JAVA-API: Manual Library Loading Support for Restricted Environments (#2253)

* feat: Added LibraryLoader that allows loading to be skipped

* feat: Changed static call to new LibraryLoader

* feat: Makefile adjustment

@@ -6,7 +6,9 @@ out_jar := $(out_dir)/sherpa-onnx.jar
 
 package_dir := com/k2fsa/sherpa/onnx
 
-java_files := WaveReader.java
+java_files := LibraryLoader.java
+
+java_files += WaveReader.java
 java_files += WaveWriter.java
 java_files += EndpointRule.java
 java_files += EndpointConfig.java

@@ -3,13 +3,10 @@
 package com.k2fsa.sherpa.onnx;
 
 public class AudioTagging {
-    static {
-        System.loadLibrary("sherpa-onnx-jni");
-    }
-
     private long ptr = 0;
 
     public AudioTagging(AudioTaggingConfig config) {
+        LibraryLoader.maybeLoad();
         ptr = newFromFile(config);
     }
 

@@ -3,14 +3,11 @@
 package com.k2fsa.sherpa.onnx;
 
 public class DenoisedAudio {
-    static {
-        System.loadLibrary("sherpa-onnx-jni");
-    }
-
     private final float[] samples;
     private final int sampleRate;
 
     public DenoisedAudio(float[] samples, int sampleRate) {
+        LibraryLoader.maybeLoad();
         this.samples = samples;
         this.sampleRate = sampleRate;
     }

@@ -3,14 +3,11 @@
 package com.k2fsa.sherpa.onnx;
 
 public class GeneratedAudio {
-    static {
-        System.loadLibrary("sherpa-onnx-jni");
-    }
-
     private final float[] samples;
     private final int sampleRate;
 
     public GeneratedAudio(float[] samples, int sampleRate) {
+        LibraryLoader.maybeLoad();
         this.samples = samples;
         this.sampleRate = sampleRate;
     }

@@ -3,13 +3,10 @@
 package com.k2fsa.sherpa.onnx;
 
 public class KeywordSpotter {
-    static {
-        System.loadLibrary("sherpa-onnx-jni");
-    }
-
     private long ptr = 0;
 
     public KeywordSpotter(KeywordSpotterConfig config) {
+        LibraryLoader.maybeLoad();
         ptr = newFromFile(config);
     }
 

+package com.k2fsa.sherpa.onnx;
+
+public class LibraryLoader {
+    private static volatile boolean autoLoadEnabled = true;
+    private static volatile boolean isLoaded = false;
+
+    static synchronized void loadLibrary() {
+        if (!isLoaded) {
+            System.loadLibrary("sherpa-onnx-jni");
+            isLoaded = true;
+        }
+    }
+
+    public static void setAutoLoadEnabled(boolean enabled) {
+        autoLoadEnabled = enabled;
+    }
+
+    static void maybeLoad() {
+        if (autoLoadEnabled) {
+            loadLibrary();
+        }
+    }
+}
\ No newline at end of file

@@ -3,13 +3,10 @@
 package com.k2fsa.sherpa.onnx;
 
 public class OfflinePunctuation {
-    static {
-        System.loadLibrary("sherpa-onnx-jni");
-    }
-
     private long ptr = 0;
 
     public OfflinePunctuation(OfflinePunctuationConfig config) {
+        LibraryLoader.maybeLoad();
         ptr = newFromFile(config);
     }
 

@@ -3,13 +3,10 @@
 package com.k2fsa.sherpa.onnx;
 
 public class OfflineRecognizer {
-    static {
-        System.loadLibrary("sherpa-onnx-jni");
-    }
-
     private long ptr = 0;
 
     public OfflineRecognizer(OfflineRecognizerConfig config) {
+        LibraryLoader.maybeLoad();
         ptr = newFromFile(config);
     }
 

@@ -3,13 +3,10 @@
 package com.k2fsa.sherpa.onnx;
 
 public class OfflineSpeakerDiarization {
-    static {
-        System.loadLibrary("sherpa-onnx-jni");
-    }
-
     private long ptr = 0;
 
     public OfflineSpeakerDiarization(OfflineSpeakerDiarizationConfig config) {
+        LibraryLoader.maybeLoad();
         ptr = newFromFile(config);
     }
 

@@ -3,13 +3,10 @@
 package com.k2fsa.sherpa.onnx;
 
 public class OfflineSpeechDenoiser {
-    static {
-        System.loadLibrary("sherpa-onnx-jni");
-    }
-
     private long ptr = 0;
 
     public OfflineSpeechDenoiser(OfflineSpeechDenoiserConfig config) {
+        LibraryLoader.maybeLoad();
         ptr = newFromFile(config);
     }
 

