Remove system_server classes from the boot image.

We set the system_server classpath in the environment
(like we do with BOOTCLASSPATH). After the zygote forks
the system_server, we dexopt the classpath (if needed)
and then launch the system server with the correct
PathClassLoader. This needed several small / medium
refactorings :

- The logic for connecting to installd is now in a separate
  class and belongs in the system_server.
- SystemService / SystemServiceManager have now moved to
  classes.jar. They are only used from there, and since they
  use Class.forName, we want them to be loaded by the
  system_server classloader, and not the bootclassloader.
- BootReceiver now moves to frameworks.jar, because it is
  used by ActivityThread and friends.

bug: 16555230

Change-Id: Ic84f0b2baf611eeedff6d123cb7191bb0259e600

1 files changed, 227 insertions, 0 deletions

diff --git a/services/core/java/com/android/server/SystemServiceManager.java b/services/core/java/com/android/server/SystemServiceManager.java
new file mode 100644
index 0000000..fda6479
--- /dev/null
+++ b/services/core/java/com/android/server/SystemServiceManager.java
@@ -0,0 +1,227 @@
+/*
+ * Copyright (C) 2013 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.server;
+
+import android.content.Context;
+import android.util.Slog;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.util.ArrayList;
+
+/**
+ * Manages creating, starting, and other lifecycle events of
+ * {@link com.android.server.SystemService system services}.
+ *
+ * {@hide}
+ */
+public class SystemServiceManager {
+    private static final String TAG = "SystemServiceManager";
+
+    private final Context mContext;
+    private boolean mSafeMode;
+
+    // Services that should receive lifecycle events.
+    private final ArrayList<SystemService> mServices = new ArrayList<SystemService>();
+
+    private int mCurrentPhase = -1;
+
+    public SystemServiceManager(Context context) {
+        mContext = context;
+    }
+
+    /**
+     * Starts a service by class name.
+     *
+     * @return The service instance.
+     */
+    @SuppressWarnings("unchecked")
+    public SystemService startService(String className) {
+        final Class<SystemService> serviceClass;
+        try {
+            serviceClass = (Class<SystemService>)Class.forName(className);
+        } catch (ClassNotFoundException ex) {
+            Slog.i(TAG, "Starting " + className);
+            throw new RuntimeException("Failed to create service " + className
+                    + ": service class not found, usually indicates that the caller should "
+                    + "have called PackageManager.hasSystemFeature() to check whether the "
+                    + "feature is available on this device before trying to start the "
+                    + "services that implement it", ex);
+        }
+        return startService(serviceClass);
+    }
+
+    /**
+     * Creates and starts a system service. The class must be a subclass of
+     * {@link com.android.server.SystemService}.
+     *
+     * @param serviceClass A Java class that implements the SystemService interface.
+     * @return The service instance, never null.
+     * @throws RuntimeException if the service fails to start.
+     */
+    @SuppressWarnings("unchecked")
+    public <T extends SystemService> T startService(Class<T> serviceClass) {
+        final String name = serviceClass.getName();
+        Slog.i(TAG, "Starting " + name);
+
+        // Create the service.
+        if (!SystemService.class.isAssignableFrom(serviceClass)) {
+            throw new RuntimeException("Failed to create " + name
+                    + ": service must extend " + SystemService.class.getName());
+        }
+        final T service;
+        try {
+            Constructor<T> constructor = serviceClass.getConstructor(Context.class);
+            service = constructor.newInstance(mContext);
+        } catch (InstantiationException ex) {
+            throw new RuntimeException("Failed to create service " + name
+                    + ": service could not be instantiated", ex);
+        } catch (IllegalAccessException ex) {
+            throw new RuntimeException("Failed to create service " + name
+                    + ": service must have a public constructor with a Context argument", ex);
+        } catch (NoSuchMethodException ex) {
+            throw new RuntimeException("Failed to create service " + name
+                    + ": service must have a public constructor with a Context argument", ex);
+        } catch (InvocationTargetException ex) {
