/*
 * Copyright (c) 2008-2017, 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.map.impl.operation;

import com.hazelcast.internal.nearcache.impl.invalidation.Invalidator;
import com.hazelcast.map.impl.MapContainer;
import com.hazelcast.map.impl.MapDataSerializerHook;
import com.hazelcast.map.impl.MapService;
import com.hazelcast.map.impl.MapServiceContext;
import com.hazelcast.map.impl.PartitionContainer;
import com.hazelcast.map.impl.event.MapEventPublisher;
import com.hazelcast.map.impl.mapstore.MapDataStore;
import com.hazelcast.map.impl.nearcache.MapNearCacheManager;
import com.hazelcast.map.impl.recordstore.RecordStore;
import com.hazelcast.nio.serialization.Data;
import com.hazelcast.nio.serialization.IdentifiedDataSerializable;
import com.hazelcast.spi.impl.AbstractNamedOperation;

import java.util.List;

import static com.hazelcast.util.CollectionUtil.isEmpty;

public abstract class MapOperation extends AbstractNamedOperation implements IdentifiedDataSerializable {

    protected transient MapService mapService;
    protected transient MapContainer mapContainer;
    protected transient MapServiceContext mapServiceContext;
    protected transient MapEventPublisher mapEventPublisher;
    protected transient RecordStore recordStore;

    protected transient boolean createRecordStoreOnDemand = true;

    public MapOperation() {
    }

    public MapOperation(String name) {
        this.name = name;
    }

    // for testing only
    public void setMapService(MapService mapService) {
        this.mapService = mapService;
    }

    // for testing only
    public void setMapContainer(MapContainer mapContainer) {
        this.mapContainer = mapContainer;
    }

    @Override
    public void beforeRun() throws Exception {
        super.beforeRun();

        mapService = getService();
        mapServiceContext = mapService.getMapServiceContext();
        mapEventPublisher = mapServiceContext.getMapEventPublisher();

        innerBeforeRun();
    }

    public void innerBeforeRun() throws Exception {
        recordStore = getRecordStoreOrNull();
        if (recordStore == null) {
            mapContainer = mapServiceContext.getMapContainer(name);
        } else {
            mapContainer = recordStore.getMapContainer();
        }
    }

    @Override
    public String getServiceName() {
        return MapService.SERVICE_NAME;
    }

    public boolean isPostProcessing(RecordStore recordStore) {
        MapDataStore mapDataStore = recordStore.getMapDataStore();
        return mapDataStore.isPostProcessingMapStore() || mapServiceContext.hasInterceptor(name);
    }

    public void setThreadId(long threadId) {
        throw new UnsupportedOperationException();
    }

    public long getThreadId() {
        throw new UnsupportedOperationException();
    }

    protected final void invalidateNearCache(List<Data> keys) {
        if (!mapContainer.hasInvalidationListener() || isEmpty(keys)) {
            return;
        }

        Invalidator invalidator = getNearCacheInvalidator();

        for (Data key : keys) {
            invalidator.invalidateKey(key, name, getCallerUuid());
        }
    }

    // TODO: improve here it's possible that client cannot manage to attach listener
    public final void invalidateNearCache(Data key) {
        if (!mapContainer.hasInvalidationListener() || key == null) {
            return;
        }

        Invalidator invalidator = getNearCacheInvalidator();
        invalidator.invalidateKey(key, name, getCallerUuid());
    }

    /**
     * This method helps to add clearing Near Cache event only from one-partition which matches partitionId of the map name.
     */
    protected final void invalidateAllKeysInNearCaches() {
        if (!mapContainer.hasInvalidationListener()
                || getPartitionId() != getNodeEngine().getPartitionService().getPartitionId(name)) {
            return;
        }

        Invalidator invalidator = getNearCacheInvalidator();
        invalidator.invalidateAllKeys(name, getCallerUuid());
    }

    private Invalidator getNearCacheInvalidator() {
        MapNearCacheManager mapNearCacheManager = mapServiceContext.getMapNearCacheManager();
        return mapNearCacheManager.getInvalidator();
    }

    protected void evict(Data excludedKey) {
        assert recordStore != null : "Record-store cannot be null";

        recordStore.evictEntries(excludedKey);
    }

    private RecordStore getRecordStoreOrNull() {
        int partitionId = getPartitionId();
        if (partitionId == -1) {
            return null;
        }
        PartitionContainer partitionContainer = mapServiceContext.getPartitionContainer(partitionId);
        if (createRecordStoreOnDemand) {
            return partitionContainer.getRecordStore(name);
        } else {
            return partitionContainer.getExistingRecordStore(name);
        }
    }

    @Override
    public int getFactoryId() {
        return MapDataSerializerHook.F_ID;
    }
}