49 lines
1.4 KiB
Java
49 lines
1.4 KiB
Java
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package com.baeldung.stm;
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import org.multiverse.api.StmUtils;
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import org.multiverse.api.callables.TxnCallable;
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import org.multiverse.api.references.TxnInteger;
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import org.multiverse.api.references.TxnLong;
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public class Account {
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private final TxnLong lastUpdate;
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private final TxnInteger balance;
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Account(final int balance) {
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this.lastUpdate = StmUtils.newTxnLong(System.currentTimeMillis());
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this.balance = StmUtils.newTxnInteger(balance);
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}
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Integer getBalance() {
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return balance.atomicGet();
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}
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void adjustBy(final int amount) {
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adjustBy(amount, System.currentTimeMillis());
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}
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private void adjustBy(final int amount, final long date) {
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StmUtils.atomic(() -> {
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balance.increment(amount);
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lastUpdate.set(date);
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if (balance.get() < 0) {
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throw new IllegalArgumentException("Not enough money");
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}
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});
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}
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void transferTo(final Account other, final int amount) {
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StmUtils.atomic(() -> {
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final long date = System.currentTimeMillis();
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adjustBy(-amount, date);
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other.adjustBy(amount, date);
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});
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}
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@Override
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public String toString() {
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return StmUtils.atomic((TxnCallable<String>) txn -> "Balance: " + balance.get(txn) + " lastUpdateDate: " + lastUpdate.get(txn));
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}
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}
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