com.sun.grizzly.SingleProtocolChainInstanceHandler Maven / Gradle / Ivy
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package com.sun.grizzly;
/**
* Implementation of an {@link ProtocolChainInstanceHandler}.
* Contains single {@link ProtocolChain} instance, which will be returned all
* the time {@link ProtocolChainInstanceHandler#poll()} will be called.
*
* @author Jeanfrancois Arcand
*/
public class SingleProtocolChainInstanceHandler
implements ProtocolChainInstanceHandler{
/**
* Single {@link ProtocolChain} instance.
*/
protected volatile ProtocolChain protocolChain;
public SingleProtocolChainInstanceHandler() {
this(null);
}
public SingleProtocolChainInstanceHandler(ProtocolChain protocolChain) {
this.protocolChain = protocolChain;
}
/**
* Return a {@link ProtocolChain} instance. If no {@link ProtocolChain} was
* set before, then new instance of {@link DefaultProtocolChain}
* will be returned.
*
* @return ProtocolChain
*/
public ProtocolChain poll() {
if (protocolChain == null) {
synchronized(this) {
if (protocolChain == null) {
protocolChain = new DefaultProtocolChain();
}
}
}
return protocolChain;
}
/**
* Offer (add) an instance of ProtocolChain to this instance pool.
* {@link StatelessProtocolChainInstanceHandler} has empty implementation
* of the method.
*
* @param protocolChain - ProtocolChain to offer / add to the pool
* @return boolean, true is always returned.
*/
public boolean offer(ProtocolChain protocolChain) {
if (this.protocolChain != protocolChain) {
throw new IllegalArgumentException("Passed protocolChain argument " +
"doesn't correspond to one, holding by this handler instance");
}
return true;
}
/**
* Get the stateless {@link ProtocolChain} instance, which is always
* returned via {@link StatelessProtocolChainInstanceHandler#poll()}.
*
* @return the stateless {@link ProtocolChain} instance, which is always
* returned via {@link StatelessProtocolChainInstanceHandler#poll()}.
*/
public ProtocolChain getProtocolChain() {
return protocolChain;
}
/**
* Set the stateless {@link ProtocolChain} instance, which will be always
* returned via {@link StatelessProtocolChainInstanceHandler#poll()}.
*
* @param protocolChain the stateless {@link ProtocolChain} instance,
* which will be always returned via
* {@link StatelessProtocolChainInstanceHandler#poll()}.
*/
public void setProtocolChain(ProtocolChain protocolChain) {
this.protocolChain = protocolChain;
}
}