/*
 *
 * 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.airavata.common.context;

/**
 * The workflow context class. This will be local to a thread. Workflow data that needs to propagate relevant to a
 * request will be stored here. We use thread local globals to store request data. Currently we only store user
 * identity.
 */
public class WorkflowContext {

    private static final ThreadLocal userThreadLocal = new InheritableThreadLocal();

    /**
     * Sets the context.
     * 
     * @param context
     *            The context to be set. - Careful when calling this. Make sure other data relevant to context is
     *            preserved.
     */
    public static void set(RequestContext context) {
        userThreadLocal.set(context);
    }

    /**
     * Clears the context
     */
    public static void unset() {
        userThreadLocal.remove();
    }

    /**
     * Gets the context associated with current context.
     * 
     * @return The context associated with current thread.
     */
    public static RequestContext get() {
        return (RequestContext) userThreadLocal.get();
    }

    /**
     * Gets the user associated with current user.
     * 
     * @return User id associated with current request.
     */
    public static synchronized String getRequestUser() {

        RequestContext requestContext = (RequestContext) userThreadLocal.get();

        if (requestContext != null) {
            return requestContext.getUserIdentity();
        }

        return null;
    }

    public static synchronized String getGatewayId() {

        RequestContext requestContext = (RequestContext) userThreadLocal.get();

        if (requestContext != null) {
            return requestContext.getGatewayId();
        }

        return null;
    }
}