com.baifendian.swordfish.common.hadoop.YarnRestClient.java Source code

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Here is the source code for com.baifendian.swordfish.common.hadoop.YarnRestClient.java

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/*
 * Copyright (C) 2017 Baifendian Corporation
 *
 * Licensed 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 com.baifendian.swordfish.common.hadoop;

import com.baifendian.swordfish.dao.enums.FlowStatus;
import java.io.IOException;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang3.tuple.Pair;
import org.apache.http.HttpEntity;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpResponseException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.json.JSONException;
import org.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class YarnRestClient {

    private static final Logger logger = LoggerFactory.getLogger(YarnRestClient.class);

    private static YarnRestClient instance;

    private YarnRestClient() throws HdfsException {
    }

    /**
     *  yarn rest client 
     *
     * @return
     */
    public static YarnRestClient getInstance() {
        if (instance == null) {
            synchronized (YarnRestClient.class) {
                if (instance == null) {
                    instance = new YarnRestClient();
                }
            }
        }

        return instance;
    }

    /**
     * ??
     *
     * @param appId
     * @return ? null, ??
     * @throws JSONException
     * @throws IOException
     */
    public FlowStatus getApplicationStatus(String appId) throws JSONException, IOException {
        if (StringUtils.isEmpty(appId)) {
            return null;
        }

        String url = ConfigurationUtil.getApplicationStatusAddress(appId);

        CloseableHttpClient httpclient = HttpClients.createDefault();
        HttpGet httpget = new HttpGet(url);

        ResponseHandler<Pair<Integer, String>> rh = response -> {
            StatusLine statusLine = response.getStatusLine();
            HttpEntity entity = response.getEntity();
            if (statusLine.getStatusCode() >= 300) {
                if (statusLine.getStatusCode() == 404 || statusLine.getStatusCode() == 330) {
                    return null;
                }

                throw new HttpResponseException(statusLine.getStatusCode(), statusLine.getReasonPhrase());
            }

            if (entity == null) {
                throw new ClientProtocolException("Response contains no content");
            }

            String content = EntityUtils.toString(entity);

            JSONObject o = null;
            try {
                o = new JSONObject(content);
            } catch (JSONException e) {
                throw new HttpResponseException(statusLine.getStatusCode(), content);
            }

            if (!o.has("app") || o.isNull("app")) {
                throw new RuntimeException("Response content not valid " + content);
            }

            try {
                return Pair.of(statusLine.getStatusCode(), o.getJSONObject("app").getString("finalStatus"));
            } catch (JSONException e) {
                throw new HttpResponseException(statusLine.getStatusCode(), content);
            }
        };

        Pair<Integer, String> pair = httpclient.execute(httpget, rh);

        if (pair == null) {
            return null;
        }

        switch (pair.getRight()) {
        case "FAILED":
            return FlowStatus.FAILED;
        case "KILLED":
            return FlowStatus.KILL;
        case "SUCCEEDED":
            return FlowStatus.SUCCESS;
        case "NEW":
        case "NEW_SAVING":
        case "SUBMITTED":
        case "ACCEPTED":
            return FlowStatus.INIT;
        case "RUNNING":
        default:
            return FlowStatus.RUNNING;
        }
    }

    public static void main(String[] args) throws Exception {
        System.out.println(
                "Status is:" + YarnRestClient.getInstance().getApplicationStatus("application_1494488429167_0050"));
        System.out.println("Status is:"
                + YarnRestClient.getInstance().getApplicationStatus("application_1493947416024_014222"));
        System.out.println(
                "Status is:" + YarnRestClient.getInstance().getApplicationStatus("application_1494488429167_0047"));
    }
}