Merge pull request pires#116 from valens254/master

pires · pires · commit 7a6bfff8564a · 2016-06-07T10:47:08.000+01:00
Only one command can write and read a data in one time.
diff --git a/src/main/java/com/github/pires/obd/commands/ObdCommand.java b/src/main/java/com/github/pires/obd/commands/ObdCommand.java
@@ -72,10 +72,12 @@ public ObdCommand(ObdCommand other) {
      */
     public void run(InputStream in, OutputStream out) throws IOException,
             InterruptedException {
-        start = System.currentTimeMillis();
-        sendCommand(out);
-        readResult(in);
-        end = System.currentTimeMillis();
+        synchronized (ObdCommand.class) {//Only one command can write and read a data in one time.
+            start = System.currentTimeMillis();
+            sendCommand(out);
+            readResult(in);
+            end = System.currentTimeMillis();
+        }
     }
 
     /**
@@ -351,4 +353,19 @@ public final String getCommandPID() {
         return cmd.substring(3);
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        ObdCommand that = (ObdCommand) o;
+
+        return cmd != null ? cmd.equals(that.cmd) : that.cmd == null;
+    }
+
+    @Override
+    public int hashCode() {
+        return cmd != null ? cmd.hashCode() : 0;
+    }
+
 }
