core/src/main/java/org/apache/oozie/servlet/V0AdminServlet.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.oozie.servlet;

import java.io.IOException;
import java.util.Arrays;
import java.util.Collections;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.oozie.ErrorCode;
import org.apache.oozie.client.OozieClient.SYSTEM_MODE;
import org.apache.oozie.client.rest.JsonBean;
import org.apache.oozie.client.rest.JsonTags;
import org.apache.oozie.client.rest.RestConstants;
import org.apache.oozie.service.Services;
import org.json.simple.JSONObject;

@SuppressWarnings("unchecked")
public class V0AdminServlet extends BaseAdminServlet {
    private static final long serialVersionUID = 1L;
    private static final String INSTRUMENTATION_NAME = "v0admin";
    private static final ResourceInfo RESOURCES_INFO[] = new ResourceInfo[6];

    static {
        RESOURCES_INFO[0] = new ResourceInfo(RestConstants.ADMIN_STATUS_RESOURCE, Arrays.asList("PUT", "GET"),
                                             Arrays.asList(new ParameterInfo(RestConstants.ADMIN_SAFE_MODE_PARAM, Boolean.class,
                                                     true,
                                                                             Arrays.asList("PUT"))));
        RESOURCES_INFO[1] = new ResourceInfo(RestConstants.ADMIN_OS_ENV_RESOURCE, Arrays.asList("GET"),
                Collections.EMPTY_LIST);
        RESOURCES_INFO[2] = new ResourceInfo(RestConstants.ADMIN_JAVA_SYS_PROPS_RESOURCE, Arrays.asList("GET"),
                Collections.EMPTY_LIST);
        RESOURCES_INFO[3] = new ResourceInfo(RestConstants.ADMIN_CONFIG_RESOURCE, Arrays.asList("GET"),
                Collections.EMPTY_LIST);
        RESOURCES_INFO[4] = new ResourceInfo(RestConstants.ADMIN_INSTRUMENTATION_RESOURCE, Arrays.asList("GET"),
                Collections.EMPTY_LIST);
        RESOURCES_INFO[5] = new ResourceInfo(RestConstants.ADMIN_BUILD_VERSION_RESOURCE, Arrays.asList("GET"),
                Collections.EMPTY_LIST);
    }

    public V0AdminServlet() {
        super(INSTRUMENTATION_NAME, RESOURCES_INFO);
        modeTag = RestConstants.ADMIN_SAFE_MODE_PARAM;
    }

    @Override
    protected void populateOozieMode(JSONObject json) {
        if (Services.get().getSystemMode() != SYSTEM_MODE.NORMAL) {
            json.put(JsonTags.OOZIE_SAFE_MODE, true);
        }
        else {
            json.put(JsonTags.OOZIE_SAFE_MODE, false);
        }
    }

    @Override
    protected void setOozieMode(HttpServletRequest request, HttpServletResponse response, String resourceName)
            throws XServletException {
        boolean safeMode = Boolean.parseBoolean(request.getParameter(modeTag));
        SYSTEM_MODE sysMode = safeMode ? SYSTEM_MODE.NOWEBSERVICE : SYSTEM_MODE.NORMAL;
        Services.get().setSystemMode(sysMode);
        response.setStatus(HttpServletResponse.SC_OK);
    }

    @Override
    protected void getQueueDump(JSONObject json) throws XServletException {
        throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0301, "cannot get queue dump");
    }

    @Override
    protected JsonBean getJMSConnectionInfo(HttpServletRequest request, HttpServletResponse response) throws XServletException,
            IOException {
        throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0302, "Not supported in v0");
    }

    @Override
    protected Map<String, String> getOozieURLs() throws XServletException {
        throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0302, "Not supported in v0");
    }

    @Override
    protected void sendMetricsResponse(HttpServletResponse response) throws IOException, XServletException {
        throw new XServletException(HttpServletResponse.SC_BAD_REQUEST, ErrorCode.E0302, "Not supported in v0");
    }
}