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com.oracle.libuv.IdleHandle Maven / Gradle / Ivy
/*
* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.oracle.libuv;
/**
* Idle handles will run the given callback once per loop
* iteration, right before the {@link PrepareCallback} handles.
*
* See Idle handle
*/
public class IdleHandle extends Handle {
private boolean closed;
private IdleCallback onIdle;
private CloseCallback onClose;
static {
_static_initialize();
}
/**
* Attach a {@link IdleCallback}.
*
* @param callback A Callback, which will be invoked once per loop
* iteration, right before the {@link PrepareCallback}
* handles.
*/
public void setIdleCallback(final IdleCallback callback) {
if (onIdle != null) {
throw new IllegalStateException();
}
onIdle = callback;
}
/**
* Attach a {@link CloseCallback}.
*
* @param callback A Callback, which will be invoked when check handle is
* closed.
*
* @throws IllegalStateException if this method called more than once.
*/
public void setCloseCallback(final CloseCallback callback) {
if (onClose != null) {
throw new IllegalStateException();
}
onClose = callback;
}
IdleHandle(final LoopHandle loop) {
super(_new(loop.pointer()), loop);
_initialize(pointer);
}
/**
* Starts the idle handle with the callback specified
* {@link #setIdleCallback(IdleCallback)}.
*
* @return {@code 0} on success, or an error {@code code < 0} on failure.
*/
public int start() {
return _start(pointer);
}
/**
* Stop the handle, the callback will no longer be called.
*
* @return {@code 0} on success, or an error {@code code < 0} on failure.
*/
public int stop() {
return _stop(pointer);
}
/**
* Close the handle and free up any resources that may be held by it.
*
* @return {@code 0} on success, or an error {@code code < 0} on failure.
*/
public void close() {
if (!closed) {
_close(pointer);
}
closed = true;
}
// ------------------------------------------------------------------------
// ~ Private
// ------------------------------------------------------------------------
private void callback(final int type,
final int status) {
switch (type) {
case 1:
if (onIdle != null) {
loop.getCallbackHandler().handleIdleCallback(onIdle, status);
}
break;
case 2:
if (onClose != null) {
loop.getCallbackHandler().handleIdleCallback(onClose, status);
}
break;
default:
assert false : "unsupported callback type " + type;
}
}
// ------------------------------------------------------------------------
// ~ Native
// ------------------------------------------------------------------------
private static native long _new(final long loop);
private static native void _static_initialize();
private native void _initialize(final long ptr);
private native int _start(final long ptr);
private native int _stop(final long ptr);
private native void _close(final long ptr);
}