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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package org.chromium.mojo.system.impl;
import org.chromium.base.annotations.CalledByNative;
import org.chromium.base.annotations.JNINamespace;
import org.chromium.mojo.system.Core;
import org.chromium.mojo.system.Handle;
import org.chromium.mojo.system.MojoResult;
import org.chromium.mojo.system.Watcher;
@JNINamespace("mojo::android")
class WatcherImpl implements Watcher {
private long mImplPtr = nativeCreateWatcher();
private Callback mCallback;
@Override
public int start(Handle handle, Core.HandleSignals signals, Callback callback) {
if (mImplPtr == 0) {
return MojoResult.INVALID_ARGUMENT;
}
if (!(handle instanceof HandleBase)) {
return MojoResult.INVALID_ARGUMENT;
}
int result =
nativeStart(mImplPtr, ((HandleBase) handle).getMojoHandle(), signals.getFlags());
if (result == MojoResult.OK) mCallback = callback;
return result;
}
@Override
public void cancel() {
if (mImplPtr == 0) {
return;
}
mCallback = null;
nativeCancel(mImplPtr);
}
@Override
public void destroy() {
if (mImplPtr == 0) {
return;
}
nativeDelete(mImplPtr);
mImplPtr = 0;
}
@CalledByNative
private void onHandleReady(int result) {
mCallback.onResult(result);
}
private native long nativeCreateWatcher();
private native int nativeStart(long implPtr, int mojoHandle, int flags);
private native void nativeCancel(long implPtr);
private native void nativeDelete(long implPtr);
}
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