AbstractCluster.java example

Explorer
zstack-master
package org.zstack.compute.cluster;

import org.zstack.core.Platform;
import org.zstack.core.statemachine.StateMachine;
import org.zstack.header.cluster.Cluster;
import org.zstack.header.cluster.ClusterState;
import org.zstack.header.cluster.ClusterStateEvent;

public abstract class AbstractCluster implements Cluster {
	private final static StateMachine<ClusterState, ClusterStateEvent> stateMachine;
	
	static {
		stateMachine = Platform.<ClusterState, ClusterStateEvent> createStateMachine();
		stateMachine.addTranscation(ClusterState.Enabled, ClusterStateEvent.disable, ClusterState.Disabled);
		stateMachine.addTranscation(ClusterState.Enabled, ClusterStateEvent.enable, ClusterState.Enabled);
		stateMachine.addTranscation(ClusterState.Disabled, ClusterStateEvent.disable, ClusterState.Disabled);
		stateMachine.addTranscation(ClusterState.Disabled, ClusterStateEvent.enable, ClusterState.Enabled);
	}
	
	static ClusterState getNextState(ClusterState curr, ClusterStateEvent event) {
		return stateMachine.getNextState(curr, event);
	}

    protected abstract void deleteHook();
}