Revision: 20205
http://sourceforge.net/p/gate/code/20205
Author: domrout
Date: 2017-04-05 08:25:42 +0000 (Wed, 05 Apr 2017)
Log Message:
-----------
Actually commit the new version of WebUtils
Added Paths:
-----------
mimir/trunk/mimir-client/src/gate/mimir/tool/WebUtils.java
Added: mimir/trunk/mimir-client/src/gate/mimir/tool/WebUtils.java
===================================================================
--- mimir/trunk/mimir-client/src/gate/mimir/tool/WebUtils.java
(rev 0)
+++ mimir/trunk/mimir-client/src/gate/mimir/tool/WebUtils.java 2017-04-05
08:25:42 UTC (rev 20205)
@@ -0,0 +1,507 @@
+/*
+ * WebUtils.java
+ *
+ * Copyright (c) 2007-2011, The University of Sheffield.
+ *
+ * This file is part of GATE MÃmir (see http://gate.ac.uk/family/mimir.html),
+ * and is free software, licenced under the GNU Lesser General Public License,
+ * Version 3, June 2007 (also included with this distribution as file
+ * LICENCE-LGPL3.html).
+ *
+ * Dominic Rout 5 Apr 2017
+ * Valentin Tablan, 29 Jan 2010
+ *
+ * $Id: WebUtils.java 17423 2014-02-26 10:36:54Z valyt $
+ */
+package gate.mimir.tool;
+
+import org.apache.http.auth.AuthScope;
+import org.apache.http.auth.UsernamePasswordCredentials;
+import org.apache.http.client.CookieStore;
+import org.apache.http.client.CredentialsProvider;
+import org.apache.http.client.config.CookieSpecs;
+import org.apache.http.client.config.RequestConfig;
+import org.apache.http.client.methods.CloseableHttpResponse;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.client.methods.HttpPost;
+import org.apache.http.client.methods.HttpUriRequest;
+import org.apache.http.client.protocol.HttpClientContext;
+import org.apache.http.client.utils.URIBuilder;
+import org.apache.http.entity.ByteArrayEntity;
+import org.apache.http.entity.SerializableEntity;
+import org.apache.http.impl.client.BasicCredentialsProvider;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClients;
+import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
+import org.apache.http.protocol.HttpContext;
+import sun.net.www.protocol.http.HttpURLConnection;
+
+import java.io.*;
+import java.net.URISyntaxException;
+import java.nio.CharBuffer;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * A collection of methods that provide various utility functions for web
+ * applications.
+ */
+public class WebUtils {
+
+ protected PoolingHttpClientConnectionManager connectionManager;
+ protected CredentialsProvider credsProvider;
+ protected CloseableHttpClient client;
+ protected boolean hasContext;
+ protected CookieStore cookieJar;
+ protected UsernamePasswordCredentials creds;
+
+
+ public WebUtils() {
+ this(null, null, null, 10);
+ }
+
+ public WebUtils(CookieStore cookieJar) {
+ this(null, null, null, 10);
+ }
+
+ public WebUtils(String userName, String password) {
+ this(null, userName, password, 10);
+ }
+
+ public WebUtils(CookieStore cookieJar,
+ String userName, String password) {
+ this(cookieJar, userName, password, 10);
+
+ }
+
+ public WebUtils(CookieStore cookieJar,
+ String userName, String password, int maxConnections) {
+ connectionManager = new PoolingHttpClientConnectionManager(30,
TimeUnit.SECONDS);
+ // Increase max total connection to 200
+ connectionManager.setMaxTotal(maxConnections);
+ // Increase default max connection per route to 20
+ connectionManager.setDefaultMaxPerRoute(maxConnections);
+
+ this.cookieJar = cookieJar;
+
+
+ hasContext = cookieJar != null || userName != null || password != null;
+
+ credsProvider = new BasicCredentialsProvider();
+ if (userName != null && password != null) {
+ creds = new UsernamePasswordCredentials(userName, password);
+ } else {
+ creds = null;
+ }
+
+ RequestConfig globalConfig = RequestConfig.custom()
+ .setCookieSpec(CookieSpecs.DEFAULT)
+ .build();
+
+ client = HttpClients.custom()
+ .setConnectionManager(connectionManager)
+ .setDefaultRequestConfig(globalConfig)
+ .setDefaultCookieStore(cookieJar)
+ .build();
+ }
+
+ /**
+ * Constructs a URL from a base URL segment and a set of query parameters.
