docs/_docs/code-snippets/java/src/main/java/org/apache/ignite/snippets/services/EchoServiceAccessInterceptor.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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 org.apache.ignite.examples;

import java.util.concurrent.Callable;
import org.apache.ignite.services.ServiceCallContext;
import org.apache.ignite.services.ServiceCallInterceptor;
import org.apache.ignite.services.ServiceContext;

//tag::service-call-interceptor[]
public class EchoServiceAccessInterceptor implements ServiceCallInterceptor {
    /** {@inheritDoc} */
    @Override public Object invoke(String mtd, Object[] args, ServiceContext ctx, Callable<Object> next) throws Exception {
        ServiceCallContext callCtx = ctx.currentCallContext();

        if (callCtx == null || callCtx.attribute("user") == null)
            throw new SecurityException("Anonymous access is restricted.");

        return next.call();
    }
}
//end::service-call-interceptor[]