com.exorath.service.lastserver.dynamodb.LocalDynamoDBCreationRule.java Source code

Introduction

Here is the source code for com.exorath.service.lastserver.dynamodb.LocalDynamoDBCreationRule.java

Source

/*
 * Copyright 2016 Exorath
 *
 * Licensed 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.exorath.service.lastserver.dynamodb;

import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDB;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClient;
import com.amazonaws.services.dynamodbv2.local.main.ServerRunner;
import com.amazonaws.services.dynamodbv2.local.server.DynamoDBProxyServer;
import org.junit.rules.ExternalResource;

import java.io.IOException;
import java.net.ServerSocket;

/**
 * Creates a local DynamoDB instance for testing.
 * See http://stackoverflow.com/a/37780083/1807588
 */
public class LocalDynamoDBCreationRule extends ExternalResource {

    private DynamoDBProxyServer server;
    private AmazonDynamoDB amazonDynamoDB;

    public LocalDynamoDBCreationRule() {
        // This one should be copied during test-compile time. If project's basedir does not contains a folder
        // named 'native-libs' please try '$ mvn clean install' from command line first
        System.setProperty("sqlite4java.library.path", "native-libs");
    }

    @Override
    protected void before() throws Throwable {
        try {
            final String port = getAvailablePort();
            this.server = ServerRunner.createServerFromCommandLineArgs(new String[] { "-inMemory", "-port", port });
            server.start();
            amazonDynamoDB = new AmazonDynamoDBClient(new BasicAWSCredentials("access", "secret"));
            amazonDynamoDB.setEndpoint("http://localhost:" + port);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    protected void after() {
        if (server != null) {
            try {
                server.stop();
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
    }

    public AmazonDynamoDB getAmazonDynamoDB() {
        return amazonDynamoDB;
    }

    private String getAvailablePort() {
        try (final ServerSocket serverSocket = new ServerSocket(0)) {
            return String.valueOf(serverSocket.getLocalPort());
        } catch (IOException e) {
            throw new RuntimeException("Available port was not found", e);
        }
    }
}