Make memory info provider a singleton because we dont want multiple i…

…nstances of it

src/main/java/net/snowflake/ingest/streaming/internal/MemoryInfoProviderFromRuntime.java

@@ -13,8 +13,10 @@ public class MemoryInfoProviderFromRuntime implements MemoryInfoProvider {
   private final long maxMemory;
   private volatile long totalFreeMemory;
   private final ScheduledExecutorService executorService;
+  private static final long FREE_MEMORY_UPDATE_INTERVAL_MS = 1000;
+  private static final MemoryInfoProviderFromRuntime INSTANCE = new MemoryInfoProviderFromRuntime(FREE_MEMORY_UPDATE_INTERVAL_MS);
 
-  public MemoryInfoProviderFromRuntime(long freeMemoryUpdateIntervalMs) {
+  private MemoryInfoProviderFromRuntime(long freeMemoryUpdateIntervalMs) {
     maxMemory = Runtime.getRuntime().maxMemory();
     totalFreeMemory =
         Runtime.getRuntime().freeMemory() + (maxMemory - Runtime.getRuntime().totalMemory());
@@ -35,6 +37,10 @@ private void updateFreeMemory() {
         Runtime.getRuntime().freeMemory() + (maxMemory - Runtime.getRuntime().totalMemory());
   }
 
+  public static MemoryInfoProviderFromRuntime getInstance() {
+    return INSTANCE;
+  }
+
   @Override
   public long getMaxMemory() {
     return maxMemory;

src/main/java/net/snowflake/ingest/streaming/internal/SnowflakeStreamingIngestChannelInternal.java

@@ -138,7 +138,7 @@ class SnowflakeStreamingIngestChannelInternal<T> implements SnowflakeStreamingIn
     this.maxMemoryLimitInBytes =
         this.owningClient.getParameterProvider().getMaxMemoryLimitInBytes();
 
-    this.memoryInfoProvider = new MemoryInfoProviderFromRuntime(insertThrottleIntervalInMs);
+    this.memoryInfoProvider = MemoryInfoProviderFromRuntime.getInstance();
     this.channelFlushContext =
         new ChannelFlushContext(
             name, dbName, schemaName, tableName, channelSequencer, encryptionKey, encryptionKeyId);