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GWT: only allow a single compeltion request at a time.

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This commit is contained in:
bjorn
2008-09-15 14:39:25 +00:00
parent 6edca9983a
commit ce50458877
3 changed files with 40 additions and 10 deletions
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10
src/server/gwt-client/src/se/chalmers/cs/gf/gwt_translate/client/CompletionOracle.java
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@@ -10,6 +10,9 @@ public class CompletionOracle extends SuggestOracle {
private List<String> inputLangs; private List<String> inputLangs;
private GFRequest gfRequest = null;
public CompletionOracle (GF gf) { public CompletionOracle (GF gf) {
this.gf = gf; this.gf = gf;
inputLangs = new ArrayList<String>(); inputLangs = new ArrayList<String>();
@@ -39,7 +42,12 @@ public class CompletionOracle extends SuggestOracle {
} }
public void requestSuggestions(final SuggestOracle.Request request, final SuggestOracle.Callback callback) { public void requestSuggestions(final SuggestOracle.Request request, final SuggestOracle.Callback callback) {
gf.complete(request.getQuery(), getInputLangs(), null, request.getLimit(),
// only allow a single completion request at a time
if (gfRequest != null)
gfRequest.cancel();
gfRequest = gf.complete(request.getQuery(), getInputLangs(), null, request.getLimit(),
new GF.CompleteCallback() { new GF.CompleteCallback() {
public void onCompleteDone(GF.Completions completions) { public void onCompleteDone(GF.Completions completions) {
Collection<CompletionSuggestion> suggestions = new ArrayList<CompletionSuggestion>(); Collection<CompletionSuggestion> suggestions = new ArrayList<CompletionSuggestion>();

21
src/server/gwt-client/src/se/chalmers/cs/gf/gwt_translate/client/GF.java
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@@ -23,8 +23,8 @@ public class GF {
/* Languages */ /* Languages */
public void languages (final LanguagesCallback callback) { public GFRequest languages (final LanguagesCallback callback) {
sendRequest("languages", null, new JSONRequestCallback() { return sendRequest("languages", null, new JSONRequestCallback() {
public void onJSONReceived(JSONValue json) { public void onJSONReceived(JSONValue json) {
callback.onLanguagesDone((Languages)json.isArray().getJavaScriptObject().cast()); callback.onLanguagesDone((Languages)json.isArray().getJavaScriptObject().cast());
} }
@@ -50,7 +50,7 @@ public class GF {
/* Translation */ /* Translation */
public void translate (String input, List<String> fromLangs, String cat, List<String> toLangs, public GFRequest translate (String input, List<String> fromLangs, String cat, List<String> toLangs,
final TranslateCallback callback) { final TranslateCallback callback) {
List<Arg> args = new ArrayList<Arg>(); List<Arg> args = new ArrayList<Arg>();
args.add(new Arg("input", input)); args.add(new Arg("input", input));
@@ -65,7 +65,7 @@ public class GF {
args.add(new Arg("to", to)); args.add(new Arg("to", to));
} }
} }
sendRequest("translate", args, new JSONRequestCallback() { return sendRequest("translate", args, new JSONRequestCallback() {
public void onJSONReceived(JSONValue json) { public void onJSONReceived(JSONValue json) {
callback.onTranslateDone((Translations)json.isArray().getJavaScriptObject().cast()); callback.onTranslateDone((Translations)json.isArray().getJavaScriptObject().cast());
} }
@@ -89,8 +89,8 @@ public class GF {
} }
/* Completion */ /* Completion */
public void complete (String input, List<String> fromLangs, String cat, int limit, final CompleteCallback callback) { public GFRequest complete (String input, List<String> fromLangs, String cat, int limit, final CompleteCallback callback) {
List<Arg> args = new ArrayList<Arg>(); List<Arg> args = new ArrayList<Arg>();
args.add(new Arg("input", input)); args.add(new Arg("input", input));
if (fromLangs != null) { if (fromLangs != null) {
@@ -100,7 +100,7 @@ public class GF {
} }
args.add(new Arg("cat", cat)); args.add(new Arg("cat", cat));
args.add(new Arg("limit", limit)); args.add(new Arg("limit", limit));
sendRequest("complete", args, new JSONRequestCallback() { return sendRequest("complete", args, new JSONRequestCallback() {
public void onJSONReceived(JSONValue json) { public void onJSONReceived(JSONValue json) {
callback.onCompleteDone((Completions)json.isArray().getJavaScriptObject().cast()); callback.onCompleteDone((Completions)json.isArray().getJavaScriptObject().cast());
} }
@@ -129,12 +129,13 @@ public class GF {
public void onJSONReceived(JSONValue json); public void onJSONReceived(JSONValue json);
} }
private void sendRequest (String resource, List<Arg> vars, final JSONRequestCallback callback) { private GFRequest sendRequest (String resource, List<Arg> vars, final JSONRequestCallback callback) {
String url = baseURL + "/" + resource + "?" + buildQueryString(vars); String url = baseURL + "/" + resource + "?" + buildQueryString(vars);
RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, url); RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, url);
Request request = null;
try { try {
Request request = builder.sendRequest(null, new RequestCallback() { request = builder.sendRequest(null, new RequestCallback() {
public void onError(Request request, Throwable e) { public void onError(Request request, Throwable e) {
GWT.log("onError called", e); GWT.log("onError called", e);
} }
@@ -150,6 +151,8 @@ public class GF {
} catch (RequestException e) { } catch (RequestException e) {
GWT.log("Failed to send request", e); GWT.log("Failed to send request", e);
} }
return new GFRequest(request);
} }
private static class Arg { private static class Arg {

19
src/server/gwt-client/src/se/chalmers/cs/gf/gwt_translate/client/GFRequest.java Normal file
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@@ -0,0 +1,19 @@
package se.chalmers.cs.gf.gwt_translate.client;
import com.google.gwt.http.client.*;
public class GFRequest {
private Request httpRequest;
GFRequest (Request httpRequest) {
this.httpRequest = httpRequest;
}
public void cancel() {
if (httpRequest != null) {
httpRequest.cancel();
}
}
}