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Code Block
languagejava
themeRDark
titleExample.java
linenumberstrue
collapsetrue
        ServiceCallInterceptor security = new ServiceCallInterceptor() {
            @Override public void onInvoke(ServiceInterceptorContext ctx) throws ServiceInterceptException {
                // Check permission before execution of the method.
                if (!CustomSecurityProvider.get().access(ctx.method(), ctx.attribute("sessionId")))
                    throw new SecurityException("Method invocation is not permitted");
            }
        }

        ServiceCallInterceptor audit = new ServiceCallInterceptor() {
            @Override public void onInvoke(ServiceInterceptorContext ctx) {
                // Record an event before execution of the method.
                AuditProvider.get().recordStartEvent(ctx.method(), ctx.attribute("sessionId"));
            }

            @Override public void onComplete(@Nullable Object res, ServiceInterceptorContext ctx) {
                AuditProvider.get().recordFinishEvent(ctx.method(), ctx.attribute("sessionId"));
            }

            @Override public void onError(Throwable err, ServiceInterceptorContext ctx) {
                AuditProvider.get().recordError(ctx.method(), ctx.attribute("sessionId"), err.getMessage());
            }
        }

        // Set context parameters for service proxy.
        ServiceCallContext ctx = ServiceCallContext.builder().put("sessionId", sessionId).build();

        ServiceConfiguration svcCfg = new ServiceConfiguration()
            .setName("service")
            .setService(new MyServiceImpl())
            .setMaxPerNodeCount(1)
            .setInterceptors(security, audit);

        // Deploy service.
        ignite.services().deploy(svcCfg);

        MyService proxy = ignite.services().serviceProxy("service", MyService.class, false, ctx, 0);

        // A business method call to be intercepted.
        proxy.placeOrder(order1);
        proxy.placeOrder(order2);  

Implementation details

Scope

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Deployment

One service can have several interceptors. They are defined using the service configuration and deployed with the service.

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(question) Interceptor should support LifeCycleAware

Interception scope

Interceptor only applies to user-defined business methods and does not apply to service lifecycle methods - init, execute andcancel,

Service call context

The user can create this context and bind it to the service proxy. After that, each call to the proxy method will also implicitly pass context parameters to the service.

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