diff options
Diffstat (limited to 'mojo/android/system/src/org/chromium/mojo/system/impl/HandleBase.java')
-rw-r--r-- | mojo/android/system/src/org/chromium/mojo/system/impl/HandleBase.java | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/mojo/android/system/src/org/chromium/mojo/system/impl/HandleBase.java b/mojo/android/system/src/org/chromium/mojo/system/impl/HandleBase.java new file mode 100644 index 0000000000..4d149a48d7 --- /dev/null +++ b/mojo/android/system/src/org/chromium/mojo/system/impl/HandleBase.java @@ -0,0 +1,140 @@ +// Copyright 2014 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 android.util.Log; + +import org.chromium.mojo.system.Core; +import org.chromium.mojo.system.Core.HandleSignalsState; +import org.chromium.mojo.system.Handle; +import org.chromium.mojo.system.UntypedHandle; + +/** + * Implementation of {@link Handle}. + */ +abstract class HandleBase implements Handle { + + private static final String TAG = "HandleImpl"; + + /** + * The pointer to the scoped handle owned by this object. + */ + private int mMojoHandle; + + /** + * The core implementation. Will be used to delegate all behavior. + */ + protected CoreImpl mCore; + + /** + * Base constructor. Takes ownership of the passed handle. + */ + HandleBase(CoreImpl core, int mojoHandle) { + mCore = core; + mMojoHandle = mojoHandle; + } + + /** + * Constructor for transforming {@link HandleBase} into a specific one. It is used to transform + * an {@link UntypedHandle} into a typed one, or any handle into an {@link UntypedHandle}. + */ + protected HandleBase(HandleBase other) { + mCore = other.mCore; + HandleBase otherAsHandleImpl = other; + int mojoHandle = otherAsHandleImpl.mMojoHandle; + otherAsHandleImpl.mMojoHandle = CoreImpl.INVALID_HANDLE; + mMojoHandle = mojoHandle; + } + + /** + * @see org.chromium.mojo.system.Handle#close() + */ + @Override + public void close() { + if (mMojoHandle != CoreImpl.INVALID_HANDLE) { + // After a close, the handle is invalid whether the close succeed or not. + int handle = mMojoHandle; + mMojoHandle = CoreImpl.INVALID_HANDLE; + mCore.close(handle); + } + } + + /** + * @see org.chromium.mojo.system.Handle#querySignalsState() + */ + @Override + public HandleSignalsState querySignalsState() { + return mCore.queryHandleSignalsState(mMojoHandle); + } + + /** + * @see org.chromium.mojo.system.Handle#isValid() + */ + @Override + public boolean isValid() { + return mMojoHandle != CoreImpl.INVALID_HANDLE; + } + + /** + * @see org.chromium.mojo.system.Handle#toUntypedHandle() + */ + @Override + public UntypedHandle toUntypedHandle() { + return new UntypedHandleImpl(this); + } + + /** + * @see org.chromium.mojo.system.Handle#getCore() + */ + @Override + public Core getCore() { + return mCore; + } + + /** + * @see Handle#releaseNativeHandle() + */ + @Override + public int releaseNativeHandle() { + int result = mMojoHandle; + mMojoHandle = CoreImpl.INVALID_HANDLE; + return result; + } + + /** + * Getter for the native scoped handle. + * + * @return the native scoped handle. + */ + int getMojoHandle() { + return mMojoHandle; + } + + /** + * invalidate the handle. The caller must ensures that the handle does not leak. + */ + void invalidateHandle() { + mMojoHandle = CoreImpl.INVALID_HANDLE; + } + + /** + * Close the handle if it is valid. Necessary because we cannot let handle leak, and we cannot + * ensure that every handle will be manually closed. + * + * @see java.lang.Object#finalize() + */ + @Override + protected final void finalize() throws Throwable { + if (isValid()) { + // This should not happen, as the user of this class should close the handle. Adding a + // warning. + Log.w(TAG, "Handle was not closed."); + // Ignore result at this point. + mCore.closeWithResult(mMojoHandle); + } + super.finalize(); + } + +} |