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Bucket4j core library
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/*-
 * ========================LICENSE_START=================================
 * Bucket4j
 * %%
 * Copyright (C) 2015 - 2020 Vladimir Bukhtoyarov
 * %%
 * 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.
 * =========================LICENSE_END==================================
 */

package io.github.bucket4j.grid;

import io.github.bucket4j.serialization.DeserializationAdapter;
import io.github.bucket4j.serialization.SerializationAdapter;
import io.github.bucket4j.serialization.SerializationHandle;

import java.io.IOException;

public class ReserveAndCalculateTimeToSleepCommand implements GridCommand {

    private static final long serialVersionUID = 1L;

    private long tokensToConsume;
    private long waitIfBusyNanosLimit;
    private boolean bucketStateModified;

    public static final SerializationHandle SERIALIZATION_HANDLE = new SerializationHandle() {
        @Override
        public  ReserveAndCalculateTimeToSleepCommand deserialize(DeserializationAdapter adapter, S input) throws IOException {
            long tokensToConsume = adapter.readLong(input);
            long waitIfBusyNanosLimit = adapter.readLong(input);

            return new ReserveAndCalculateTimeToSleepCommand(tokensToConsume, waitIfBusyNanosLimit);
        }

        @Override
        public  void serialize(SerializationAdapter adapter, O output, ReserveAndCalculateTimeToSleepCommand command) throws IOException {
            adapter.writeLong(output, command.tokensToConsume);
            adapter.writeLong(output, command.waitIfBusyNanosLimit);
        }

        @Override
        public int getTypeId() {
            return 5;
        }

        @Override
        public Class getSerializedType() {
            return ReserveAndCalculateTimeToSleepCommand.class;
        }

    };

    public ReserveAndCalculateTimeToSleepCommand(long tokensToConsume, long waitIfBusyNanosLimit) {
        this.tokensToConsume = tokensToConsume;
        this.waitIfBusyNanosLimit = waitIfBusyNanosLimit;
    }

    @Override
    public Long execute(GridBucketState state, long currentTimeNanos) {
        state.refillAllBandwidth(currentTimeNanos);

        long nanosToCloseDeficit = state.calculateDelayNanosAfterWillBePossibleToConsume(tokensToConsume, currentTimeNanos);
        if (nanosToCloseDeficit == Long.MAX_VALUE || nanosToCloseDeficit > waitIfBusyNanosLimit) {
            return Long.MAX_VALUE;
        } else {
            state.consume(tokensToConsume);
            bucketStateModified = true;
            return nanosToCloseDeficit;
        }
    }

    @Override
    public boolean isBucketStateModified() {
        return bucketStateModified;
    }

    public static long getSerialVersionUID() {
        return serialVersionUID;
    }

    public long getTokensToConsume() {
        return tokensToConsume;
    }

    public long getWaitIfBusyNanosLimit() {
        return waitIfBusyNanosLimit;
    }
}