+ * @param urlBase the string that will be the prefix of the returned.
+ * This should include everything apart from the query part of the URL.
+ * @param params an array of String values, which should contain
alternating
+ * parameter names and parameter values. It is obvious that the size of
this
+ * array must be an even number.
+ * @return a URl built according to the provided parameters. If for example
+ * the following parameter values are provided: <b>urlBase:</b>
+ * <tt>http://host:8080/appName/service</tt>; <b>params:</b> <tt>foo1,
bar1,
+ * foo2, bar2, foo3, bar3</tt>, then the following URL would be returned:
+ *
<tt>http://host:8080/appName/service?foo1=bar1&foo2=bar2&foo3=bar3</tt>
+ */
+ public static String buildUrl(String urlBase, String... params){
+ StringBuilder str = new StringBuilder(urlBase);
+ if(params != null && params.length > 0){
+ str.append('?');
+ for(int i = 0 ; i < (params.length/2) - 1; i++){
+ str.append(params[i * 2]);
+ str.append('=');
+ str.append(params[i * 2 + 1]);
+ str.append('&');
+ }
+ //and now, the last parameter
+ str.append(params[params.length - 2]);
+ str.append('=');
+ str.append(params[params.length - 1]);
+ }
+ return str.toString();
+ }
+
+
+ protected HttpContext getContext() {
+ HttpClientContext context = HttpClientContext.create();
+ context.setCredentialsProvider(credsProvider);
+ if (this.cookieJar != null) {
+ context.setCookieStore(this.cookieJar);
+ }
+
+ return context;
+ }
+
+ public CloseableHttpResponse execute(HttpUriRequest request) throws
IOException {
+ // If we have a context, we have to generate a new one for each
request,
+ // because sharing them between threads seems to break after a few
hundred thousan
+ // requests.
+ if (hasContext) {
+ // Fetch a context to use.
+ HttpContext context = getContext();
+
+ if (creds != null) {
+ // Attach any credentials provided to the given host.
+ credsProvider.setCredentials(
+ new AuthScope(request.getURI().getHost(),
+ AuthScope.ANY_PORT),
+ creds);
+ }
+
+ // Run the request.
+ return this.client.execute(request, context);
+ } else {
+ // No cookies or auth needed - just run the request as is.
+ return this.client.execute(request);
+ }
+ }
+
+ /**
+ * Calls a web service action (i.e. it connects to a URL). If the
connection
+ * fails, for whatever reason, or the response code is different from
+ * {@link HttpURLConnection#HTTP_OK}, then an IOException is raised.
+ * This method will write all content available from the
+ * input stream of the resulting connection to the provided Appendable.
+ *
+ * @param out an {@link Appendable} to which the output is written.
+ * @param baseUrl the constant part of the URL to be accessed.
+ * @param params an array of String values, that contain an alternation of
+ * parameter name, and parameter values.
+ * @throws IOException if the connection fails.
+ */
+ public void getText(final Appendable out, String baseUrl, String... params)
+ throws IOException {
+ HttpGet request = new HttpGet(buildUrl(baseUrl, params));
+
+ new RequestExecutor<Void>(this)
+ .runRequest(request, response -> {
+ InputStream contentInputStream =
response.getEntity().getContent();
+ try {
+ Reader r = new InputStreamReader(contentInputStream,
"UTF-8");
+ char[] bufArray = new char[4096];
+ CharBuffer buf = CharBuffer.wrap(bufArray);
+ int charsRead = -1;
+ while ((charsRead = r.read(bufArray)) >= 0) {
+ buf.position(0);
+ buf.limit(charsRead);
+ out.append(buf);
+
+ }
+ } finally {
+ contentInputStream.close();
+ }
+ return null;
+ });
+ }
+
+ /**
+ * Calls a web service action (i.e. it connects to a URL), and reads a
+ * serialised int value from the resulting connection. If the connection
+ * fails, for whatever reason, or the response code is different from
+ * {@link HttpURLConnection#HTTP_OK}, then an IOException is raised.
