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Add AsyncResultHolder. 

Change-Id: Icfa685bcda2f5c74f5649f09098d00b4bd321c5a
main
Yuichiro Hanada 2013-09-09 23:10:33 +09:00
parent 1d4a07f6c7
commit acdabb25f4
3 changed files with 151 additions and 19 deletions
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26
java/src/com/android/inputmethod/latin/LatinIME.java
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@ -86,6 +86,7 @@ import com.android.inputmethod.latin.settings.SettingsActivity;
import com.android.inputmethod.latin.settings.SettingsValues;
import com.android.inputmethod.latin.suggestions.SuggestionStripView;
import com.android.inputmethod.latin.utils.ApplicationUtils;
import com.android.inputmethod.latin.utils.AsyncResultHolder;
import com.android.inputmethod.latin.utils.AutoCorrectionUtils;
import com.android.inputmethod.latin.utils.CapsModeUtils;
import com.android.inputmethod.latin.utils.CollectionUtils;
@ -107,8 +108,6 @@ import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Locale;
import java.util.TreeSet;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
/**
* Input method implementation for Qwerty'ish keyboard.
@ -2428,31 +2427,20 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
return;
}
final CountDownLatch latch = new CountDownLatch(1);
final SuggestedWords[] suggestedWordsArray = new SuggestedWords[1];
final AsyncResultHolder<SuggestedWords> holder = new AsyncResultHolder<SuggestedWords>();
getSuggestedWordsOrOlderSuggestionsAsync(Suggest.SESSION_TYPING,
new OnGetSuggestedWordsCallback() {
@Override
public void onGetSuggestedWords(final SuggestedWords suggestedWords) {
suggestedWordsArray[0] = suggestedWords;
latch.countDown();
holder.set(suggestedWords);
}
}
);
// TODO: Quit blocking the main thread.
try {
// Wait for the result of getSuggestedWords
// We set the time out to avoid ANR.
latch.await(GET_SUGGESTED_WORDS_TIMEOUT, TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
// TODO: Cancel all pending "getSuggestedWords" tasks when it failed. We may want to add
// "onGetSuggestionFailed" to "OnGetSuggestedWordsCallback".
Log.e(TAG, "InterruptedException while waiting for getSuggestedWords.", e);
return;
}
if (suggestedWordsArray[0] != null) {
showSuggestionStrip(suggestedWordsArray[0]);
// This line may cause the current thread to wait.
final SuggestedWords suggestedWords = holder.get(null, GET_SUGGESTED_WORDS_TIMEOUT);
if (suggestedWords != null) {
showSuggestionStrip(suggestedWords);
}
}

71
java/src/com/android/inputmethod/latin/utils/AsyncResultHolder.java Normal file
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@ -0,0 +1,71 @@
/*
* Copyright (C) 2013 The Android Open Source Project
*
* 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 com.android.inputmethod.latin.utils;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
/**
* This class is a holder of a result of asynchronous computation.
*
* @param <E> the type of the result.
*/
public class AsyncResultHolder<E> {
private final Object mLock = new Object();
private E mResult;
private final CountDownLatch mLatch;
public AsyncResultHolder() {
mLatch = new CountDownLatch(1);
}
/**
* Sets the result value to this holder.
*
* @param result the value which is set.
*/
public void set(final E result) {
synchronized(mLock) {
if (mLatch.getCount() > 0) {
mResult = result;
mLatch.countDown();
}
}
}
/**
* Gets the result value held in this holder.
* Causes the current thread to wait unless the value is set or the specified time is elapsed.
*
* @param defaultValue the default value.
* @param timeOut the time to wait.
* @return if the result is set until the time limit then the result, otherwise defaultValue.
*/
public E get(final E defaultValue, final long timeOut) {
try {
if(mLatch.await(timeOut, TimeUnit.MILLISECONDS)) {
return mResult;
} else {
return defaultValue;
}
} catch (InterruptedException e) {
return defaultValue;
}
}
}

73
tests/src/com/android/inputmethod/latin/utils/AsyncResultHolderTests.java Normal file
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@ -0,0 +1,73 @@
/*
* Copyright (C) 2013 The Android Open Source Project
*
* 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 com.android.inputmethod.latin.utils;
import android.test.AndroidTestCase;
import android.test.suitebuilder.annotation.MediumTest;
import android.util.Log;
@MediumTest
public class AsyncResultHolderTests extends AndroidTestCase {
private static final String TAG = AsyncResultHolderTests.class.getSimpleName();
private static final int TIMEOUT_IN_MILLISECONDS = 500;
private static final int MARGIN_IN_MILLISECONDS = 250;
private static final int DEFAULT_VALUE = 2;
private static final int SET_VALUE = 1;
private <T> void setAfterGivenTime(final AsyncResultHolder<T> holder, final T value,
final long time) {
new Thread(new Runnable() {
@Override
public void run() {
try {
Thread.sleep(time);
} catch (InterruptedException e) {
Log.d(TAG, "Exception while sleeping", e);
}
holder.set(value);
}
}).start();
}
public void testGetWithoutSet() {
final AsyncResultHolder<Integer> holder = new AsyncResultHolder<Integer>();
final int resultValue = holder.get(DEFAULT_VALUE, TIMEOUT_IN_MILLISECONDS);
assertEquals(DEFAULT_VALUE, resultValue);
}
public void testGetBeforeSet() {
final AsyncResultHolder<Integer> holder = new AsyncResultHolder<Integer>();
setAfterGivenTime(holder, SET_VALUE, TIMEOUT_IN_MILLISECONDS + MARGIN_IN_MILLISECONDS);
final int resultValue = holder.get(DEFAULT_VALUE, TIMEOUT_IN_MILLISECONDS);
assertEquals(DEFAULT_VALUE, resultValue);
}
public void testGetAfterSet() {
final AsyncResultHolder<Integer> holder = new AsyncResultHolder<Integer>();
holder.set(SET_VALUE);
final int resultValue = holder.get(DEFAULT_VALUE, TIMEOUT_IN_MILLISECONDS);
assertEquals(SET_VALUE, resultValue);
}
public void testGetBeforeTimeout() {
final AsyncResultHolder<Integer> holder = new AsyncResultHolder<Integer>();
setAfterGivenTime(holder, SET_VALUE, TIMEOUT_IN_MILLISECONDS - MARGIN_IN_MILLISECONDS);
final int resultValue = holder.get(DEFAULT_VALUE, TIMEOUT_IN_MILLISECONDS);
assertEquals(SET_VALUE, resultValue);
}
}