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Merge pull request #6717 from luchua-bc/java/thread-resource-abuse
Java: CWE-400 - Query to detect uncontrolled thread resource consumption
This commit is contained in:
Chris Smowton
@@ -0,0 +1,23 @@
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edges
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| ThreadResourceAbuse.java:37:25:37:73 | getInitParameter(...) : String | ThreadResourceAbuse.java:40:28:40:36 | delayTime : Number |
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| ThreadResourceAbuse.java:40:4:40:37 | new UncheckedSyncAction(...) [waitTime] : Number | ThreadResourceAbuse.java:71:15:71:17 | parameter this [waitTime] : Number |
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| ThreadResourceAbuse.java:40:28:40:36 | delayTime : Number | ThreadResourceAbuse.java:40:4:40:37 | new UncheckedSyncAction(...) [waitTime] : Number |
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| ThreadResourceAbuse.java:40:28:40:36 | delayTime : Number | ThreadResourceAbuse.java:66:30:66:41 | waitTime : Number |
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| ThreadResourceAbuse.java:66:30:66:41 | waitTime : Number | ThreadResourceAbuse.java:67:20:67:27 | waitTime : Number |
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| ThreadResourceAbuse.java:67:20:67:27 | waitTime : Number | ThreadResourceAbuse.java:67:4:67:7 | this [post update] [waitTime] : Number |
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| ThreadResourceAbuse.java:71:15:71:17 | parameter this [waitTime] : Number | ThreadResourceAbuse.java:74:18:74:25 | this <.field> [waitTime] : Number |
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| ThreadResourceAbuse.java:74:18:74:25 | this <.field> [waitTime] : Number | ThreadResourceAbuse.java:74:18:74:25 | waitTime |
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nodes
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| ThreadResourceAbuse.java:37:25:37:73 | getInitParameter(...) : String | semmle.label | getInitParameter(...) : String |
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| ThreadResourceAbuse.java:40:4:40:37 | new UncheckedSyncAction(...) [waitTime] : Number | semmle.label | new UncheckedSyncAction(...) [waitTime] : Number |
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| ThreadResourceAbuse.java:40:28:40:36 | delayTime : Number | semmle.label | delayTime : Number |
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| ThreadResourceAbuse.java:66:30:66:41 | waitTime : Number | semmle.label | waitTime : Number |
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| ThreadResourceAbuse.java:67:4:67:7 | this [post update] [waitTime] : Number | semmle.label | this [post update] [waitTime] : Number |
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| ThreadResourceAbuse.java:67:20:67:27 | waitTime : Number | semmle.label | waitTime : Number |
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| ThreadResourceAbuse.java:71:15:71:17 | parameter this [waitTime] : Number | semmle.label | parameter this [waitTime] : Number |
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| ThreadResourceAbuse.java:74:18:74:25 | this <.field> [waitTime] : Number | semmle.label | this <.field> [waitTime] : Number |
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| ThreadResourceAbuse.java:74:18:74:25 | waitTime | semmle.label | waitTime |
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subpaths
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| ThreadResourceAbuse.java:40:28:40:36 | delayTime : Number | ThreadResourceAbuse.java:66:30:66:41 | waitTime : Number | ThreadResourceAbuse.java:67:4:67:7 | this [post update] [waitTime] : Number | ThreadResourceAbuse.java:40:4:40:37 | new UncheckedSyncAction(...) [waitTime] : Number |
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#select
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| ThreadResourceAbuse.java:74:18:74:25 | waitTime | ThreadResourceAbuse.java:37:25:37:73 | getInitParameter(...) : String | ThreadResourceAbuse.java:74:18:74:25 | waitTime | Possible uncontrolled resource consumption due to $@. | ThreadResourceAbuse.java:37:25:37:73 | getInitParameter(...) | local user-provided value |
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@@ -0,0 +1 @@
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experimental/Security/CWE/CWE-400/LocalThreadResourceAbuse.ql
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@@ -0,0 +1,68 @@
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edges
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| ThreadResourceAbuse.java:18:25:18:57 | getParameter(...) : String | ThreadResourceAbuse.java:21:28:21:36 | delayTime : Number |
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| ThreadResourceAbuse.java:21:4:21:37 | new UncheckedSyncAction(...) [waitTime] : Number | ThreadResourceAbuse.java:71:15:71:17 | parameter this [waitTime] : Number |
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| ThreadResourceAbuse.java:21:28:21:36 | delayTime : Number | ThreadResourceAbuse.java:21:4:21:37 | new UncheckedSyncAction(...) [waitTime] : Number |
