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BeaconStateTransition.java
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BeaconStateTransition.java
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/*
* Copyright (c) [2016] [ <ether.camp> ]
* This file is part of the ethereumJ library.
*
* The ethereumJ library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The ethereumJ library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the ethereumJ library. If not, see <http://www.gnu.org/licenses/>.
*/
package org.ethereum.sharding.processing.consensus;
import org.ethereum.sharding.domain.Beacon;
import org.ethereum.sharding.processing.state.BeaconState;
import org.ethereum.sharding.processing.state.CrystallizedState;
import org.ethereum.sharding.processing.state.Dynasty;
import org.ethereum.sharding.processing.state.Finality;
import org.ethereum.sharding.registration.ValidatorRepository;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.ethereum.sharding.processing.consensus.BeaconConstants.CYCLE_LENGTH;
import static org.ethereum.sharding.util.BeaconUtils.cycleStartSlot;
/**
* @author Mikhail Kalinin
* @since 12.09.2018
*/
public class BeaconStateTransition implements StateTransition<BeaconState> {
private static final Logger logger = LoggerFactory.getLogger("beacon");
StateTransition<Dynasty> dynastyTransition;
StateTransition<Finality> finalityTransition;
public BeaconStateTransition(ValidatorRepository validatorRepository) {
this.dynastyTransition = new DynastyTransition(new ValidatorSetTransition(validatorRepository));
this.finalityTransition = new FinalityTransition();
}
public BeaconStateTransition(StateTransition<Dynasty> dynastyTransition,
StateTransition<Finality> finalityTransition) {
this.dynastyTransition = dynastyTransition;
this.finalityTransition = finalityTransition;
}
@Override
public BeaconState applyBlock(Beacon block, BeaconState to) {
CrystallizedState crystallized = to.getCrystallizedState();
if (block.getSlotNumber() - crystallized.getLastStateRecalc() >= CYCLE_LENGTH) {
logger.info("Calculate new crystallized state, slot: {}, prev slot: {}",
block.getSlotNumber(), crystallized.getLastStateRecalc());
Finality finality = finalityTransition.applyBlock(block, crystallized.getFinality());
Dynasty dynasty = dynastyTransition.applyBlock(block, crystallized.getDynasty());
crystallized = crystallized
.withDynasty(dynasty)
.withLastStateRecalc(cycleStartSlot(block))
.withFinality(finality);
}
return new BeaconState(crystallized, to.getActiveState());
}
}