f_client.isEmpty().get();
}
catch (InterruptedException | ExecutionException e)
{
throw new RequestIncompleteException(e);
}
}
@Override
public boolean add(T t)
{
throw new UnsupportedOperationException("add operations are not supported");
}
@Override
public boolean addAll(Collection c)
{
throw new UnsupportedOperationException("add operations are not supported");
}
@Override
public void clear()
{
try
{
f_client.clear().get();
}
catch (InterruptedException | ExecutionException e)
{
throw new RequestIncompleteException(e);
}
}
@Override
public boolean containsAll(Collection colKeys)
{
if (colKeys == null)
{
throw new NullPointerException("collection parameter cannot be null");
}
if (colKeys.isEmpty())
{
return true;
}
for (Object o : colKeys)
{
if (!contains(o))
{
return false;
}
}
return true;
}
@Override
public boolean removeAll(Collection colKeys)
{
boolean fModified = false;
if (size() > colKeys.size())
{
for (Object colKey : colKeys)
{
fModified |= remove(colKey);
}
}
else
{
for (Iterator iter = iterator(); iter.hasNext(); )
{
if (colKeys.contains(iter.next()))
{
iter.remove();
fModified = true;
}
}
}
return fModified;
}
@Override
public boolean retainAll(Collection colKeys)
{
boolean fModified = false;
for (Iterator iter = iterator(); iter.hasNext(); )
{
Object o = iter.next();
if (!colKeys.contains(o))
{
iter.remove();
fModified = true;
}
}
return fModified;
}
@Override
public boolean equals(Object other)
{
if (other == this)
{
return true;
}
if (other instanceof Collection)
{
Collection colOther = (Collection) other;
if (colOther.size() != size())
{
return false;
}
try
{
return containsAll(colOther);
}
catch (ClassCastException | NullPointerException unused)
{
return false;
}
}
return false;
}
@Override
public int hashCode()
{
int h = 0;
for (T obj : this)
{
if (obj != null)
{
h += obj.hashCode();
}
}
return h;
}
// ----- Object methods -------------------------------------------------
@Override
public String toString()
{
return getClass().getSimpleName() + "(name='" + f_client.getCacheName() + "')";
}
// ----- helper methods -------------------------------------------------
/**
* Obtain the underlying {@link NamedCache}.
*
* @return the underlying {@link NamedCache}
*/
protected AsyncNamedCacheClient getCache()
{
return f_client;
}
/**
* Create an {@link EntryAdvancer} to use in a {@link PagedIterator}.
*
* @return an {@link EntryAdvancer} to use in a {@link PagedIterator}
*/
protected EntryAdvancer createEntryAdvancer()
{
return new EntryAdvancer<>(getCache());
}
// ----- inner class: EntryAdvancer -------------------------------------
/**
* A {@link PagedIterator.Advancer} to support a
* {@link PagedIterator} over an entry set.
*/
protected static class EntryAdvancer
implements PagedIterator.Advancer
{
// ----- constructors -----------------------------------------------
/**
* Constructs a new {@code EntryAdvancer} using the provided {@link AsyncNamedCacheClient}.
*
* @param client the async client
*/
protected EntryAdvancer(AsyncNamedCacheClient client)
{
this.m_client = client;
}
// ----- Advancer interface -----------------------------------------
@Override
public void remove(Object oCurr)
{
Map.Entry entry = (Map.Entry) oCurr;
try
{
m_client.removeInternal(entry.getKey()).get();
}
catch (InterruptedException | ExecutionException e)
{
throw new RequestIncompleteException(e);
}
}
@Override
public Collection nextPage()
{
if (m_exhausted)
{
return null;
}
LinkedList list = m_client.getEntriesPage(m_cookie).collect(Collectors.toCollection(LinkedList::new));
if (list.size() > 0)
{
m_cookie = list.poll().getCookie();
}
else
{
m_cookie = null;
}
m_exhausted = m_cookie == null || m_cookie.isEmpty();
// Use ConverterCollections so that deserialization is only done if for entries as they
// are iterated over. This is more efficient that deserializing all of the entries
// now as there is no guarantee that the caller will actually iterate over the whole
// entry set or that they will call getKey() or getValue() on all entries.
Collection> entries = ConverterCollections
.getCollection(list, this::fromEntryResult, this::toEntryResult);
return ConverterCollections.getEntrySet(entries, m_client::fromByteString, m_client::toByteString,
m_client::fromByteString, m_client::toByteString);
}
// ----- helper methods ---------------------------------------------
/**
* Convert a {@link EntryResult} to a {@link Map.Entry} where the
* key and value are {@link ByteString} instances.
*
* @param result the {@link EntryResult} to wrap in a {@link Map.Entry}
*
* @return a {@link Map.Entry} that wraps an {@link EntryResult}
*/
protected Map.Entry fromEntryResult(EntryResult result)
{
return new EntryResultMapEntry(result);
}
/**
* Convert a {@link Map.Entry} to an {@link EntryResult}.
*
* @param entry the {@link Map.Entry} to convert
*
* @return an {@link EntryResult} that takes its key and value from a {@link Map.Entry}
*/
protected EntryResult toEntryResult(Map.Entry entry)
{
return EntryResult.newBuilder()
.setKey(m_client.toByteString(entry.getKey()))
.setValue(m_client.toByteString(entry.getValue()))
.build();
}
// ----- data members -----------------------------------------------
/**
* A flag indicating whether this advancer has exhausted all of the pages.
*/
protected boolean m_exhausted;
/**
* The opaque cookie used by the server to maintain the page location.
*/
protected ByteString m_cookie;
/**
* The {@link AsyncNamedCacheClient} used to send gRPC requests.
*/
protected final AsyncNamedCacheClient m_client;
}
// ----- inner class: EntryResultMapEntry -------------------------------
/**
* A {@link Map.Entry} implementation that wraps a {@link EntryResult}.
*/
protected static class EntryResultMapEntry
implements Map.Entry
{
// ----- constructors -----------------------------------------------
/**
* Create a {@link EntryResultMapEntry} wrapping a {@link EntryResult}.
*
* @param entryResult the {@link EntryResult} to wrap
*/
protected EntryResultMapEntry(EntryResult entryResult)
{
this.entryResult = entryResult;
}
// ----- Entry interface --------------------------------------------
@Override
public ByteString getKey()
{
return entryResult.getKey();
}
@Override
public ByteString getValue()
{
return entryResult.getValue();
}
@Override
public ByteString setValue(ByteString value)
{
ByteString old = entryResult.getValue();
entryResult = entryResult.toBuilder().setValue(value).build();
return old;
}
// ----- data members -----------------------------------------------
/**
* The {@link EntryResult}.
*/
private EntryResult entryResult;
}
// ----- data members ---------------------------------------------------
/**
* The wrapped {@link AsyncNamedCacheClient}.
*/
protected final AsyncNamedCacheClient f_client;
}