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| ThreadResourceAbuse.java:21:28:21:36 | delayTime : Number | ThreadResourceAbuse.java:66:30:66:41 | waitTime : Number |
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| ThreadResourceAbuse.java:29:82:29:114 | getParameter(...) : String | ThreadResourceAbuse.java:30:28:30:36 | delayTime : Number |
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| ThreadResourceAbuse.java:30:4:30:37 | new UncheckedSyncAction(...) [waitTime] : Number | ThreadResourceAbuse.java:71:15:71:17 | parameter this [waitTime] : Number |
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| ThreadResourceAbuse.java:30:28:30:36 | delayTime : Number | ThreadResourceAbuse.java:30:4:30:37 | new UncheckedSyncAction(...) [waitTime] : Number |
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| ThreadResourceAbuse.java:30:28:30:36 | delayTime : Number | ThreadResourceAbuse.java:66:30:66:41 | waitTime : Number |
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| ThreadResourceAbuse.java:66:30:66:41 | waitTime : Number | ThreadResourceAbuse.java:67:20:67:27 | waitTime : Number |
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| ThreadResourceAbuse.java:67:20:67:27 | waitTime : Number | ThreadResourceAbuse.java:67:4:67:7 | this [post update] [waitTime] : Number |
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| ThreadResourceAbuse.java:71:15:71:17 | parameter this [waitTime] : Number | ThreadResourceAbuse.java:74:18:74:25 | this <.field> [waitTime] : Number |
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| ThreadResourceAbuse.java:74:18:74:25 | this <.field> [waitTime] : Number | ThreadResourceAbuse.java:74:18:74:25 | waitTime |
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| ThreadResourceAbuse.java:141:27:141:43 | getValue(...) : String | ThreadResourceAbuse.java:144:34:144:42 | delayTime |
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| ThreadResourceAbuse.java:172:19:172:50 | getHeader(...) : String | ThreadResourceAbuse.java:176:17:176:26 | retryAfter |
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| ThreadResourceAbuse.java:206:28:206:56 | getParameter(...) : String | ThreadResourceAbuse.java:209:49:209:59 | uploadDelay : Number |
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| ThreadResourceAbuse.java:209:30:209:87 | new UploadListener(...) [slowUploads] : Number | UploadListener.java:28:14:28:19 | parameter this [slowUploads] : Number |
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| ThreadResourceAbuse.java:209:49:209:59 | uploadDelay : Number | ThreadResourceAbuse.java:209:30:209:87 | new UploadListener(...) [slowUploads] : Number |
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| ThreadResourceAbuse.java:209:49:209:59 | uploadDelay : Number | UploadListener.java:15:24:15:44 | sleepMilliseconds : Number |
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| UploadListener.java:15:24:15:44 | sleepMilliseconds : Number | UploadListener.java:16:17:16:33 | sleepMilliseconds : Number |
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| UploadListener.java:16:17:16:33 | sleepMilliseconds : Number | UploadListener.java:16:3:16:13 | this <.field> [post update] [slowUploads] : Number |
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| UploadListener.java:28:14:28:19 | parameter this [slowUploads] : Number | UploadListener.java:29:3:29:11 | this <.field> [slowUploads] : Number |
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| UploadListener.java:29:3:29:11 | this <.field> [slowUploads] : Number | UploadListener.java:30:3:30:15 | this <.field> [slowUploads] : Number |
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| UploadListener.java:30:3:30:15 | this <.field> [slowUploads] : Number | UploadListener.java:33:7:33:17 | this <.field> [slowUploads] : Number |
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| UploadListener.java:30:3:30:15 | this <.field> [slowUploads] : Number | UploadListener.java:35:18:35:28 | this <.field> [slowUploads] : Number |
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| UploadListener.java:33:7:33:17 | slowUploads : Number | UploadListener.java:35:18:35:28 | slowUploads |
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| UploadListener.java:33:7:33:17 | this <.field> [slowUploads] : Number | UploadListener.java:33:7:33:17 | slowUploads : Number |
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| UploadListener.java:35:18:35:28 | this <.field> [slowUploads] : Number | UploadListener.java:35:18:35:28 | slowUploads |
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nodes
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| ThreadResourceAbuse.java:18:25:18:57 | getParameter(...) : String | semmle.label | getParameter(...) : String |
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| ThreadResourceAbuse.java:21:4:21:37 | new UncheckedSyncAction(...) [waitTime] : Number | semmle.label | new UncheckedSyncAction(...) [waitTime] : Number |
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| ThreadResourceAbuse.java:21:28:21:36 | delayTime : Number | semmle.label | delayTime : Number |
