am 595c4092: am 8fb0faf3: Merge change I0a56959e into eclair-mr2 (7a4fb737) · Commits · e / os / android_frameworks_base

core/java/android/os/HandlerState.java

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		/*
		* Copyright (C) 2006 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		package android.os;

		/**
		* {@hide}
		*/
		public abstract class HandlerState {
		public HandlerState() {
		}

		public void enter(Message message) {
		}

		public abstract void processMessage(Message message);

		public void exit(Message message) {
		}
		}

core/java/android/os/HandlerStateMachine.java

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		/*
		* Copyright (C) 2006 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		package android.os;

		import android.util.Log;
		import android.util.LogPrinter;

		/**
		* {@hide}
		*
		* Implement a state machine where each state is an object,
		* HandlerState. Each HandlerState must implement processMessage
		* and optionally enter/exit. When a state machine is created
		* the initial state must be set. When messages are sent to
		* a state machine the current state's processMessage method is
		* invoked. If this is the first message for this state the
		* enter method is called prior to processMessage and when
		* transtionTo is invoked the state's exit method will be
		* called after returning from processMessage.
		*
		* If a message should be handled in a different state the
		* processMessage method may call deferMessage. This causes
		* the message to be saved on a list until transitioning
		* to a new state, at which time all of the deferred messages
		* will be put on the front of the state machines queue and
		* processed by the new current state's processMessage
		* method.
		*
		* Below is an example state machine with two state's, S1 and S2.
		* The initial state is S1 which defers all messages and only
		* transition to S2 when message.what == TEST_WHAT_2. State S2
		* will process each messages until it receives TEST_WHAT_2
		* where it will transition back to S1:
		<code>
		class StateMachine1 extends HandlerStateMachine {
		private static final int TEST_WHAT_1 = 1;
		private static final int TEST_WHAT_2 = 2;

		StateMachine1(String name) {
		super(name);
		setInitialState(mS1);
		}

		class S1 extends HandlerState {
		&#064;Override public void enter(Message message) {
		}

		&#064;Override public void processMessage(Message message) {
		deferMessage(message);
		if (message.what == TEST_WHAT_2) {
		transitionTo(mS2);
		}
		}

		&#064;Override public void exit(Message message) {
		}
		}

		class S2 extends HandlerState {
		&#064;Override public void processMessage(Message message) {
		// Do some processing
		if (message.what == TEST_WHAT_2) {
		transtionTo(mS1);
		}
		}
		}

		private S1 mS1 = new S1();
		private S2 mS2 = new S2();
		}
		</code>
		*/
		public class HandlerStateMachine {

		private boolean mDbg = false;
		private static final String TAG = "HandlerStateMachine";
		private String mName;
		private SmHandler mHandler;
		private HandlerThread mHandlerThread;

		/**
		* Handle messages sent to the state machine by calling
		* the current state's processMessage. It also handles
		* the enter/exit calls and placing any deferred messages
		* back onto the queue when transitioning to a new state.
		*/
		class SmHandler extends Handler {

		SmHandler(Looper looper) {
		super(looper);
		}

		/**
		* This will dispatch the message to the
		* current state's processMessage.
		*/
		@Override
		final public void handleMessage(Message msg) {
		if (mDbg) Log.d(TAG, "SmHandler.handleMessage E");
		if (mDestState != null) {
		if (mDbg) Log.d(TAG, "SmHandler.handleMessage; new destation call enter");
		mCurrentState = mDestState;
		mDestState = null;
		mCurrentState.enter(msg);
		}
		if (mCurrentState != null) {
		if (mDbg) Log.d(TAG, "SmHandler.handleMessage; call processMessage");
		mCurrentState.processMessage(msg);
		} else {
		/* Strange no state to execute */
		Log.e(TAG, "handleMessage: no current state, did you call setInitialState");
		}

		if (mDestState != null) {
		if (mDbg) Log.d(TAG, "SmHandler.handleMessage; new destination call exit");
		mCurrentState.exit(msg);

		/**
		* Place the messages from the deferred queue:t
		* on to the Handler's message queue in the
		* same order that they originally arrived.
		*
		* We set cur.when = 0 to circumvent the check
		* that this message has already been sent.
		*/
		while (mDeferredMessages != null) {
		Message cur = mDeferredMessages;
		mDeferredMessages = mDeferredMessages.next;
		cur.when = 0;
		if (mDbg) Log.d(TAG, "SmHandler.handleMessage; queue deferred message what="
		+ cur.what + " target=" + cur.target);
		sendMessageAtFrontOfQueue(cur);
		}
		if (mDbg) Log.d(TAG, "SmHandler.handleMessage X");
		}
		}

		public HandlerState mCurrentState;
		public HandlerState mDestState;
		public Message mDeferredMessages;
		}

		/**
		* Create an active StateMachine, one that has a
		* dedicated thread/looper/queue.
		*/
		public HandlerStateMachine(String name) {
		mName = name;
		mHandlerThread = new HandlerThread(name);
		mHandlerThread.start();
		mHandler = new SmHandler(mHandlerThread.getLooper());
		}

