Java API for mojo system.

mojo/public/java/src/org/chromium/mojo/system/Core.java

Index: mojo/public/java/src/org/chromium/mojo/system/Core.java
diff --git a/mojo/public/java/src/org/chromium/mojo/system/Core.java b/mojo/public/java/src/org/chromium/mojo/system/Core.java
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+// 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;
+
+import java.util.List;
+
+/**
+ * Core mojo interface giving access to the base operations. See |src/mojo/public/c/system/core.h|
+ * for the underlying api.
+ */
+public interface Core {
+
+    /**
+     * Used to indicate an infinite deadline (timeout).
+     */
+    public static final long DEADLINE_INFINITE = -1;
+
+    /**
+     * Flags for the wait operations on handles.
+     */
+    public static class WaitFlags extends Flags<WaitFlags> {
+        /**
+         * Constructor.
+         *
+         * @param flags the serialized flags.
+         */
+        private WaitFlags(int flags) {
+            super(flags);
+        }
+
+        private static final int FLAG_NONE = 0;
+        private static final int FLAG_READABLE = 1 << 0;
+        private static final int FLAG_WRITABLE = 1 << 1;
+        private static final int FLAG_ALL = ~0;
+
+        /**
+         * Change the readable bit of this flag.
+         *
+         * @param readable the new value of the readable bit.
+         * @return this.
+         */
+        public WaitFlags setReadable(boolean readable) {
+            return setFlag(FLAG_READABLE, readable);
+        }
+
+        /**
+         * Change the writable bit of this flag.
+         *
+         * @param writable the new value of the writable bit.
+         * @return this.
+         */
+        public WaitFlags setWritable(boolean writable) {
+            return setFlag(FLAG_WRITABLE, writable);
+        }
+
+        /**
+         * @return a flag with no bit set.
+         */
+        public static WaitFlags none() {
+            return new WaitFlags(FLAG_NONE);
+        }
+
+        /**
+         * @return a flag with all bits set.
+         */
+        public static WaitFlags all() {
+            return new WaitFlags(FLAG_ALL);
+        }
+    }
+
+    /**
+     * @return a platform-dependent monotonically increasing tick count representing "right now."
+     */
+    public long getTimeTicksNow();
+
+    /**
+     * Waits on the given |handle| until the state indicated by |flags| is satisfied or until
+     * |deadline| has passed.
+     *
+     * @return |MojoResult.OK| if some flag in |flags| was satisfied (or is already satisfied).
+     *         <p>
+     *         |MojoResult.DEADLINE_EXCEEDED| if the deadline has passed without any of the flags
+     *         begin satisfied.
+     *         <p>
+     *         |MojoResult.CANCELLED| if |handle| is closed concurrently by another thread.
+     *         <p>
+     *         |MojoResult.FAILED_PRECONDITION| if it is or becomes impossible that any flag in
+     *         |flags| will ever be satisfied (for example, if the other endpoint is close).
+     */
+    public int wait(Handle handle, WaitFlags flags, long deadline);
+
+    /**
+     * Result for the |waitMany| method.
+     */
+    public static class WaitManyResult {
+
+        /**
+         * See |wait| for the different possible values.
+         */
+        private int mMojoResult;
+        /**
+         * If |mojoResult| is |MojoResult.OK|, |handleIndex| is the index of the handle for which
+         * some flag was satisfied (or is already satisfied). If |mojoResult| is
+         * |MojoResult.CANCELLED| or |MojoResult.FAILED_PRECONDITION|, |handleIndex| is the index of
+         * the handle for which the issue occurred.
+         */
+        private int mHandleIndex;
+
+        /**
+         * @return the mojoResult
+         */
+        public int getMojoResult() {
+            return mMojoResult;
+        }
+
+        /**
+         * @param mojoResult the mojoResult to set
+         */
+        public void setMojoResult(int mojoResult) {
+            mMojoResult = mojoResult;
+        }
+
+        /**
+         * @return the handleIndex
+         */
+        public int getHandleIndex() {
+            return mHandleIndex;
+        }
+
+        /**
+         * @param handleIndex the handleIndex to set
+         */
+        public void setHandleIndex(int handleIndex) {
+            mHandleIndex = handleIndex;
+        }
+    }
+
+    /**
+     * Waits on handle in |handles| for at least one of them to satisfy the associated |WaitFlags|,
+     * or until |deadline| has passed.
+     *
+     * @returns a |WaitManyResult|.
+     */
+    public WaitManyResult waitMany(List<Pair<Handle, WaitFlags>> handles, long deadline);
+
+    /**
+     * Creates a message pipe, which is a bidirectional communication channel for framed data (i.e.,
+     * messages). Messages can contain plain data and/or Mojo handles.
+     *
+     * @return the set of handles for the two endpoints (ports) of the message pipe.
+     */
+    public Pair<MessagePipeHandle, MessagePipeHandle> createMessagePipe();
+
+    /**
+     * Creates a data pipe, which is a unidirectional communication channel for unframed data, with
+     * the given options. Data is unframed, but must come as (multiples of) discrete elements, of
+     * the size given in |options|. See |DataPipe.CreateOptions| for a description of the different
+     * options available for data pipes. |options| may be set to null for a data pipe with the
+     * default options (which will have an element size of one byte and have some system-dependent
+     * capacity).
+     *
+     * @return the set of handles for the two endpoints of the data pipe.
+     */
+    public Pair<DataPipe.ProducerHandle, DataPipe.ConsumerHandle> createDataPipe(
+            DataPipe.CreateOptions options);
+
+    /**
+     * Creates a buffer that can be shared between applications (by duplicating the handle -- see
+     * |SharedBufferHandle.duplicate()| -- and passing it over a message pipe). To access the
+     * buffer, one must call |SharedBufferHandle.map|.
+     *
+     * @return the new |SharedBufferHandle|.
+     */
+    public SharedBufferHandle createSharedBuffer(SharedBufferHandle.CreateOptions options,
+            long numBytes);
+}