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| ThreadResourceAbuse.java:29:82:29:114 | getParameter(...) : String | semmle.label | getParameter(...) : String |
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| ThreadResourceAbuse.java:30:4:30:37 | new UncheckedSyncAction(...) [waitTime] : Number | semmle.label | new UncheckedSyncAction(...) [waitTime] : Number |
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| ThreadResourceAbuse.java:30:28:30:36 | delayTime : Number | semmle.label | delayTime : Number |
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| ThreadResourceAbuse.java:66:30:66:41 | waitTime : Number | semmle.label | waitTime : Number |
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| ThreadResourceAbuse.java:67:4:67:7 | this [post update] [waitTime] : Number | semmle.label | this [post update] [waitTime] : Number |
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| ThreadResourceAbuse.java:67:20:67:27 | waitTime : Number | semmle.label | waitTime : Number |
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| ThreadResourceAbuse.java:71:15:71:17 | parameter this [waitTime] : Number | semmle.label | parameter this [waitTime] : Number |
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| ThreadResourceAbuse.java:74:18:74:25 | this <.field> [waitTime] : Number | semmle.label | this <.field> [waitTime] : Number |
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| ThreadResourceAbuse.java:74:18:74:25 | waitTime | semmle.label | waitTime |
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| ThreadResourceAbuse.java:141:27:141:43 | getValue(...) : String | semmle.label | getValue(...) : String |
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| ThreadResourceAbuse.java:144:34:144:42 | delayTime | semmle.label | delayTime |
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| ThreadResourceAbuse.java:172:19:172:50 | getHeader(...) : String | semmle.label | getHeader(...) : String |
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| ThreadResourceAbuse.java:176:17:176:26 | retryAfter | semmle.label | retryAfter |
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| ThreadResourceAbuse.java:206:28:206:56 | getParameter(...) : String | semmle.label | getParameter(...) : String |
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| ThreadResourceAbuse.java:209:30:209:87 | new UploadListener(...) [slowUploads] : Number | semmle.label | new UploadListener(...) [slowUploads] : Number |
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| ThreadResourceAbuse.java:209:49:209:59 | uploadDelay : Number | semmle.label | uploadDelay : Number |
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| UploadListener.java:15:24:15:44 | sleepMilliseconds : Number | semmle.label | sleepMilliseconds : Number |
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| UploadListener.java:16:3:16:13 | this <.field> [post update] [slowUploads] : Number | semmle.label | this <.field> [post update] [slowUploads] : Number |
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| UploadListener.java:16:17:16:33 | sleepMilliseconds : Number | semmle.label | sleepMilliseconds : Number |
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| UploadListener.java:28:14:28:19 | parameter this [slowUploads] : Number | semmle.label | parameter this [slowUploads] : Number |
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| UploadListener.java:29:3:29:11 | this <.field> [slowUploads] : Number | semmle.label | this <.field> [slowUploads] : Number |
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| UploadListener.java:30:3:30:15 | this <.field> [slowUploads] : Number | semmle.label | this <.field> [slowUploads] : Number |
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| UploadListener.java:33:7:33:17 | slowUploads : Number | semmle.label | slowUploads : Number |
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| UploadListener.java:33:7:33:17 | this <.field> [slowUploads] : Number | semmle.label | this <.field> [slowUploads] : Number |
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| UploadListener.java:35:18:35:28 | slowUploads | semmle.label | slowUploads |
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| UploadListener.java:35:18:35:28 | this <.field> [slowUploads] : Number | semmle.label | this <.field> [slowUploads] : Number |
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subpaths
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| ThreadResourceAbuse.java:21:28:21:36 | delayTime : Number | ThreadResourceAbuse.java:66:30:66:41 | waitTime : Number | ThreadResourceAbuse.java:67:4:67:7 | this [post update] [waitTime] : Number | ThreadResourceAbuse.java:21:4:21:37 | new UncheckedSyncAction(...) [waitTime] : Number |
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| ThreadResourceAbuse.java:30:28:30:36 | delayTime : Number | ThreadResourceAbuse.java:66:30:66:41 | waitTime : Number | ThreadResourceAbuse.java:67:4:67:7 | this [post update] [waitTime] : Number | ThreadResourceAbuse.java:30:4:30:37 | new UncheckedSyncAction(...) [waitTime] : Number |
