initial commit

core-banking/src/com/example/banking/domain/Bank.java

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+package com.example.banking.domain;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+
+import com.example.banking.domain.exception.CustomerNotFoundException;
+
+public final class Bank {
+	private final Long id;
+	private String name;
+	private final Map<String, Customer> customers = new HashMap<>();
+
+	// Constructor(id,name)
+	public Bank(Long id, String name) {
+		this.id = id;
+		this.name = name;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	public Long getId() {
+		return id;
+	}
+
+	public Collection<Customer> getCustomers() {
+		return customers.values();
+	}
+
+	public Customer createCustomer(String identity, String fullname) {
+		var customer = new Customer(identity, fullname);
+		customers.put(identity,customer);
+		return customer;
+	}
+
+	public Optional<Customer> getCustomer(String identity) {
+		return Optional.ofNullable(customers.get(identity));
+	}
+
+	public Customer findCustomer(String identity) {
+		return getCustomer(identity).orElseThrow(() -> new CustomerNotFoundException(identity));
+	}
+
+	public Optional<Customer> deleteCustomer(String identity) {
+		return Optional.ofNullable(customers.remove(identity));
+	}
+
+	public double getTotalBalance() {
+		return customers.values()
+				        .stream()
+				        .parallel()
+				        .mapToDouble(Customer::getTotalBalance)
+				        .sum();
+	}
+}

core-banking/src/com/example/banking/domain/exception/CustomerNotFoundException.java

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+package com.example.banking.domain.exception;
+
+@SuppressWarnings("serial")
+public class CustomerNotFoundException extends RuntimeException {
+
+	private final String identity;
+
+	public CustomerNotFoundException(String identity) {
+		this.identity = identity;
+	}
+
+	public String getIdentity() {
+		return identity;
+	}
+
+}