com.hazelcast.client.cache.impl.ClientCacheIterator Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2021, Hazelcast, Inc. All Rights Reserved.
*
* 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 com.hazelcast.client.cache.impl;
import com.hazelcast.cache.impl.AbstractCacheIterator;
import com.hazelcast.cache.impl.ICacheInternal;
import com.hazelcast.client.impl.clientside.HazelcastClientInstanceImpl;
import com.hazelcast.client.impl.protocol.ClientMessage;
import com.hazelcast.client.impl.protocol.codec.CacheIterateCodec;
import com.hazelcast.client.impl.protocol.codec.CacheIterateEntriesCodec;
import com.hazelcast.client.impl.spi.ClientContext;
import com.hazelcast.client.impl.spi.impl.ClientInvocation;
import com.hazelcast.client.impl.spi.impl.ClientInvocationFuture;
import com.hazelcast.internal.iteration.IterationPointer;
import com.hazelcast.internal.serialization.Data;
import javax.cache.Cache;
import java.util.Iterator;
import java.util.List;
import static com.hazelcast.internal.iteration.IterationPointer.decodePointers;
import static com.hazelcast.internal.iteration.IterationPointer.encodePointers;
import static com.hazelcast.internal.util.ExceptionUtil.rethrow;
/**
* Client side cluster-wide iterator for {@link com.hazelcast.cache.ICache}.
*
* This implementation is used by client implementation of JCache.
*
* Note: For more information on the iterator details, see {@link AbstractCacheIterator}.
*
* @param the type of key.
* @param the type of value.
*/
public class ClientCacheIterator extends AbstractCacheIterator
implements Iterator> {
private ICacheInternal cacheProxy;
private ClientContext context;
public ClientCacheIterator(ICacheInternal cacheProxy, ClientContext context, boolean prefetchValues) {
this(cacheProxy, context, DEFAULT_FETCH_SIZE, prefetchValues);
}
public ClientCacheIterator(ICacheInternal cacheProxy, ClientContext context,
int fetchSize, boolean prefetchValues) {
super(cacheProxy, context.getPartitionService().getPartitionCount(), fetchSize, prefetchValues);
this.cacheProxy = cacheProxy;
this.context = context;
advance();
}
public ClientCacheIterator(ICacheInternal cacheProxy, ClientContext context, int fetchSize,
int partitionId, boolean prefetchValues) {
super(cacheProxy, context.getPartitionService().getPartitionCount(), fetchSize, prefetchValues);
this.cacheProxy = cacheProxy;
this.context = context;
this.partitionIndex = partitionId;
advance();
}
protected List fetch() {
HazelcastClientInstanceImpl client = (HazelcastClientInstanceImpl) context.getHazelcastInstance();
String name = cacheProxy.getPrefixedName();
if (prefetchValues) {
ClientMessage request = CacheIterateEntriesCodec.encodeRequest(
name, encodePointers(pointers), fetchSize);
try {
ClientInvocation clientInvocation = new ClientInvocation(client, request, name, partitionIndex);
ClientInvocationFuture future = clientInvocation.invoke();
CacheIterateEntriesCodec.ResponseParameters responseParameters = CacheIterateEntriesCodec.decodeResponse(
future.get());
IterationPointer[] pointers = decodePointers(responseParameters.iterationPointers);
setIterationPointers(responseParameters.entries, pointers);
return responseParameters.entries;
} catch (Exception e) {
throw rethrow(e);
}
} else {
ClientMessage request = CacheIterateCodec.encodeRequest(name, encodePointers(pointers), fetchSize);
try {
ClientInvocation clientInvocation = new ClientInvocation(client, request, name, partitionIndex);
ClientInvocationFuture future = clientInvocation.invoke();
CacheIterateCodec.ResponseParameters responseParameters = CacheIterateCodec.decodeResponse(future.get());
IterationPointer[] pointers = decodePointers(responseParameters.iterationPointers);
setIterationPointers(responseParameters.keys, pointers);
return responseParameters.keys;
} catch (Exception e) {
throw rethrow(e);
}
}
}
@Override
protected Data toData(Object obj) {
return context.getSerializationService().toData(obj);
}
@Override
protected T toObject(Object data) {
return context.getSerializationService().toObject(data);
}
}