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| ThreadResourceAbuse.java:209:49:209:59 | uploadDelay : Number | UploadListener.java:15:24:15:44 | sleepMilliseconds : Number | UploadListener.java:16:3:16:13 | this <.field> [post update] [slowUploads] : Number | ThreadResourceAbuse.java:209:30:209:87 | new UploadListener(...) [slowUploads] : Number |
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#select
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| ThreadResourceAbuse.java:74:18:74:25 | waitTime | ThreadResourceAbuse.java:18:25:18:57 | getParameter(...) : String | ThreadResourceAbuse.java:74:18:74:25 | waitTime | Vulnerability of uncontrolled resource consumption due to $@. | ThreadResourceAbuse.java:18:25:18:57 | getParameter(...) | user-provided value |
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| ThreadResourceAbuse.java:74:18:74:25 | waitTime | ThreadResourceAbuse.java:29:82:29:114 | getParameter(...) : String | ThreadResourceAbuse.java:74:18:74:25 | waitTime | Vulnerability of uncontrolled resource consumption due to $@. | ThreadResourceAbuse.java:29:82:29:114 | getParameter(...) | user-provided value |
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| ThreadResourceAbuse.java:144:34:144:42 | delayTime | ThreadResourceAbuse.java:141:27:141:43 | getValue(...) : String | ThreadResourceAbuse.java:144:34:144:42 | delayTime | Vulnerability of uncontrolled resource consumption due to $@. | ThreadResourceAbuse.java:141:27:141:43 | getValue(...) | user-provided value |
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| ThreadResourceAbuse.java:176:17:176:26 | retryAfter | ThreadResourceAbuse.java:172:19:172:50 | getHeader(...) : String | ThreadResourceAbuse.java:176:17:176:26 | retryAfter | Vulnerability of uncontrolled resource consumption due to $@. | ThreadResourceAbuse.java:172:19:172:50 | getHeader(...) | user-provided value |
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| UploadListener.java:35:18:35:28 | slowUploads | ThreadResourceAbuse.java:206:28:206:56 | getParameter(...) : String | UploadListener.java:35:18:35:28 | slowUploads | Vulnerability of uncontrolled resource consumption due to $@. | ThreadResourceAbuse.java:206:28:206:56 | getParameter(...) | user-provided value |
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@@ -0,0 +1,212 @@
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package test.cwe400.cwe.examples;
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import java.io.IOException;
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import java.util.concurrent.TimeUnit;
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import javax.servlet.ServletException;
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import javax.servlet.http.Cookie;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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public class ThreadResourceAbuse extends HttpServlet {
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static final int DEFAULT_RETRY_AFTER = 5*1000;
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static final int MAX_RETRY_AFTER = 10*1000;
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protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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// BAD: Get thread pause time from request parameter without validation
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String delayTimeStr = request.getParameter("DelayTime");
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try {
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int delayTime = Integer.valueOf(delayTimeStr);
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new UncheckedSyncAction(delayTime).start();
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} catch (NumberFormatException e) {
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}
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}
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protected void doGet2(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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// BAD: Get thread pause time from request parameter without validation
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try {
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int delayTime = request.getParameter("nodelay") != null ? 0 : Integer.valueOf(request.getParameter("DelayTime"));
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new UncheckedSyncAction(delayTime).start();
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} catch (NumberFormatException e) {
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}
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}
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protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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// BAD: Get thread pause time from context init parameter without validation
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String delayTimeStr = getServletContext().getInitParameter("DelayTime");
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try {
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int delayTime = Integer.valueOf(delayTimeStr);
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new UncheckedSyncAction(delayTime).start();
