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I'm trying to learn Socket by myself. I'm little bit confused by following text from Oracle website. I have some questions regarding that. Thanks in advance for any clear explanation.
setSoTimeout
public void setSoTimeout(int timeout) throws SocketException
Enable/disable SO_TIMEOUT with the specified timeout, in milliseconds. With this option set to a non-zero timeout, a
read()call on theInputStreamassociated with this Socket will block for only this amount of time. If the timeout expires, ajava.net.SocketTimeoutExceptionis raised, though the Socket is still valid. The option must be enabled prior to entering the blocking operation to have effect. The timeout must be > 0. A timeout of zero is interpreted as an infinite timeout.
Socket is the endpoint of a connection. If I say
mySocket.setSoTimeout(2000); Does it mean that I'm blocking reading any input from the Server/Client for this socket for 2000 millisecond and after this time the socket is ready to read data?
What does it mean timeout expire?
What is the option which must be enabled prior to blocking operation?
Infinite Timeout means that the socket does't read anymore?
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The setSoTimeout () method of Java Socket class enables or disables the SO_TIMEOUT option with the given timeout value, in milliseconds. The timeout value should be greater than 0 otherwise, it will throw an error.
Using try/catch/finally If you are a developer, so you can surround the socket connection part of your code in a try/catch/finally and handle the error in the catch. You might try connecting a second time, or try connecting to another possible socket, or simply exit the program cleanly.
timeout - The socket timeout value passed to the Socket. setSoTimeout() method. The default on the client side is 1800000 milliseconds (30 minutes).
Does it mean that I'm blocking reading any input from the Server/Client for this socket for 2000 millisecond and after this time the socket is ready to read data?
No, it means that if no data arrives within 2000ms a SocketTimeoutException will be thrown.
What does it mean timeout expire?
It means the 2000ms (in your case) elapses without any data arriving.
What is the option which must be enabled prior to blocking operation?
There isn't one that 'must be' enabled. If you mean 'may be enabled', this is one of them.
Infinite Timeout menas that the socket does't read anymore?
What a strange suggestion. It means that if no data ever arrives you will block in the read forever.
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The JavaDoc explains it very well:
With this option set to a non-zero timeout, a read() call on the InputStream associated with this Socket will block for only this amount of time. If the timeout expires, a java.net.SocketTimeoutException is raised, though the Socket is still valid. The option must be enabled prior to entering the blocking operation to have effect. The timeout must be > 0. A timeout of zero is interpreted as an infinite timeout.
SO_TIMEOUT is the timeout that a read() call will block. If the timeout is reached, a java.net.SocketTimeoutException will be thrown. If you want to block forever put this option to zero (the default value), then the read() call will block until at least 1 byte could be read.
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