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author
Serdar Hamzaoğulları
committed
Example done with app class
1 parent 9f612ec commit 1474a50

22 files changed

+708
-0
lines changed

‎event-sourcing/pom.xml‎

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<artifactId>junit</artifactId>
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<scope>test</scope>
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</dependency>
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<!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
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<dependency>
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<groupId>com.google.code.gson</groupId>
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<artifactId>gson</artifactId>
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<version>2.8.1</version>
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</dependency>
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</dependencies>
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</project>

‎event-sourcing/src/main/java/com/iluwatar/event/sourcing/api/DomainEvent.java‎

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package com.iluwatar.event.sourcing.api;
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import java.io.Serializable;
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/**
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* Created by serdarh on 06.08.2017.
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*/
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public abstract class DomainEvent implements Serializable {
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private final long sequenceId;
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private final long createdTime;
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private boolean replica = false;
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private final String eventClassName;
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public DomainEvent(long sequenceId, long createdTime, String eventClassName) {
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this.sequenceId = sequenceId;
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this.createdTime = createdTime;
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this.eventClassName = eventClassName;
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}
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public long getSequenceId() {
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return sequenceId;
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}
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public long getCreatedTime() {
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return createdTime;
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}
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public boolean isReplica() {
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return replica;
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}
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public void setReplica(boolean replica) {
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this.replica = replica;
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}
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public abstract void process();
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public String getEventClassName() {
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return eventClassName;
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}
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}

‎event-sourcing/src/main/java/com/iluwatar/event/sourcing/api/EventProcessor.java‎

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package com.iluwatar.event.sourcing.api;
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/**
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* Created by serdarh on 06.08.2017.
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*/
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public interface EventProcessor {
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void process(DomainEvent domainEvent);
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void setPrecessorJournal(ProcessorJournal precessorJournal);
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void addExternalEventListener(ExternalEventListener externalEventListener);
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void recover();
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}

‎event-sourcing/src/main/java/com/iluwatar/event/sourcing/api/ExternalEventListener.java‎

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package com.iluwatar.event.sourcing.api;
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/**
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* Created by serdarh on 06.08.2017.
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*/
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public interface ExternalEventListener {
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void notify(DomainEvent domainEvent);
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}

‎event-sourcing/src/main/java/com/iluwatar/event/sourcing/api/ProcessorJournal.java‎

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package com.iluwatar.event.sourcing.api;
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/**
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* Created by serdarh on 06.08.2017.
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*/
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public interface ProcessorJournal {
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void write(DomainEvent domainEvent);
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void reset();
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DomainEvent readNext();
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}

‎event-sourcing/src/main/java/com/iluwatar/event/sourcing/app/App.java‎

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package com.iluwatar.event.sourcing.app;
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import com.iluwatar.event.sourcing.journal.JsonFileJournal;
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import com.iluwatar.event.sourcing.processor.DomainEventProcessor;
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import com.iluwatar.event.sourcing.service.AccountService;
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import com.iluwatar.event.sourcing.service.MoneyTransactionService;
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import com.iluwatar.event.sourcing.state.AccountAggregate;
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import java.math.BigDecimal;
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/**
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* Created by serdarh on 06.08.2017.
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*/
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public class App {
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public static void main(String[] args) {
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System.out.println("Running the system first time............");
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DomainEventProcessor domainEventProcessor = new DomainEventProcessor();
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JsonFileJournal jsonFileJournal = new JsonFileJournal();
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jsonFileJournal.reset();
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domainEventProcessor.setPrecessorJournal(jsonFileJournal);
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System.out.println("Creating th accounts............");
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AccountService accountService = new AccountService(domainEventProcessor);
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MoneyTransactionService moneyTransactionService = new MoneyTransactionService(domainEventProcessor);
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accountService.createAccount(1,"Daenerys Targaryen");
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accountService.createAccount(2,"Jon Snow");
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System.out.println("Do some money operations............");
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moneyTransactionService.depositMoney(1,new BigDecimal("100000"));
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moneyTransactionService.depositMoney(2,new BigDecimal("10"));
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moneyTransactionService.transferMoney(1,2,new BigDecimal("10000"));
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moneyTransactionService.withdrawalMoney(2, new BigDecimal("1000"));
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System.out.println("...............State:............");
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System.out.println(AccountAggregate.getAccount(1));
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System.out.println(AccountAggregate.getAccount(2));
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System.out.println("At that point system goes down state in memory cleared............");
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AccountAggregate.resetState();
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System.out.println("Recover the syste by the events in journal file............");
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domainEventProcessor = new DomainEventProcessor();
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jsonFileJournal = new JsonFileJournal();
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domainEventProcessor.setPrecessorJournal(jsonFileJournal);
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domainEventProcessor.recover();
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System.out.println("...............State Recovered:............");
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System.out.println(AccountAggregate.getAccount(1));
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System.out.println(AccountAggregate.getAccount(2));
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}
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}

