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/*
 * Copyright (c) 2008-2016, 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.core.ExecutionCallback;
import com.hazelcast.map.impl.MapServiceContext;
import com.hazelcast.map.impl.recordstore.RecordStore;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.spi.PartitionAwareOperation;
import com.hazelcast.spi.ReadonlyOperation;

import java.io.IOException;

public class PartitionCheckIfLoadedOperation extends MapOperation implements PartitionAwareOperation, ReadonlyOperation {

    private boolean isFinished;
    private boolean doLoad;
    private boolean waitForKeyLoad;

    public PartitionCheckIfLoadedOperation() {
    }

    public PartitionCheckIfLoadedOperation(String name) {
        this(name, false);
    }

    public PartitionCheckIfLoadedOperation(String name, boolean doLoad) {
        this(name, doLoad, false);
    }

    public PartitionCheckIfLoadedOperation(String name, boolean doLoad, boolean waitForKeyLoad) {
        super(name);
        this.doLoad = doLoad;
        this.waitForKeyLoad = waitForKeyLoad;
    }

    @Override
    public void run() {
        MapServiceContext mapServiceContext = mapService.getMapServiceContext();
        RecordStore recordStore = mapServiceContext.getRecordStore(getPartitionId(), name);

        isFinished = recordStore.isLoaded();

        if (doLoad) {
            recordStore.maybeDoInitialLoad();
        }

        if (waitForKeyLoad) {
            recordStore.onKeyLoad(new CallbackResponseSender());
        }
    }

    @Override
    public Object getResponse() {
        return isFinished;
    }

    @Override
    public boolean returnsResponse() {
        return !waitForKeyLoad;
    }

    @Override
    public void onExecutionFailure(Throwable e) {
        if (!returnsResponse()) {
            // In case of execution failure the CallbackResponseSender will be never invoked
            // and the operation will be never retried. That is the reason why we need to propagate the
            // exception to the caller manually.
            sendResponse(e);
        }
    }

    @Override
    protected void writeInternal(ObjectDataOutput out) throws IOException {
        super.writeInternal(out);
        out.writeBoolean(doLoad);
        out.writeBoolean(waitForKeyLoad);
    }

    @Override
    protected void readInternal(ObjectDataInput in) throws IOException {
        super.readInternal(in);
        doLoad = in.readBoolean();
        waitForKeyLoad = in.readBoolean();
    }

    private class CallbackResponseSender implements ExecutionCallback {
        @Override
        public void onResponse(Boolean response) {
            sendResponse(response);
        }

        @Override
        public void onFailure(Throwable error) {
            sendResponse(error);
        }
    }
}