+            throw new RuntimeException("Failed to create service " + name
+                    + ": service constructor threw an exception", ex);
+        }
+
+        // Register it.
+        mServices.add(service);
+
+        // Start it.
+        try {
+            service.onStart();
+        } catch (RuntimeException ex) {
+            throw new RuntimeException("Failed to start service " + name
+                    + ": onStart threw an exception", ex);
+        }
+        return service;
+    }
+
+    /**
+     * Starts the specified boot phase for all system services that have been started up to
+     * this point.
+     *
+     * @param phase The boot phase to start.
+     */
+    public void startBootPhase(final int phase) {
+        if (phase <= mCurrentPhase) {
+            throw new IllegalArgumentException("Next phase must be larger than previous");
+        }
+        mCurrentPhase = phase;
+
+        Slog.i(TAG, "Starting phase " + mCurrentPhase);
+
+        final int serviceLen = mServices.size();
+        for (int i = 0; i < serviceLen; i++) {
+            final SystemService service = mServices.get(i);
+            try {
+                service.onBootPhase(mCurrentPhase);
+            } catch (Exception ex) {
+                throw new RuntimeException("Failed to boot service "
+                        + service.getClass().getName()
+                        + ": onBootPhase threw an exception during phase "
+                        + mCurrentPhase, ex);
+            }
+        }
+    }
+
+    public void startUser(final int userHandle) {
+        final int serviceLen = mServices.size();
+        for (int i = 0; i < serviceLen; i++) {
+            final SystemService service = mServices.get(i);
+            try {
+                service.onStartUser(userHandle);
+            } catch (Exception ex) {
+                Slog.wtf(TAG, "Failure reporting start of user " + userHandle
+                        + " to service " + service.getClass().getName(), ex);
+            }
+        }
+    }
+
+    public void switchUser(final int userHandle) {
+        final int serviceLen = mServices.size();
+        for (int i = 0; i < serviceLen; i++) {
+            final SystemService service = mServices.get(i);
+            try {
+                service.onSwitchUser(userHandle);
+            } catch (Exception ex) {
+                Slog.wtf(TAG, "Failure reporting switch of user " + userHandle
+                        + " to service " + service.getClass().getName(), ex);
+            }
+        }
+    }
+
+    public void stopUser(final int userHandle) {
+        final int serviceLen = mServices.size();
+        for (int i = 0; i < serviceLen; i++) {
+            final SystemService service = mServices.get(i);
+            try {
+                service.onStopUser(userHandle);
+            } catch (Exception ex) {
+                Slog.wtf(TAG, "Failure reporting stop of user " + userHandle
+                        + " to service " + service.getClass().getName(), ex);
+            }
+        }
+    }
+
+    public void cleanupUser(final int userHandle) {
+        final int serviceLen = mServices.size();
+        for (int i = 0; i < serviceLen; i++) {
+            final SystemService service = mServices.get(i);
+            try {
+                service.onCleanupUser(userHandle);
+            } catch (Exception ex) {
+                Slog.wtf(TAG, "Failure reporting cleanup of user " + userHandle
+                        + " to service " + service.getClass().getName(), ex);
+            }
+        }
+    }
+
+    /** Sets the safe mode flag for services to query. */
+    public void setSafeMode(boolean safeMode) {
+        mSafeMode = safeMode;
+    }
+
+    /**
+     * Returns whether we are booting into safe mode.
+     * @return safe mode flag
+     */
+    public boolean isSafeMode() {
+        return mSafeMode;
+    }
+
+    /**
+     * Outputs the state of this manager to the System log.
+     */
+    public void dump() {
+        StringBuilder builder = new StringBuilder();
+        builder.append("Current phase: ").append(mCurrentPhase).append("\n");
+        builder.append("Services:\n");
+        final int startedLen = mServices.size();
+        for (int i = 0; i < startedLen; i++) {
+            final SystemService service = mServices.get(i);
+            builder.append("\t")
+                    .append(service.getClass().getSimpleName())
+                    .append("\n");
+        }
+
+        Slog.e(TAG, builder.toString());
+    }
+}