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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.tangosol.net.NamedCache;
import com.tangosol.net.RequestIncompleteException;

import com.tangosol.util.Extractors;
import com.tangosol.util.Filter;
import com.tangosol.util.Filters;
import com.tangosol.util.InvocableMap;
import com.tangosol.util.PagedIterator;

import java.util.Collection;
import java.util.Iterator;
import java.util.Map;

import java.util.concurrent.ExecutionException;

/**
 * A base class for {@link NamedCache} values collection implementations.
 * 

* 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 NamedCache} * and partly to ensure that using this class on a client will not cause all of the data * from the underlying {@link NamedCache} to be pulled back to the caller in one result. * * @param the type of the underlying cache's keys * @param the type of the underlying cache's values * * @author Jonathan Knight 2019.11.12 * @since 20.06 */ public class RemoteValues extends RemoteCollection implements Collection { // ----- constructors --------------------------------------------------- /** * Create a {@link RemoteValues}. * * @param client the {@link AsyncNamedCacheClient} that this key set is linked to */ protected RemoteValues(AsyncNamedCacheClient client) { super(client); } // ----- Set interface -------------------------------------------------- @Override public boolean contains(Object value) { try { return getCache().containsValue(value).get(); } catch (InterruptedException | ExecutionException e) { throw new RequestIncompleteException(e); } } @Override public Iterator iterator() { return new ValuesIterator<>(getCache()); } @Override public boolean remove(Object value) { AsyncNamedCacheClient cache = getCache(); Filter filter = Filters.equal(Extractors.identity(), value); InvocableMap.Entry entry = cache.stream(filter).findFirst().orElse(null); NamedCache x; if (entry == null) { return false; } else { return cache.remove(entry.getKey()) != null; } } @Override public Object[] toArray() { try { return getCache().values(Filters.always()).get().toArray(); } catch (InterruptedException | ExecutionException e) { throw new RequestIncompleteException(e); } } @Override @SuppressWarnings("SuspiciousToArrayCall") public T1[] toArray(T1[] array) { try { return getCache().values(Filters.always()).get().toArray(array); } catch (InterruptedException | ExecutionException e) { throw new RequestIncompleteException(e); } } // ----- inner class: ValuesIterator ------------------------------------ /** * An {@link Iterator} to iterate over the cache values. * * @param the type of the cache keys * @param the type of the cache values */ protected static class ValuesIterator implements Iterator { // ----- constructors ----------------------------------------------- /** * Create a {@link ValuesIterator} to iterate over a cache's values. * * @param client the cache to iterate over */ @SuppressWarnings("unchecked") protected ValuesIterator(AsyncNamedCacheClient client) { this.f_client = client; this.f_iterator = new PagedIterator(new EntryAdvancer(client)); } // ----- Iterator interface ----------------------------------------- @Override public boolean hasNext() { return f_iterator.hasNext(); } @Override public V next() { m_currentEntry = f_iterator.next(); return m_currentEntry.getValue(); } // ----- Iterator methods ------------------------------------------- @Override public void remove() { try { f_client.remove(m_currentEntry.getKey()).get(); } catch (InterruptedException | ExecutionException e) { throw new RequestIncompleteException(e); } } // ----- data members ----------------------------------------------- /** * The underlying cache client. */ protected final AsyncNamedCacheClient f_client; /** * The paged iterator to use to iterate over the cache values * one page at a time. */ protected final Iterator> f_iterator; /** * The current entry in the iterator. */ protected Map.Entry m_currentEntry; } }





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