/**@class android.os.IBinder Base interface for a remotable object, the core part of a lightweight remote procedure call mechanism designed for high performance when performing in-process and cross-process calls. This interface describes the abstract protocol for interacting with a remotable object. Do not implement this interface directly, instead extend from {@link android.os.Binder}. <p>The key IBinder API is {@link #transact transact()} matched by {@link android.os.Binder#onTransact android.os.Binder.onTransact()}. These methods allow you to send a call to an IBinder object and receive a call coming in to a Binder object, respectively. This transaction API is synchronous, such that a call to {@link #transact transact()} does not return until the target has returned from {@link android.os.Binder#onTransact android.os.Binder.onTransact()}; this is the expected behavior when calling an object that exists in the local process, and the underlying inter-process communication (IPC) mechanism ensures that these same semantics apply when going across processes. <p>The data sent through transact() is a {@link android.os.Parcel}, a generic buffer of data that also maintains some meta-data about its contents. The meta data is used to manage IBinder object references in the buffer, so that those references can be maintained as the buffer moves across processes. This mechanism ensures that when an IBinder is written into a Parcel and sent to another process, if that other process sends a reference to that same IBinder back to the original process, then the original process will receive the same IBinder object back. These semantics allow IBinder/Binder objects to be used as a unique identity (to serve as a token or for other purposes) that can be managed across processes. <p>The system maintains a pool of transaction threads in each process that it runs in. These threads are used to dispatch all IPCs coming in from other processes. For example, when an IPC is made from process A to process B, the calling thread in A blocks in transact() as it sends the transaction to process B. The next available pool thread in B receives the incoming transaction, calls Binder.onTransact() on the target object, and replies with the result Parcel. Upon receiving its result, the thread in process A returns to allow its execution to continue. In effect, other processes appear to use as additional threads that you did not create executing in your own process. <p>The Binder system also supports recursion across processes. For example if process A performs a transaction to process B, and process B while handling that transaction calls transact() on an IBinder that is implemented in A, then the thread in A that is currently waiting for the original transaction to finish will take care of calling Binder.onTransact() on the object being called by B. This ensures that the recursion semantics when calling remote binder object are the same as when calling local objects. <p>When working with remote objects, you often want to find out when they are no longer valid. There are three ways this can be determined: <ul> <li> The {@link #transact transact()} method will throw a {@link android.os.RemoteException} exception if you try to call it on an IBinder whose process no longer exists. <li> The {@link #pingBinder}() method can be called, and will return false if the remote process no longer exists. <li> The {@link #linkToDeath linkToDeath()} method can be used to register a {@link android.os.IBinder.DeathRecipient} with the IBinder, which will be called when its containing process goes away. </ul> @see Binder */ var IBinder = { /** The first transaction code available for user commands. */ FIRST_CALL_TRANSACTION : "1", /** The last transaction code available for user commands. */ LAST_CALL_TRANSACTION : "16777215", /** IBinder protocol transaction code: pingBinder(). */ PING_TRANSACTION : "1599098439", /** IBinder protocol transaction code: dump internal state. */ DUMP_TRANSACTION : "1598311760", /** IBinder protocol transaction code: execute a shell command. @hide */ SHELL_COMMAND_TRANSACTION : "1598246212", /** IBinder protocol transaction code: interrogate the recipient side of the transaction for its canonical interface descriptor. */ INTERFACE_TRANSACTION : "1598968902", /** IBinder protocol transaction code: send a tweet to the target object. The data in the parcel is intended to be delivered to a shared messaging service associated with the object; it can be anything, as long as it is not more than 130 UTF-8 characters to conservatively fit within common messaging services. As part of {@link android.os.Build.VERSION_CODES#HONEYCOMB_MR2}, all Binder objects are expected to support this protocol for fully integrated tweeting across the platform. To support older code, the default implementation logs the tweet to the main log as a simple emulation of broadcasting it publicly over the Internet. <p>Also, upon completing the dispatch, the object must make a cup of tea, return it to the caller, and exclaim "jolly good message old boy!". */ TWEET_TRANSACTION : "1599362900", /** IBinder protocol transaction code: tell an app asynchronously that the caller likes it. The app is responsible for incrementing and maintaining its own like counter, and may display this value to the user to indicate the quality of the app. This is an optional command that applications do not need to handle, so the default implementation is to do nothing. <p>There is no response returned and nothing about the system will be functionally