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/*
* Copyright (c) 2008-2020, 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.impl.protocol.task.map;
import com.hazelcast.client.impl.protocol.ClientMessage;
import com.hazelcast.client.impl.protocol.codec.MapEventJournalReadCodec;
import com.hazelcast.instance.impl.Node;
import com.hazelcast.map.impl.MapService;
import com.hazelcast.map.impl.journal.MapEventJournalReadOperation;
import com.hazelcast.map.EventJournalMapEvent;
import com.hazelcast.internal.nio.Connection;
import com.hazelcast.internal.serialization.Data;
import com.hazelcast.ringbuffer.impl.ReadResultSetImpl;
import com.hazelcast.security.permission.ActionConstants;
import com.hazelcast.security.permission.MapPermission;
import com.hazelcast.spi.impl.operationservice.Operation;
import java.security.Permission;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Function;
import java.util.function.Predicate;
/**
* Reads from the map event journal in batches. You may specify the start
* sequence, the minumum required number of items in the response, the
* maximum number of items in the response, a predicate that the events
* should pass and a projection to apply to the events in the journal.
* If the event journal currently contains less events than the required
* minimum, the call will wait until it has sufficient items.
* The predicate, filter and projection may be {@code null} in which case
* all elements are returned and no projection is applied.
*
* @param the return type of the projection. It is equal to the journal
* event type if the projection is {@code null} or it is the
* identity projection
* @see MapEventJournalReadOperation
* @since 3.9
*/
public class MapEventJournalReadTask
extends AbstractMapPartitionMessageTask {
public MapEventJournalReadTask(ClientMessage clientMessage, Node node, Connection connection) {
super(clientMessage, node, connection);
}
@Override
protected Operation prepareOperation() {
final Function, T> projection = serializationService.toObject(parameters.projection);
final Predicate> predicate = serializationService.toObject(parameters.predicate);
return new MapEventJournalReadOperation(
parameters.name, parameters.startSequence, parameters.minSize,
parameters.maxSize, predicate, projection);
}
@Override
protected MapEventJournalReadCodec.RequestParameters decodeClientMessage(ClientMessage clientMessage) {
return MapEventJournalReadCodec.decodeRequest(clientMessage);
}
@Override
protected ClientMessage encodeResponse(Object response) {
// we are not deserializing the whole content, only the enclosing portable. The actual items remain un
final ReadResultSetImpl resultSet = nodeEngine.getSerializationService().toObject(response);
final List items = new ArrayList(resultSet.size());
final long[] seqs = new long[resultSet.size()];
final Data[] dataItems = resultSet.getDataItems();
for (int k = 0; k < resultSet.size(); k++) {
items.add(dataItems[k]);
seqs[k] = resultSet.getSequence(k);
}
return MapEventJournalReadCodec.encodeResponse(resultSet.readCount(), items, seqs, resultSet.getNextSequenceToReadFrom());
}
@Override
public final String getServiceName() {
return MapService.SERVICE_NAME;
}
public Permission getRequiredPermission() {
return new MapPermission(parameters.name, ActionConstants.ACTION_READ);
}
@Override
public String getDistributedObjectName() {
return parameters.name;
}
@Override
public String getMethodName() {
return "readFromEventJournal";
}
@Override
public Object[] getParameters() {
return new Object[]{
parameters.startSequence, parameters.maxSize, getPartitionId(),
parameters.predicate, parameters.projection, };
}
}