@@ -3,13 +3,10 @@
 package com.k2fsa.sherpa.onnx;
 
 public class OfflineStream {
-    static {
-        System.loadLibrary("sherpa-onnx-jni");
-    }
-
     private long ptr = 0;
 
     public OfflineStream() {
+        LibraryLoader.maybeLoad();
         this.ptr = 0;
     }
 

@@ -4,13 +4,10 @@ package com.k2fsa.sherpa.onnx;
 
 
 public class OfflineTts {
-    static {
-        System.loadLibrary("sherpa-onnx-jni");
-    }
-
     private long ptr = 0;
 
     public OfflineTts(OfflineTtsConfig config) {
+        LibraryLoader.maybeLoad();
         ptr = newFromFile(config);
     }
 

@@ -3,13 +3,10 @@
 package com.k2fsa.sherpa.onnx;
 
 public class OnlinePunctuation {
-    static {
-        System.loadLibrary("sherpa-onnx-jni");
-    }
-
     private long ptr = 0;
 
     public OnlinePunctuation(OnlinePunctuationConfig config) {
+        LibraryLoader.maybeLoad();
         ptr = newFromFile(config);
     }
 

@@ -4,13 +4,10 @@
 package com.k2fsa.sherpa.onnx;
 
 public class OnlineRecognizer {
-    static {
-        System.loadLibrary("sherpa-onnx-jni");
-    }
-
     private long ptr = 0;
 
     public OnlineRecognizer(OnlineRecognizerConfig config) {
+        LibraryLoader.maybeLoad();
         ptr = newFromFile(config);
     }
 

@@ -4,13 +4,10 @@
 package com.k2fsa.sherpa.onnx;
 
 public class OnlineStream {
-    static {
-        System.loadLibrary("sherpa-onnx-jni");
-    }
-
     private long ptr = 0;
 
     public OnlineStream() {
+        LibraryLoader.maybeLoad();
         this.ptr = 0;
     }
 

@@ -3,13 +3,10 @@
 package com.k2fsa.sherpa.onnx;
 
 public class SpeakerEmbeddingExtractor {
-    static {
-        System.loadLibrary("sherpa-onnx-jni");
-    }
-
     private long ptr = 0;
 
     public SpeakerEmbeddingExtractor(SpeakerEmbeddingExtractorConfig config) {
+        LibraryLoader.maybeLoad();
         ptr = newFromFile(config);
     }
 

@@ -3,13 +3,10 @@
 package com.k2fsa.sherpa.onnx;
 
 public class SpeakerEmbeddingManager {
-    static {
-        System.loadLibrary("sherpa-onnx-jni");
-    }
-
     private long ptr = 0;
 
     public SpeakerEmbeddingManager(int dim) {
+        LibraryLoader.maybeLoad();
         ptr = create(dim);
     }
 

@@ -7,14 +7,11 @@ import java.util.Locale;
 import java.util.Map;
 
 public class SpokenLanguageIdentification {
-    static {
-        System.loadLibrary("sherpa-onnx-jni");
-    }
-
     private final Map<String, String> localeMap;
     private long ptr = 0;
 
     public SpokenLanguageIdentification(SpokenLanguageIdentificationConfig config) {
+        LibraryLoader.maybeLoad();
         ptr = newFromFile(config);
 
         String[] languages = Locale.getISOLanguages();

@@ -3,13 +3,10 @@
 package com.k2fsa.sherpa.onnx;
 
 public class Vad {
-    static {
-        System.loadLibrary("sherpa-onnx-jni");
-    }
-
     private long ptr = 0;
 
     public Vad(VadModelConfig config) {
+        LibraryLoader.maybeLoad();
         ptr = newFromFile(config);
     }
 

@@ -3,16 +3,13 @@
 package com.k2fsa.sherpa.onnx;
 
 public class WaveReader {
-    static {
-        System.loadLibrary("sherpa-onnx-jni");
-    }
-
     private final int sampleRate;
     private final float[] samples;
 
     // It supports only single channel, 16-bit wave file.
     // It will exit the program if the given file has a wrong format
     public WaveReader(String filename) {
+        LibraryLoader.maybeLoad();
         Object[] arr = readWaveFromFile(filename);
         samples = (float[]) arr[0];
         sampleRate = (int) arr[1];