affected by it, but it will improve the app's self-esteem. */ LIKE_TRANSACTION : "1598835019", /**@hide */ SYSPROPS_TRANSACTION : "1599295570", /** Flag to {@link #transact}: this is a one-way call, meaning that the caller returns immediately, without waiting for a result from the callee. Applies only if the caller and callee are in different processes. <p>The system provides special ordering semantics for multiple oneway calls being made to the same IBinder object: these calls will be dispatched in the other process one at a time, with the same order as the original calls. These are still dispatched by the IPC thread pool, so may execute on different threads, but the next one will not be dispatched until the previous one completes. This ordering is not guaranteed for calls on different IBinder objects or when mixing oneway and non-oneway calls on the same IBinder object.</p> */ FLAG_ONEWAY : "1", /** Limit that should be placed on IPC sizes to keep them safely under the transaction buffer limit. @hide */ MAX_IPC_SIZE : "65536", /**Get the canonical name of the interface supported by this binder. */ getInterfaceDescriptor : function( ) {}, /**Check to see if the object still exists. @return {Boolean} Returns false if the hosting process is gone, otherwise the result (always by default true) returned by the pingBinder() implementation on the other side. */ pingBinder : function( ) {}, /**Check to see if the process that the binder is in is still alive. @return {Boolean} false if the process is not alive. Note that if it returns true, the process may have died while the call is returning. */ isBinderAlive : function( ) {}, /**Attempt to retrieve a local implementation of an interface for this Binder object. If null is returned, you will need to instantiate a proxy class to marshall calls through the transact() method. */ queryLocalInterface : function( ) {}, /**Print the object's state into the given stream. @param {Object {FileDescriptor}} fd The raw file descriptor that the dump is being sent to. @param {Object {java.lang.String[]}} args additional arguments to the dump request. */ dump : function( ) {}, /**Like {@link #dump(FileDescriptor, String[])} but always executes asynchronously. If the object is local, a new thread is created to perform the dump. @param {Object {FileDescriptor}} fd The raw file descriptor that the dump is being sent to. @param {Object {java.lang.String[]}} args additional arguments to the dump request. */ dumpAsync : function( ) {}, /**Execute a shell command on this object. This may be performed asynchrously from the caller; the implementation must always call resultReceiver when finished. @param {Object {FileDescriptor}} in The raw file descriptor that an input data stream can be read from. @param {Object {FileDescriptor}} out The raw file descriptor that normal command messages should be written to. @param {Object {FileDescriptor}} err The raw file descriptor that command error messages should be written to. @param {Object {java.lang.String[]}} args Command-line arguments. @param {Object {ShellCallback}} shellCallback Optional callback to the caller's shell to perform operations in it. @param {Object {ResultReceiver}} resultReceiver Called when the command has finished executing, with the result code. @hide */ shellCommand : function( ) {}, /**Perform a generic operation with the object. @param {Number} code The action to perform. This should be a number between {@link #FIRST_CALL_TRANSACTION} and {@link #LAST_CALL_TRANSACTION}. @param {Object {Parcel}} data Marshalled data to send to the target. Must not be null. If you are not sending any data, you must create an empty Parcel that is given here. @param {Object {Parcel}} reply Marshalled data to be received from the target. May be null if you are not interested in the return value. @param {Number} flags Additional operation flags. Either 0 for a normal RPC, or {@link #FLAG_ONEWAY} for a one-way RPC. @return {Boolean} Returns the result from {@link Binder#onTransact}. A successful call generally returns true; false generally means the transaction code was not understood. */ transact : function( ) {}, /**Register the recipient for a notification if this binder goes away. If this binder object unexpectedly goes away (typically because its hosting process has been killed), then the given {@link android.os.IBinder.DeathRecipient}'s {@link android.os.IBinder.DeathRecipient#binderDied android.os.IBinder.DeathRecipient.binderDied()} method will be called. <p>You will only receive death notifications for remote binders, as local binders by definition can't die without you dying as well. @throws RemoteException if the target IBinder's process has already died. @see #unlinkToDeath */ linkToDeath : function( ) {}, /**Remove a previously registered death notification. The recipient will no longer be called if this object dies. @return {Boolean} {@code true} if the <var>recipient</var> is successfully unlinked, assuring you that its {@link DeathRecipient#binderDied DeathRecipient.binderDied()} method will not be called; {@code false} if the target IBinder has already died, meaning the method has been (or soon will be) called. @throws java.util.NoSuchElementException if the given <var>recipient</var> has not been registered with the IBinder, and the IBinder is still alive. Note that if the <var>recipient</var> was never registered, but the IBinder has already died, then this exception will <em>not</em> be thrown, and you will receive a false return value instead. */ unlinkToDeath : function( ) {}, };