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} catch (NumberFormatException e) {
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}
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}
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protected void doPut(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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// GOOD: Get thread pause time from request cookie with validation
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Cookie[] cookies = request.getCookies();
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for ( int i=0; i<cookies.length; i++) {
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Cookie cookie = cookies[i];
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if (cookie.getName().equals("DelayTime")) {
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String delayTimeStr = cookie.getValue();
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try {
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int delayTime = Integer.valueOf(delayTimeStr);
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new CheckedSyncAction(delayTime).start();
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} catch (NumberFormatException e) {
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}
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}
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}
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}
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class UncheckedSyncAction extends Thread {
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int waitTime;
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public UncheckedSyncAction(int waitTime) {
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this.waitTime = waitTime;
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}
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@Override
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public void run() {
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// BAD: no boundary check on wait time
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try {
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Thread.sleep(waitTime);
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// Do other updates
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} catch (InterruptedException e) {
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}
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}
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}
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class CheckedSyncAction extends Thread {
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int waitTime;
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public CheckedSyncAction(int waitTime) {
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this.waitTime = waitTime;
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}
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@Override
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public void run() {
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// GOOD: enforce an upper limit on wait time
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try {
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if (waitTime > 0 && waitTime < 5000) {
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Thread.sleep(waitTime);
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// Do other updates
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}
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} catch (InterruptedException e) {
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}
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}
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}
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class CheckedSyncAction2 extends Thread {
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int waitTime;
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public CheckedSyncAction2(int waitTime) {
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this.waitTime = waitTime;
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}
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@Override
|
||||
public void run() {
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// GOOD: enforce an upper limit on wait time
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try {
|
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if (waitTime >= 5000) {
|
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// No action
|
||||
} else {
|
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Thread.sleep(waitTime);
|
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}
|
||||
// Do other updates
|
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} catch (InterruptedException e) {
|
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}
|
||||
}
|
||||
}
|
||||
|
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protected void doPost2(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
|
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// GOOD: Get thread pause time from init container parameter with validation
|
||||