		/**
		* Get a message and set Message.target = this.
		*/
		public final Message obtainMessage()
		{
		Message msg = Message.obtain(mHandler);
		if (mDbg) Log.d(TAG, "StateMachine.obtainMessage() EX target=" + msg.target);
		return msg;
		}

		/**
		* Get a message and set Message.target = this and
		* Message.what = what.
		*/
		public final Message obtainMessage(int what) {
		Message msg = Message.obtain(mHandler, what);
		if (mDbg) {
		Log.d(TAG, "StateMachine.obtainMessage(what) EX what=" + msg.what +
		" target=" + msg.target);
		}
		return msg;
		}

		/**
		* Enqueue a message to this state machine.
		*/
		public final void sendMessage(Message msg) {
		if (mDbg) Log.d(TAG, "StateMachine.sendMessage EX msg.what=" + msg.what);
		mHandler.sendMessage(msg);
		}

		/**
		* Enqueue a message to this state machine after a delay.
		*/
		public final void sendMessageDelayed(Message msg, long delayMillis) {
		if (mDbg) {
		Log.d(TAG, "StateMachine.sendMessageDelayed EX msg.what="
		+ msg.what + " delay=" + delayMillis);
		}
		mHandler.sendMessageDelayed(msg, delayMillis);
		}

		/**
		* Set the initial state. This must be invoked before
		* and messages are sent to the state machine.
		*/
		public void setInitialState(HandlerState initialState) {
		if (mDbg) {
		Log.d(TAG, "StateMachine.setInitialState EX initialState"
		+ initialState.getClass().getName());
		}
		mHandler.mDestState = initialState;
		}

		/**
		* transition to destination state. Upon returning
		* from processMessage the current state's exit will
		* be executed and upon the next message arriving
		* destState.enter will be invoked.
		*/
		final public void transitionTo(HandlerState destState) {
		if (mDbg) {
		Log.d(TAG, "StateMachine.transitionTo EX destState"
		+ destState.getClass().getName());
		}
		mHandler.mDestState = destState;
		}

		/**
		* Defer this message until next state transition.
		* Upon transitioning all deferred messages will be
		* placed on the queue and reprocessed in the original
		* order. (i.e. The next state the oldest messages will
		* be processed first)
		*/
		final public void deferMessage(Message msg) {
		if (mDbg) {
		Log.d(TAG, "StateMachine.deferMessage EX mDeferredMessages="
		+ mHandler.mDeferredMessages);
		}

		/* Copy the "msg" to "newMsg" as "msg" will be recycled */
		Message newMsg = obtainMessage();
		newMsg.copyFrom(msg);

		/* Place on front of queue */
		newMsg.next = mHandler.mDeferredMessages;
		mHandler.mDeferredMessages = newMsg;
		}

		/**
		* @return the name
		*/
		public String getName() {
		return mName;
		}

		/**
		* @return Handler
		*/
		public Handler getHandler() {
		return mHandler;
		}

		/**
		* @return if debugging is enabled
		*/
		public boolean isDbg() {
		return mDbg;
		}

		/**
		* Set debug enable/disabled.
		*/
		public void setDbg(boolean dbg) {
		mDbg = dbg;
		if (mDbg) {
		mHandlerThread.getLooper().setMessageLogging(new LogPrinter(Log.VERBOSE, TAG));
		} else {
		mHandlerThread.getLooper().setMessageLogging(null);
		}
		}
		}

core/java/com/android/internal/util/HierarchicalState.java

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		/**
		* Copyright (C) 2009 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		package com.android.internal.util;

		import android.os.Message;

		/**
		* {@hide}
		*
		* The abstract class for implementing states in a
		* HierarchicalStateMachine and HandlerStateMachine.
		*/
		public abstract class HierarchicalState {

		/**
		* Constructor
		*/
		protected HierarchicalState() {
		}

		/**
		* Called when a state is entered.
		*/
		protected void enter() {
		}

		/**
		* Called when a message is to be processed by the
		* state machine.
		*
		* This routine is never reentered thus no synchronization
		* is needed as only one processMessage method will ever be
		* executing within a state machine at any given time. This
		* does mean that processing by this routine must be completed
		* as expeditiously as possible as no subsequent messages will
		* be processed until this routine returns.
		*
		* @param msg to process
		* @return true if processing has completed and false
		* if the parent state's processMessage should
		* be invoked.
		*/
		abstract protected boolean processMessage(Message msg);

		/**
		* Called when a state is exited.
		*/
		protected void exit() {
		}

		/**
		* @return name of state, but default returns the states
		* class name. An instance name would be better but requiring
		* it seems unnecessary.
		*/
		public String getName() {
		String name = getClass().getName();
		int lastDollar = name.lastIndexOf('$');
		return name.substring(lastDollar + 1);
		}
		}