From bbbae5fe23ec51b7e11ab31b19623d190d718fcf Mon Sep 17 00:00:00 2001
From: Andreas Fankhauser hiddenalpha.ch
Date: Thu, 29 Dec 2022 22:56:08 +0100
Subject: Add CloseNotify IO streams

---
 .../xtra4j/octetstream/CloseNotifyInputStream.java | 52 ++++++++++++++++++++
 .../octetstream/CloseNotifyOutputStream.java       | 55 ++++++++++++++++++++++
 2 files changed, 107 insertions(+)
 create mode 100644 xtra4j-misc/src/main/java/ch/hiddenalpha/xtra4j/octetstream/CloseNotifyInputStream.java
 create mode 100644 xtra4j-misc/src/main/java/ch/hiddenalpha/xtra4j/octetstream/CloseNotifyOutputStream.java

(limited to 'xtra4j-misc')

diff --git a/xtra4j-misc/src/main/java/ch/hiddenalpha/xtra4j/octetstream/CloseNotifyInputStream.java b/xtra4j-misc/src/main/java/ch/hiddenalpha/xtra4j/octetstream/CloseNotifyInputStream.java
new file mode 100644
index 0000000..6e75d61
--- /dev/null
+++ b/xtra4j-misc/src/main/java/ch/hiddenalpha/xtra4j/octetstream/CloseNotifyInputStream.java
@@ -0,0 +1,52 @@
+package ch.hiddenalpha.xtra4j.octetstream;
+
+import java.io.FilterInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+
+/** Allows to get notified when stream gets closed. */
+public class CloseNotifyInputStream extends FilterInputStream {
+
+    private final Runnable onClose;
+    private final AtomicBoolean isFired = new AtomicBoolean(false);
+
+    /**
+     * @param onClose
+     *      Called once, as soon stream has ended.
+     */
+    public CloseNotifyInputStream( InputStream src, Runnable onClose ){
+        super(src);
+        assert onClose != null : "Arg 'onClose' missing";
+        this.onClose = onClose;
+    }
+
+    @Override
+    public void close() throws IOException {
+        Exception byObserver = null, bySrc = null;
+        if( !isFired.getAndSet(true) ){
+            try{
+                in.close();
+            }catch( IOException | RuntimeException ex ){
+                bySrc = ex;
+            }
+            try{
+                onClose.run();
+            }catch( RuntimeException ex ){
+                byObserver = ex;
+            }
+            if( byObserver != null && bySrc != null && (byObserver != bySrc) ){
+                bySrc.addSuppressed(byObserver);
+            }else if( bySrc == null ){
+                bySrc = byObserver;
+            }
+            if( bySrc instanceof IOException ){
+                throw (IOException)bySrc;
+            }else if ( bySrc != null ){
+                throw (RuntimeException)bySrc;
+            }
+        }
+    }
+
+}
diff --git a/xtra4j-misc/src/main/java/ch/hiddenalpha/xtra4j/octetstream/CloseNotifyOutputStream.java b/xtra4j-misc/src/main/java/ch/hiddenalpha/xtra4j/octetstream/CloseNotifyOutputStream.java
new file mode 100644
index 0000000..3907442
--- /dev/null
+++ b/xtra4j-misc/src/main/java/ch/hiddenalpha/xtra4j/octetstream/CloseNotifyOutputStream.java
@@ -0,0 +1,55 @@
+package ch.hiddenalpha.xtra4j.octetstream;
+
+import java.io.FilterOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+
+/**
+ * Gives the chance to place a hook to get notified as soon the stream gets
+ * closed.
+ */
+public class CloseNotifyOutputStream extends FilterOutputStream {
+
+    private final Runnable onClose;
+    private final AtomicBoolean isFired = new AtomicBoolean(false);
+
+    /**
+     * @param onClose
+     *      Called once, as soon stream has ended.
+     */
+    public CloseNotifyOutputStream( OutputStream out, Runnable onClose ){
+        super(out);
+        assert onClose != null: "Arg 'onClose' missing";
+        this.onClose = onClose;
+    }
+
+    @Override
+    public void close() throws IOException {
+        Exception byObserver = null, bySrc = null;
+        if( !isFired.getAndSet(true) ){
+            try{
+                out.close();
+            }catch( IOException | RuntimeException ex ){
+                bySrc = ex;
+            }
+            try{
+                onClose.run();
+            }catch( RuntimeException ex ){
+                byObserver = ex;
+            }
+            if( byObserver != null && bySrc != null && (byObserver != bySrc) ){
+                bySrc.addSuppressed(byObserver);
+            }else if( bySrc == null ){
+                bySrc = byObserver;
+            }
+            if( bySrc instanceof IOException ){
+                throw (IOException)bySrc;
+            }else if ( bySrc != null ){
+                throw (RuntimeException)bySrc;
+            }
+        }
+    }
+
+}
-- 
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