Java tutorial
/* * Copyright 2013 Y12STUDIO * * 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 org.blackbananacoin.ext.curconvert.testlog; import java.math.BigDecimal; import java.util.HashMap; import java.util.Map; import java.util.concurrent.Callable; import java.util.concurrent.Executors; import com.google.api.client.http.GenericUrl; import com.google.api.client.http.HttpRequest; import com.google.api.client.http.HttpRequestFactory; import com.google.api.client.http.HttpRequestInitializer; import com.google.api.client.http.HttpTransport; import com.google.api.client.http.javanet.NetHttpTransport; import com.google.api.client.json.GenericJson; import com.google.api.client.json.JsonFactory; import com.google.api.client.json.JsonObjectParser; import com.google.api.client.json.gson.GsonFactory; import com.google.common.util.concurrent.AsyncFunction; import com.google.common.util.concurrent.FutureCallback; import com.google.common.util.concurrent.Futures; import com.google.common.util.concurrent.ListenableFuture; import com.google.common.util.concurrent.ListeningExecutorService; import com.google.common.util.concurrent.MoreExecutors; public class CurFutureMixChain { private ListeningExecutorService pool = MoreExecutors.listeningDecorator(Executors.newFixedThreadPool(2)); public static final String YAHOO_CUR_TAG = "TWD"; public static final HttpTransport HTTP_TRANSPORT = new NetHttpTransport(); public static final JsonFactory JSON_FACTORY = new GsonFactory(); public static String EXURL_BLOCKCHAIN = "https://blockchain.info/ticker"; public static String EXURL_YAHOO_USDTWD = "http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20csv%20where%20url%3D%22http%3A%2F%2Ffinance.yahoo.com%2Fd%2Fquotes.csv%3Fe%3D.csv%26f%3Dc4l1%26s%3DUSD" + YAHOO_CUR_TAG + "%3DX%22%3B&format=json&diagnostics=true&callback="; public static void main(String[] args) throws Exception { new CurFutureMixChain().run(); } public void run() throws Exception { HttpRequestFactory requestFactory = HTTP_TRANSPORT.createRequestFactory(new HttpRequestInitializer() { public void initialize(HttpRequest request) { request.setParser(new JsonObjectParser(JSON_FACTORY)); } }); final GenericUrl urlBlockchain = new GenericUrl(EXURL_BLOCKCHAIN); final GenericUrl urlYahooTwd = new GenericUrl(EXURL_YAHOO_USDTWD); final HttpRequest requestBlockChain = requestFactory.buildGetRequest(urlBlockchain); final HttpRequest requestYahoo = requestFactory.buildGetRequest(urlYahooTwd); final ListenableFuture<Double> futureYahoo = pool.submit(new Callable<Double>() { public Double call() throws Exception { GenericJson jsonYahoo = requestYahoo.execute().parseAs(GenericJson.class); System.out.println(jsonYahoo); Map query = (Map) jsonYahoo.get("query"); Map results = (Map) query.get("results"); Map row = (Map) results.get("row"); double twd = Double.parseDouble((String) row.get("col1")); System.out.println("======== GET TWD/USD Rate ========="); System.out.println(twd); return twd; } }); final AsyncFunction<Double, GenericJson> relevanceAsyncFun = new AsyncFunction<Double, GenericJson>() { public ListenableFuture<GenericJson> apply(final Double twdPerUsd) throws Exception { final ListenableFuture<GenericJson> futureReqBlockChain = pool.submit(new Callable<GenericJson>() { public GenericJson call() throws Exception { GenericJson json = requestBlockChain.execute().parseAs(GenericJson.class); handleTwdAppend(twdPerUsd, json); return json; } private void handleTwdAppend(final Double twdPerUsd, GenericJson json) { System.out.println(json); Map usdJson = (Map) json.get("USD"); Map ntdJson = new HashMap<String, Object>(); BigDecimal usdBuy = (BigDecimal) usdJson.get("buy"); BigDecimal usdLast = (BigDecimal) usdJson.get("last"); BigDecimal usd15m = (BigDecimal) usdJson.get("15m"); BigDecimal usdSell = (BigDecimal) usdJson.get("sell"); BigDecimal twdBuy = usdBuy.multiply(BigDecimal.valueOf(twdPerUsd)); BigDecimal twdSell = usdSell.multiply(BigDecimal.valueOf(twdPerUsd)); BigDecimal twd15m = usd15m.multiply(BigDecimal.valueOf(twdPerUsd)); BigDecimal twdLast = usdLast.multiply(BigDecimal.valueOf(twdPerUsd)); ntdJson.put("buy", twdBuy); ntdJson.put("sell", twdSell); ntdJson.put("last", twdLast); ntdJson.put("15m", twd15m); ntdJson.put("symbol", "NT$"); json.put(YAHOO_CUR_TAG, ntdJson); // System.out.println(json); } }); return futureReqBlockChain; } }; ListenableFuture<GenericJson> futureMix = Futures.transform(futureYahoo, relevanceAsyncFun); Futures.addCallback(futureMix, new FutureCallback<GenericJson>() { public void onSuccess(GenericJson result) { System.out.println("======== RESULT ========="); System.out.println(result); pool.shutdown(); } public void onFailure(Throwable t) { t.printStackTrace(); pool.shutdown(); } }); } }