String delayTimeStr = getServletContext().getInitParameter("DelayTime");
|
||||
try {
|
||||
int delayTime = Integer.valueOf(delayTimeStr);
|
||||
new CheckedSyncAction2(delayTime).start();
|
||||
} catch (NumberFormatException e) {
|
||||
}
|
||||
}
|
||||
|
||||
protected void doHead(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
|
||||
// BAD: Get thread pause time from request cookie without validation
|
||||
Cookie[] cookies = request.getCookies();
|
||||
|
||||
for ( int i=0; i<cookies.length; i++) {
|
||||
Cookie cookie = cookies[i];
|
||||
|
||||
if (cookie.getName().equals("DelayTime")) {
|
||||
String delayTimeStr = cookie.getValue();
|
||||
try {
|
||||
int delayTime = Integer.valueOf(delayTimeStr);
|
||||
TimeUnit.MILLISECONDS.sleep(delayTime);
|
||||
// Do other updates
|
||||
} catch (NumberFormatException ne) {
|
||||
} catch (InterruptedException ie) {
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
int parseRetryAfter(String value) {
|
||||
if (value == null || value.isEmpty()) {
|
||||
return DEFAULT_RETRY_AFTER;
|
||||
}
|
||||
|
||||
try {
|
||||
int n = Integer.parseInt(value);
|
||||
if (n < 0) {
|
||||
return DEFAULT_RETRY_AFTER;
|
||||
}
|
||||
|
||||
return Math.min(n, MAX_RETRY_AFTER);
|
||||
} catch (NumberFormatException e) {
|
||||
return DEFAULT_RETRY_AFTER;
|
||||
}
|
||||
}
|
||||
|
||||
protected void doHead2(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
|
||||
// BAD: Get thread pause time from request header without validation
|
||||
String header = request.getHeader("Retry-After");
|
||||
int retryAfter = Integer.parseInt(header);
|
||||
|
||||
try {
|
||||
Thread.sleep(retryAfter);
|
||||
} catch (InterruptedException ignore) {
|
||||
// ignore
|
||||
}
|
||||
}
|
||||
|
||||
protected void doHead3(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
|
||||
// GOOD: Get thread pause time from request header with validation
|
||||
String header = request.getHeader("Retry-After");
|
||||
int retryAfter = parseRetryAfter(header);
|
||||
|
||||
try {
|
||||
Thread.sleep(retryAfter);
|
||||
} catch (InterruptedException ignore) {
|
||||
// ignore
|
||||
}
|
||||
}
|
||||
|
||||
private long getContentLength(HttpServletRequest request) {
|
||||
long size = -1;
|
||||
try {
|
||||
size = Long.parseLong(request.getHeader("Content-length"));
|
||||
} catch (NumberFormatException e) {
|
||||
}
|
||||
return size;
|
||||
}
|
||||
|
||||
protected void doHead4(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
|
||||
// BAD: Get thread pause time from request header without validation
|
||||
try {
|
||||
String uploadDelayStr = request.getParameter("delay");
|
||||
int uploadDelay = Integer.parseInt(uploadDelayStr);
|
||||
|
||||
UploadListener listener = new UploadListener(uploadDelay, getContentLength(request));
|
||||
} catch (Exception e) { }
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1 @@
|
||||
experimental/Security/CWE/CWE-400/ThreadResourceAbuse.ql
|
||||
@@ -0,0 +1,40 @@
|
||||
package test.cwe400.cwe.examples;
|
||||
|
||||
import java.io.Serializable;
|
||||
import java.util.Date;
|
||||
|
||||
import javax.servlet.http.HttpServletRequest;
|
||||
|
||||
import org.apache.commons.fileupload2.ProgressListener;
|
||||
|
||||
public class UploadListener implements ProgressListener, Serializable {
|
||||
protected int slowUploads = 0;
|
||||
private Long bytesRead = 0L;
|
||||
private long contentLength = 0L;
|
||||
|
||||
public UploadListener(int sleepMilliseconds, long requestSize) {
|
||||
slowUploads = sleepMilliseconds;
|
||||
contentLength = requestSize;
|
||||
}
|
||||
|
||||
public long getPercent() {
|
||||
return contentLength != 0 ? bytesRead * 100 / contentLength : 0;
|
||||
}
|
||||
|
||||
public long getBytesRead() {
|
||||
return bytesRead;
|
||||
}
|
||||
|
||||
public void update(long done, long total, int item) {
|
||||
bytesRead = done;
|
||||
contentLength = total;
|
||||
|
||||
// Just a way to slow down the upload process and see the progress bar in fast networks.
|
||||
if (slowUploads > 0 && done < total) {
|
||||
try {
|
||||
Thread.sleep(slowUploads);
|
||||
} catch (Exception e) {
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1 @@
|
||||
//semmle-extractor-options: --javac-args -cp ${testdir}/../../../../stubs/servlet-api-2.4:${testdir}/../../../../stubs/apache-commons-fileupload-1.4
|
||||
@@ -0,0 +1,36 @@
|
||||
/*
|
||||
* 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.commons.fileupload2;
|
||||
|
||||
/**
|
||||
* The {@link ProgressListener} may be used to display a progress bar
|
||||
* or do stuff like that.
|
||||
*/
|
||||
public interface ProgressListener {
|
||||
|
||||
/**
|
||||
* Updates the listeners status information.
|
||||
*
|
||||
* @param pBytesRead The total number of bytes, which have been read
|
||||
* so far.
|
||||
* @param pContentLength The total number of bytes, which are being
|
||||
* read. May be -1, if this number is unknown.
|
||||
* @param pItems The number of the field, which is currently being
|
||||
* read. (0 = no item so far, 1 = first item is being read, ...)
|
||||
*/
|
||||
void update(long pBytesRead, long pContentLength, int pItems);
|
||||
}
|
||||
Reference in New Issue
Block a user