ResourceLifeCycle.java

package ioio.lib.impl;

import ioio.lib.api.Closeable;
import ioio.lib.api.exception.ConnectionLostException;
import ioio.lib.impl.IncomingState.DisconnectListener;

public class ResourceLifeCycle implements Closeable, DisconnectListener {

    protected enum State {
        OPEN, CLOSED, DISCONNECTED
    }

    private State state_ = State.OPEN;

    public ResourceLifeCycle() {
        super();
    }

    @Override
    public synchronized void disconnected() {
        if (state_ != State.CLOSED) {
            state_ = State.DISCONNECTED;
            notifyAll();
        }
    }

    @Override
    public synchronized void close() {
        checkClose();
        state_ = State.CLOSED;
        notifyAll();
    }

    protected synchronized void checkClose() {
        if (state_ == State.CLOSED) {
            throw new IllegalStateException("Trying to close a closed resouce");
        }
    }

    protected synchronized void checkState() throws ConnectionLostException {
        if (state_ == State.CLOSED) {
            throw new IllegalStateException("Trying to use a closed resouce");
        } else if (state_ == State.DISCONNECTED) {
            throw new ConnectionLostException();
        }
    }

    protected synchronized void safeWait() throws ConnectionLostException, InterruptedException {
        if (state_ == State.CLOSED) {
            throw new InterruptedException("Resource closed");
        } else if (state_ == State.DISCONNECTED) {
            throw new ConnectionLostException();
        }
        wait();
    }

}