+ * This method will drain (and discard) all additional content available
from
+ * either the input and error streams of the resulting connection (which
+ * should permit connection keepalives).
+ *
+ * @param baseUrl the constant part of the URL to be accessed.
+ * @param params an array of String values, that contain an alternation of
+ * parameter name, and parameter values.
+ * @throws IOException if the connection fails.
+ */
+ public int getInt(String baseUrl, String... params)
+ throws IOException {
+ HttpGet request = new HttpGet(buildUrl(baseUrl, params));
+
+ return new RequestExecutor<Integer>(this)
+ .runObjectRequest(request, (ObjectInputStream o) ->
o.readInt());
+ }
+
+ /**
+ * Calls a web service action (i.e. it connects to a URL). If the
connection
+ * fails, for whatever reason, or the response code is different from
+ * {@link HttpURLConnection#HTTP_OK}, then an IOException is raised.
+ * This method will drain (and discard) all content available from either
the
+ * input and error streams of the resulting connection (which should permit
+ * connection keepalives).
+ *
+ * @param baseUrl the constant part of the URL to be accessed.
+ * @param params an array of String values, that contain an alternation of
+ * parameter name, and parameter values.
+ * @throws IOException if the connection fails.
+ */
+ public void getVoid(String baseUrl, String... params) throws IOException {
+ HttpGet request = new HttpGet(buildUrl(baseUrl, params));
+
+ new RequestExecutor<Void>(this)
+ .runRequest(request, response -> null);
+ }
+
+ /**
+ * Calls a web service action (i.e. it connects to a URL), and reads a
+ * serialised long value from the resulting connection. If the connection
+ * fails, for whatever reason, or the response code is different from
+ * {@link HttpURLConnection#HTTP_OK}, then an IOException is raised.
+ * This method will drain (and discard) all additional content available
from
+ * either the input and error streams of the resulting connection (which
+ * should permit connection keepalives).
+ *
+ * @param baseUrl the constant part of the URL to be accessed.
+ * @param params an array of String values, that contain an alternation of
+ * parameter name, and parameter values.
+ * @throws IOException if the connection fails.
+ */
+ public long getLong(String baseUrl, String... params)
+ throws IOException {
+ HttpGet request = new HttpGet(buildUrl(baseUrl, params));
+
+ return new RequestExecutor<Long>(this)
+ .runObjectRequest(request, (ObjectInputStream o) ->
o.readLong());
+ }
+
+ /**
+ * Calls a web service action (i.e. it connects to a URL), and reads a
+ * serialised double value from the resulting connection. If the connection
+ * fails, for whatever reason, or the response code is different from
+ * {@link HttpURLConnection#HTTP_OK}, then an IOException is raised.
+ * This method will drain (and discard) all additional content available
from
+ * either the input and error streams of the resulting connection (which
+ * should permit connection keepalives).
+ *
+ * @param baseUrl the constant part of the URL to be accessed.
+ * @param params an array of String values, that contain an alternation of
+ * parameter name, and parameter values.
+ * @throws IOException if the connection fails.
+ */
+ public double getDouble(String baseUrl, String... params)
+ throws IOException {
+ HttpGet request = new HttpGet(buildUrl(baseUrl, params));
+
+ return new RequestExecutor<Double>(this)
+ .runObjectRequest(request, (ObjectInputStream o) ->
o.readDouble());
+ }
+
+ /**
+ * Calls a web service action (i.e. it connects to a URL), and reads a
+ * serialised boolean value from the resulting connection. If the
connection
+ * fails, for whatever reason, or the response code is different from
+ * {@link HttpURLConnection#HTTP_OK}, then an IOException is raised.
+ * This method will drain (and discard) all additional content available
from
+ * either the input and error streams of the resulting connection (which
+ * should permit connection keepalives).
