RequestProcessor.java

/*
 * Copyright 2010-2011 Ning, Inc.
 *
 * Ning licenses this file to you 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.
 */

package com.ning.billing.payment;

import java.math.BigDecimal;
import java.util.UUID;

import com.google.common.eventbus.Subscribe;
import com.google.inject.Inject;
import com.ning.billing.account.api.Account;
import com.ning.billing.account.api.AccountUserApi;
import com.ning.billing.invoice.api.Invoice;
import com.ning.billing.invoice.api.InvoiceCreationNotification;
import com.ning.billing.invoice.api.InvoicePaymentApi;
import com.ning.billing.payment.api.Either;
import com.ning.billing.payment.api.PaymentAttempt;
import com.ning.billing.payment.api.PaymentError;
import com.ning.billing.payment.api.PaymentInfo;
import com.ning.billing.payment.provider.PaymentProviderPlugin;
import com.ning.billing.payment.provider.PaymentProviderPluginRegistry;
import com.ning.billing.util.eventbus.EventBus;
import com.ning.billing.util.eventbus.EventBus.EventBusException;

public class RequestProcessor {
    public static final String PAYMENT_PROVIDER_KEY = "paymentProvider";
    private final InvoicePaymentApi invoiceApi;
    private final AccountUserApi accountUserApi;
    private final PaymentProviderPluginRegistry pluginRegistry;
    private final EventBus eventBus;

    @Inject
    public RequestProcessor(AccountUserApi accountUserApi,
                            InvoicePaymentApi invoiceApi,
                            PaymentProviderPluginRegistry pluginRegistry,
                            EventBus eventBus) {
        this.invoiceApi = invoiceApi;
        this.accountUserApi = accountUserApi;
        this.pluginRegistry = pluginRegistry;
        this.eventBus = eventBus;
    }

    @Subscribe
    public void receiveInvoice(InvoiceCreationNotification event) {
        try {
            final Invoice invoice = invoiceApi.getInvoice(event.getInvoiceId());
            if (invoice == null) {
                // TODO: log a warning
            }
            else {
                PaymentAttempt paymentAttempt = new PaymentAttempt(UUID.randomUUID(), invoice);

                if (invoice.getAmountOutstanding().compareTo(BigDecimal.ZERO) == 0 ) {
                // TODO: send a notification that invoice was ignored ?
                }
                else {
                    final Account account = accountUserApi.getAccountById(event.getAccountId());

                    if (account == null) {
                        // TODO: log a warning
                    }
                    else {
                        final BigDecimal paymentAmount = invoice.getAmountOutstanding();
                        final String paymentProviderName = account.getPaymentProviderName();
                        final PaymentProviderPlugin plugin = pluginRegistry.getPlugin(paymentProviderName);

                        Either<PaymentError, PaymentInfo> result = plugin.processInvoice(account, invoice);

                        if (result.isLeft()) {
                            invoiceApi.paymentFailed(invoice.getId(),
                                                     paymentAttempt.getPaymentAttemptId(),
                                                     paymentAttempt.getPaymentAttemptDate());
                        }
                        else {
                            updatePaymentAttemptWithPaymentInfoId(result.getRight().getId(), plugin);
                            invoiceApi.paymentSuccessful(invoice.getId(),
                                                         paymentAmount,
                                                         invoice.getCurrency(),
                                                         paymentAttempt.getPaymentAttemptId(),
                                                         paymentAttempt.getPaymentAttemptDate());
                        }
                        eventBus.post(result.isLeft() ? result.getLeft() : result.getRight());
                    }
                }
            }
        }
        catch (EventBusException ex) {
            //  TODO: log
        }
    }

    private void updatePaymentAttemptWithPaymentInfoId(String id, PaymentProviderPlugin plugin) {
        // TODO update PaymentAttempt with paymentId
    }

    @Subscribe
    public void receivePaymentInfoRequest(PaymentInfoRequest paymentInfoRequest) throws EventBusException {
        final Account account = accountUserApi.getAccountById(paymentInfoRequest.getAccountId());
        if (account == null) {
            // TODO: log a warning ?
        }
        else {
            final String paymentProviderName = account.getFieldValue(PAYMENT_PROVIDER_KEY);
            final PaymentProviderPlugin plugin = pluginRegistry.getPlugin(paymentProviderName);

            Either<PaymentError, PaymentInfo> result = plugin.getPaymentInfo(paymentInfoRequest.getPaymentId());

            eventBus.post(result.isLeft() ? result.getLeft() : result.getRight());
        }
    }
}