io.github.bckfnn.reactstreams.arangodb.AsyncHttpClient.java Source code

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Here is the source code for io.github.bckfnn.reactstreams.arangodb.AsyncHttpClient.java

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/*
 * 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 io.github.bckfnn.reactstreams.arangodb;

import io.github.bckfnn.reactstreams.Stream;

import java.io.IOException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.concurrent.FutureCallback;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.entity.ContentType;
import org.apache.http.impl.nio.client.CloseableHttpAsyncClient;
import org.apache.http.impl.nio.client.HttpAsyncClients;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.fasterxml.jackson.databind.ObjectMapper;

public class AsyncHttpClient implements HttpDriver {
    private static Logger LOG = LoggerFactory.getLogger(Client.class);

    private String host;
    private int port;
    private CloseableHttpAsyncClient httpClient;
    private ObjectMapper mapper = new ObjectMapper();

    public AsyncHttpClient() {
        httpClient = HttpAsyncClients.createDefault();
    }

    @Override
    public <T extends Result> Stream<T> process(Operation<T> req) {
        LOG.debug("req -> " + req.getUri());
        return Stream.asOne(subscription -> {
            HttpRequest request = null;
            if (req.getMethod().equals("POST")) {
                HttpPost post = new HttpPost(req.getUri());
                post.setEntity(
                        new ByteArrayEntity(mapper.writeValueAsBytes(req.getBody()), ContentType.APPLICATION_JSON));
                request = post;
            } else if (req.getMethod().equals("GET")) {
                request = new HttpGet(req.getUri());
            }

            httpClient.execute(new HttpHost(host, port), request, new FutureCallback<HttpResponse>() {
                public void completed(HttpResponse result) {
                    LOG.debug("res <- " + result.getStatusLine().getStatusCode());
                    HttpEntity ent = result.getEntity();
                    System.out.println(result.getStatusLine().getStatusCode() + " " + ent.isRepeatable());

                    try {
                        T val = mapper.readValue(ent.getContent(), req.getResponseClass());
                        subscription.sendNext(val);
                        subscription.sendComplete();
                    } catch (Exception e) {
                        subscription.sendError(e);
                    }
                }

                public void failed(Exception ex) {
                    subscription.sendError(ex);
                }

                public void cancelled() {
                    subscription.sendError(new Throwable("cancelled"));
                }
            });
        });
    }

    @Override
    public Stream<Boolean> init(String host, int port) {
        this.host = host;
        this.port = port;
        httpClient.start();
        return Stream.from(true);
    }

    @Override
    public Stream<Void> close() {
        return Stream.asOne(subscription -> {
            try {
                httpClient.close();
                subscription.sendComplete();
            } catch (IOException e) {
                subscription.sendError(e);
            }
        });
    }
}