+ *
+ * @param baseUrl the constant part of the URL to be accessed.
+ * @param params an array of String values, that contain an alternation of
+ * parameter name, and parameter values.
+ * @throws IOException if the connection fails.
+ */
+ public boolean getBoolean(String baseUrl, String... params)
+ throws IOException {
+ HttpGet request = new HttpGet(buildUrl(baseUrl, params));
+
+ return new RequestExecutor<Boolean>(this)
+ .runObjectRequest(request, ObjectInputStream::readBoolean);
+ }
+
+ /**
+ * Calls a web service action (i.e. it connects to a URL), and reads a
+ * serialised Object value from the resulting connection. If the connection
+ * fails, for whatever reason, or the response code is different from
+ * {@link HttpURLConnection#HTTP_OK}, then an IOException is raised.
+ * This method will drain (and discard) all additional content available
from
+ * either the input and error streams of the resulting connection (which
+ * should permit connection keepalives).
+ *
+ * @param baseUrl the constant part of the URL to be accessed.
+ * @param params an array of String values, that contain an alternation of
+ * parameter name, and parameter values.
+ * @throws IOException if the connection fails.
+ * @throws ClassNotFoundException if the value read from the remote
connection
+ * is of a type unknown to the local JVM.
+ */
+ public Object getObject(String baseUrl, String... params)
+ throws IOException, ClassNotFoundException {
+ HttpGet request = new HttpGet(buildUrl(baseUrl, params));
+
+ try {
+ return new RequestExecutor<>(this)
+ .runObjectRequest(request, ObjectInputStream::readObject);
+
+ } catch (RuntimeException e) {
+ if (e.getCause() instanceof ClassNotFoundException) {
+ throw (ClassNotFoundException) e.getCause();
+ } else {
+ throw e;
+ }
+ }
+ }
+
+ /**
+ * Calls a web service action (i.e. it connects to a URL) using the POST
HTTP
+ * method, sending the given object in Java serialized format as the
request
+ * body. The request is sent using chunked transfer encoding, and the
+ * request's Content-Type is set to application/octet-stream. If the
+ * connection fails, for whatever reason, or the response code is different
+ * from {@link HttpURLConnection#HTTP_OK}, then an IOException is raised.
+ * This method will drain (and discard) all content available from either
the
+ * input and error streams of the resulting connection (which should permit
+ * connection keepalives).
+ *
+ * @param baseUrl the constant part of the URL to be accessed.
+ * @param object the object to serialize and send in the POST body
+ * @param params an array of String values, that contain an alternation of
+ * parameter name, and parameter values.
+ * @throws IOException if the connection fails.
+ */
+ public void postObject(String baseUrl, Serializable object,
+ String... params) throws IOException {
+ HttpPost request = new HttpPost(buildUrl(baseUrl, params));
+
+ request.setHeader("Content-Type", "application/octet-stream");
+ // Set up the entity to send to the server.
+ SerializableEntity entity = new SerializableEntity(object);
+ entity.setChunked(true);
+ request.setEntity(entity);
+
+ // Now run the request
+ new RequestExecutor<Void>(this)
+ .runRequest(request, a -> null);
+ }
+
+ /**
+ * Calls a web service action (i.e. it connects to a URL) using the POST
HTTP
+ * method, sending the given bytes as the request
+ * body. The request is sent using chunked transfer encoding, and the
+ * request's Content-Type is set to application/octet-stream. If the
+ * connection fails, for whatever reason, or the response code is different
+ * from {@link HttpURLConnection#HTTP_OK}, then an IOException is raised.
+ * This method will drain (and discard) all content available from either
the
+ * input and error streams of the resulting connection (which should permit
+ * connection keepalives).
+ *
+ * @param baseUrl the constant part of the URL to be accessed.
+ * @param data a {@link ByteArrayOutputStream} containing the data to be
+ * written. Its {@link
ByteArrayOutputStream#writeTo(OutputStream)} method
+ * will be called causing it to write its data to the
output connection.
+ * @param params an array of String values, that contain an alternation of
+ * parameter name, and parameter values.