‎event-sourcing/src/main/java/com/iluwatar/event/sourcing/domain/Account.java‎

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package com.iluwatar.event.sourcing.domain;
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import java.math.BigDecimal;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* Created by serdarh on 06.08.2017.
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*/
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public class Account {
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private final int accountNo;
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private final String owner;
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private BigDecimal money;
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private List<Transaction> transactions;
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public Account(int accountNo, String owner) {
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this.accountNo = accountNo;
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this.owner = owner;
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money = BigDecimal.ZERO;
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transactions = new ArrayList<>();
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}
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public int getAccountNo() {
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return accountNo;
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}
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public String getOwner() {
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return owner;
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}
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public BigDecimal getMoney() {
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return money;
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}
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public List<Transaction> getTransactions() {
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return transactions;
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}
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public void setMoney(BigDecimal money) {
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this.money = money;
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}
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public void setTransactions(List<Transaction> transactions) {
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this.transactions = transactions;
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}
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public Account copy() {
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Account account = new Account(accountNo, owner);
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account.setMoney(money);
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account.setTransactions(transactions);
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return account;
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}
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@Override
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public String toString() {
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return "Account{" +
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"accountNo=" + accountNo +
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", owner='" + owner + '\'' +
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", money=" + money +
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", transactions=" + transactions +
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'}';
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}
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}

‎event-sourcing/src/main/java/com/iluwatar/event/sourcing/domain/Transaction.java‎

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package com.iluwatar.event.sourcing.domain;
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import java.math.BigDecimal;
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/**
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* Created by serdarh on 06.08.2017.
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*/
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public class Transaction {
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private final int accountNo;
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private final BigDecimal moneyIn;
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private final BigDecimal moneyOut;
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private final BigDecimal lastBalance;
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public Transaction(int accountNo, BigDecimal moneyIn, BigDecimal moneyOut, BigDecimal lastBalance) {
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this.accountNo = accountNo;
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this.moneyIn = moneyIn;
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this.moneyOut = moneyOut;
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this.lastBalance = lastBalance;
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}
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public int getAccountNo() {
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return accountNo;
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}
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public BigDecimal getMoneyIn() {
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return moneyIn;
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}
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public BigDecimal getMoneyOut() {
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return moneyOut;
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}
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public BigDecimal getLastBalance() {
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return lastBalance;
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}
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@Override
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public String toString() {
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return "Transaction{" +
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"accountNo=" + accountNo +
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", moneyIn=" + moneyIn +
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", moneyOut=" + moneyOut +
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", lastBalance=" + lastBalance +
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'}';
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}
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}

‎event-sourcing/src/main/java/com/iluwatar/event/sourcing/event/AccountCreateEvent.java‎

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package com.iluwatar.event.sourcing.event;
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import com.iluwatar.event.sourcing.api.DomainEvent;
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import com.iluwatar.event.sourcing.domain.Account;
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import com.iluwatar.event.sourcing.gateway.Gateways;
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import com.iluwatar.event.sourcing.state.AccountAggregate;
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/**
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* Created by serdarh on 06.08.2017.
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*/
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public class AccountCreateEvent extends DomainEvent {
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private final int accountNo;
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private final String owner;
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public AccountCreateEvent(long sequenceId, long createdTime, int accountNo, String owner) {
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super(sequenceId, createdTime, "AccountCreateEvent");
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this.accountNo = accountNo;
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this.owner = owner;
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}
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public int getAccountNo() {
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return accountNo;
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}
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public String getOwner() {
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return owner;
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}
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@Override
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public void process() {
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Account account = AccountAggregate.getAccount(accountNo);
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if(account!=null){
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throw new RuntimeException("Account already exists");
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}
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account = new Account(accountNo,owner);
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AccountAggregate.putAccount(account);
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// check if this event is replicated from journal before calling an external gateway function
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if(!isReplica()) {
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Gateways.getAccountCreateContractSender().sendContractInfo(account);
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}
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}
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}

‎event-sourcing/src/main/java/com/iluwatar/event/sourcing/event/MoneyDepositEvent.java‎

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package com.iluwatar.event.sourcing.event;
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import com.iluwatar.event.sourcing.api.DomainEvent;
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import com.iluwatar.event.sourcing.domain.Account;
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import com.iluwatar.event.sourcing.domain.Transaction;
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import com.iluwatar.event.sourcing.gateway.Gateways;
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import com.iluwatar.event.sourcing.state.AccountAggregate;
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import java.math.BigDecimal;
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/**
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* Created by serdarh on 06.08.2017.
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*/
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public class MoneyDepositEvent extends DomainEvent {
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private BigDecimal money;
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private int accountNo;
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public MoneyDepositEvent(long sequenceId, long createdTime, int accountNo,BigDecimal money) {
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super(sequenceId, createdTime, "MoneyDepositEvent");
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this.money = money;
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this.accountNo = accountNo;
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}
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@Override
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public void process() {
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Account account = AccountAggregate.getAccount(accountNo);
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if(account==null){
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throw new RuntimeException("Account not found");
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}
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account.setMoney(account.getMoney().add(money));
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Transaction transaction = new Transaction(accountNo,money,BigDecimal.ZERO,account.getMoney());
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account.getTransactions().add(transaction);
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AccountAggregate.putAccount(account);
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if(!isReplica()) {
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Gateways.getTransactionLogger().log(transaction);
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}
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}
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}

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