Creating Spring context
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public class InitAPIImpl implements InitAPI {
@Override
public void init(Vertx vertx, Context context, Handler<AsyncResult<Boolean>> handler) {
vertx.executeBlocking(
future -> {
SpringContextUtil.init(vertx, context, ApplicationConfig.class);
future.complete();
},
result -> {
if (result.succeeded()) {
handler.handle(Future.succeededFuture(true));
} else {
handler.handle(Future.failedFuture(result.cause()));
}
});
}
} |
We implemented class SpringContextUtil to use Spring dependency injection in Vert.x applications.
SpringContextUtil#init method initializes Spring context and adds it to Vertx Context object.
...
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public class EholdingsProxyTypesImpl implements EholdingsProxyTypes {
private final Logger logger = LoggerFactory.getLogger(EholdingsProxyTypesImpl.class);
@Autowired
private RMAPIConfigurationService configurationService;
@Autowired
private ProxyConverter converter;
@Autowired
private HeaderValidator headerValidator;
@SuppressWarnings("squid:S1172")
public EholdingsProxyTypesImpl(Vertx vertx, String tenantId) {
SpringContextUtil.autowireDependencies(this, vertxVertx.getOrCreateContextcurrentContext());
} |
SpringContextUtil#autowireDependencies method gets Spring context from Vertx context and uses it to inject beans into EholdingsProxyTypesImpl.
RestVerticle will call constructor with parameters (Vertx vertx, String tenantId) through reflection.@SuppressWarnings("squid:S1172") annotation is needed because Sonar can't see reflection calls and considers tenantId parameter to be unnecessarydefault constructor through reflection.
Declaring Spring configuration
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private RMAPIConfigurationService configurationService;
private PackagesConverter converter;
private HeaderValidator headerValidator;
private PackageParametersValidator packageParametersValidator;
private PackagePutBodyValidator packagePutBodyValidator;
private CustomPackagePutBodyValidator customPackagePutBodyValidator;
private PackagesPostBodyValidator packagesPostBodyValidator;
private TitleParametersValidator titleParametersValidator;
private ResourcesConverter resourceConverter;
private IdParser idParser;
public EholdingsPackagesImpl() {
this(
new RMAPIConfigurationServiceCache(
new RMAPIConfigurationServiceImpl(new ConfigurationClientProvider())),
new HeaderValidator(),
new PackageParametersValidator(),
new PackagePutBodyValidator(),
new CustomPackagePutBodyValidator(),
new PackagesPostBodyValidator(),
new PackagesConverter(),
new TitleParametersValidator(),
new ResourcesConverter(),
new IdParser());
}
// Surpressed warning on number parameters greater than 7 for constructor
@SuppressWarnings("squid:S00107")
public EholdingsPackagesImpl(RMAPIConfigurationService configurationService,
HeaderValidator headerValidator,
PackageParametersValidator packageParametersValidator,
PackagePutBodyValidator packagePutBodyValidator,
CustomPackagePutBodyValidator customPackagePutBodyValidator,
PackagesPostBodyValidator packagesPostBodyValidator,
PackagesConverter converter,
TitleParametersValidator titleParametersValidator,
ResourcesConverter resourceConverter,
IdParser idParser) {
this.configurationService = configurationService;
this.headerValidator = headerValidator;
this.packageParametersValidator = packageParametersValidator;
this.packagesPostBodyValidator = packagesPostBodyValidator;
this.converter = converter;
this.packagePutBodyValidator = packagePutBodyValidator;
this.customPackagePutBodyValidator = customPackagePutBodyValidator;
this.titleParametersValidator = titleParametersValidator;
this.resourceConverter = resourceConverter;
this.idParser = idParser;
} |
With Spring:
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@Autowired
private RMAPIConfigurationService configurationService;
@Autowired
private PackagesConverter converter;
@Autowired
private HeaderValidator headerValidator;
@Autowired
private PackageParametersValidator packageParametersValidator;
@Autowired
private PackagePutBodyValidator packagePutBodyValidator;
@Autowired
private CustomPackagePutBodyValidator customPackagePutBodyValidator;
@Autowired
private PackagesPostBodyValidator packagesPostBodyValidator;
@Autowired
private TitleParametersValidator titleParametersValidator;
@Autowired
private ResourcesConverter resourceConverter;
@Autowired
private IdParser idParser;
@SuppressWarnings("squid:S1172")
public EholdingsPackagesImpl(Vertx vertx, String tenantId) {
SpringContextUtil.autowireDependencies(this, vertxVertx.getOrCreateContextcurrentContext()); } |
4) It resolves circular dependencies between objects.
...
6) Objects are created once instead of being created on each request.
Presentation on dependency injection Spring_DI.pptx