+ * @throws IOException if the connection fails.
+ */
+ public void postData(String baseUrl, ByteArrayOutputStream data,
+ String... params) throws IOException {
+ HttpPost request = new HttpPost(buildUrl(baseUrl, params));
+
+ request.setHeader("Content-Type", "application/octet-stream");
+
+ ByteArrayEntity entity = new ByteArrayEntity(data.toByteArray());
+ entity.setChunked(true);
+ request.setEntity(entity);
+
+ new RequestExecutor<Void>(this)
+ .runRequest(request, a -> null);
+ }
+
+ /**
+ * Calls a web service action (i.e. it connects to a URL) using the POST
HTTP
+ * method, sending the given object in Java serialized format as the
request
+ * body. The request is sent using chunked transfer encoding, and the
+ * request's Content-Type is set to application/octet-stream. If the
+ * connection fails, for whatever reason, or the response code is different
+ * from {@link HttpURLConnection#HTTP_OK}, then an IOException is raised.
+ * The response from the server is read and Java-deserialized, the
resulting
+ * Object being returned.
+ * <p>
+ * This method will then drain (and discard) all the remaining content
+ * available from either the input and error streams of the resulting
+ * connection (which should permit connection keepalives).
+ *
+ * @param baseUrl the constant part of the URL to be accessed.
+ * @param object the object to serialize and send in the POST body
+ * @param params an array of String values, that contain an alternation of
+ * parameter name, and parameter values.
+ * @return the de-serialized value sent by the remote endpoint.
+ * @throws IOException if the connection fails.
+ * @throws ClassNotFoundException if the data sent from the remote endpoint
+ * cannot be deserialized to a class
locally known.
+ */
+ public Object rpcCall(String baseUrl, Serializable object,
+ String... params) throws IOException,
ClassNotFoundException {
+ HttpPost request = new HttpPost(buildUrl(baseUrl, params));
+ request.setHeader("Content-Type", "application/octet-stream");
+ // Set up the entity to send to the server.
+ SerializableEntity entity = new SerializableEntity(object);
+ entity.setChunked(true);
+ request.setEntity(entity);
+
+ // Now run the request
+ return new RequestExecutor<>(this)
+ .runObjectRequest(request, ObjectInputStream::readObject);
+ }
+
+ protected static class RequestExecutor<T> {
+ private WebUtils webUtils;
+
+ RequestExecutor(WebUtils webUtils) {
+ this.webUtils = webUtils;
+ }
+
+ public T runRequest(HttpUriRequest request, CheckedRequestConsumer<T>
consumer) throws IOException {
+ CloseableHttpResponse response = webUtils.execute(request);
+ try {
+ long code = response.getStatusLine().getStatusCode();
+
+ if (code == HttpURLConnection.HTTP_OK) {
+ // try to get more details
+ return consumer.run(response);
+ } else {
+ // some problem -> try to get more details
+ String message =
response.getStatusLine().getReasonPhrase();
+ throw new IOException(code
+ + (message != null ? " (" + message + ")" : "")
+ + " Remote connection failed.");
+ }
+ } catch (ClassNotFoundException e) {
+ throw new RuntimeException(e);
+ } finally {
+ // make sure the connection is drained, to allow connection
keepalive
+ response.close();
+ }
+ }
+
+ public T runObjectRequest(HttpUriRequest request, final
CheckedObjectInputStreamConsumer<T> consumer) throws IOException {
+ return runRequest(request, (CloseableHttpResponse response) -> {
+ InputStream contentInputStream = null;
+ try {
+ contentInputStream = response.getEntity().getContent();
+ return consumer.run(new
ObjectInputStream(contentInputStream));
+ } finally {
+ contentInputStream.close();
+ }
+ });
+ }
+
+
+ public interface CheckedRequestConsumer<T> {
+ T run(CloseableHttpResponse response) throws IOException,
ClassNotFoundException;
+ }
+
+ public interface CheckedObjectInputStreamConsumer<T> {
+ T run(ObjectInputStream response) throws IOException,
ClassNotFoundException;
+ }
+ }
+
+
+}
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